The Origin of the Universe: Reexamining the Big Bang Theory

[Entropy]

On the contrary, the burden of proof is on you. I'll humor you this time.

I'm not trying to prove it, I just claimed it might be possible.

You are either suggesting that it is only the object playing the part, and therefore objects farther away are always heavier dependant upon the distance, or you are saying there is a matter gradient evenly distributed throughout the universe.

In the first case you'll be at a loss to explain the state of stars far away. There are visible galaxies very far away which, under your theory, should have huge amounts of extra mass. Yet they contain stars who are burning rather weakly. On top of that, their rotational inertia doesen't allow for the huge amount of mass you are trying to give them. If all stars in a galaxy are redshifted, then they must all be heavier. Significantly.

As you know the redshift due to gravity with an observer away from the source is

where P_e is the gravitational potential energy.

The gravitational potential energy involved will be the the integral of the gravitational field produced by the body from the point the light is emmitted to the point it is recieved.

dr from to . We'll take to be at infinity to give you the greatest benefit of the doubt. Once you integrate and take the limit your formula will be:



Now let's take a star whose lyman alpha line has been shifted from a frequency of 25x10^12 to 8.3x10^12 (both in units of inverse seconds), which is far from the greatest shift to be seen, though it is sizable. Use a standard Sun type star that there are plenty of in the universe for your radius and you'll find that to create this red shift

M = 4x10^35, which is 100,000 times as heavy as our sun.

So in other words, to make this case that gravity is causing red shift, you are going to have to explain how everything half way to the edge of our vision is 100,000 times as heavy as everything near to us, and yet are visibly the same types of stars and do not show 100,000 times as much angular momentum.

Good luck

I won't bother with the matter gradient since you don't seem to feel matter is distributed evenly... and it's obviously just as invalid a hypothesis.

I was thinking of similar equations to the ones you have there today at school. As a small first step I planned on calculating how much red-shift a photon would experience traveling from the sun's surface to Earth. Just to get an idea of how much light is effected by a "normal" star's gravity. Unfortunately, I didn't have my physics book with me today so I wasn't able to look up the radius of the sun or the sun's mass. But I did manage to form some rough equations that would describe the lose in momentum of a photon over a distance with a decreasing gravitational pull as it travels away.

I'm only use to calculating marcoscopic objects with mass so dealing with the gravitational effects on light is new to me. But from what I've deduced so far from my equations is that the evidence seems to be tilting in your favor.

But, I'm not going to rule out that gravity couldn't in some way be effecting the way we see light. Gravity can do some strange things sometimes and with so many sources and such a vast universe there are bound to be unseen variables.

 

[Antonio Lao]

For our sake, the Big Bang is necessary. Although we can talk without any certainty about its real meaning and purpose which experts such as Hawking and Penrose remain silent and theories only reached up to the Planck time, it's a point of departure for all of us. A creationist view of reality.

On the other hand, if there was never a primeval explosion then the universe was always here and always will be here and there forever in a continuum of process without change and movement and indefinite uniformity. A steady state universe that is necessarily infinite in time and space with no change of any kind like the eternal true vacuum itself.

In actuality, the explosion can be just a change in energy density and not a change in energy and mass by themselves for the density can change with mass and energy remain constant while the volume changes.

The change of energy density gives us pressure and this pressure is equal to 2/3 of the energy density for non-relativistic velocity and is equal to 1/3 of energy density for relativistic velocity.

 

[LENIN]

Hi.

I'm sorry but I haven't manege to read the whole text yet so I might say somethings allredy told. I would just like to give a few thoughts set on the original question.

There has been qouit some talk about what was before the Big bang. But as much as I know (not much ) that is more a question of religion then of physics. So there is no need to talk about it.

But by the way I personaly don't believe in the Big bang theory. I find a therey of a nonconstent speed of light and a ever expending universe with an endles number of Big bang much easyer to believe alldo it is qouit new and not yet wiedly accepted.

 

[employee #416]

Wow, forgot about my post.

Ok, Chronos, black holes do not have a distinct visible characteristic that makes it different from any other object. How hard is that to grasp? Visible characteristics of the black hole itself are unknown. We do not know how the object inside the black hole that causes the disturbance in space-time visually looks like. How can we note this unseen-visible characterstic to be different than a visual characteristic of another object? We can only distinguish the outer region of a black hole from an outer region of a similar object.

Take a room that has a width of 50m, a height of 10m and a depth of 50m. Place two light bulbs in the room at opposite ends of the width. One light bulb is a regular house-light bulb, while the other is a standard bulb you would find in an office building (those long ones). This room is made of clear glass. It is surrounded by a bigger room that is made of material that does not let light get through. You turn one of the lights on. Let's say the common house light. You allow an observer to observe this. You tell the observer he can go to any edge of the room as long as he does not pass half the width. You tell the observer that there is another light in the room that is off. You ask him to identify how do they visually differ. He responsds "One emitts light, the other doesnt." Is that really what you want? No, you know the observer is wrong. The other bulb can emitt light if it were turned on. He did not describe the visual characteristics. I.E. the shape of the bulbs. You know that one bult is rod shaped, while the other is a bulb shape.

russ_watters, I know what a black hole is. I understand the concept. You just miscomprehend what I'm asking.

For our sake, the Big Bang is necessary.

Well, not necessarily.

 

[russ_watters]

russ_watters, I know what a black hole is. I understand the concept. You just miscomprehend what I'm asking.

Sorry, but you don't. Your analogy shows this quite clearly:

You ask him to identify how do they visually differ. He responsds "One emitts light, the other doesnt." Is that really what you want? No, you know the observer is wrong. The other bulb can emitt light if it were turned on.

How do you know the other bulb can emit light? Maybe its burned out? Maybe its not connected to the switch? Indeed, in this case, the only thing the guy knows is that one emits light and one doesn't. This is exactly the issue with a black hole vs a star at the same mass. A black hole doesn't emit light and can't. You make the assumption that there is more information that could be collected that would show them to have the same characteristics. In the case of a black hole, there isn't (in the case of your light bulb, it might, but you have assumed it without evidence). Continuing:

He did not describe the visual characteristics. I.E. the shape of the bulbs. You know that one bult is rod shaped, while the other is a bulb shape.

One thing for sure - a black hole is smaller than a neutron star. Other than that, we don't know - it could be a singularity, or it might not be. But you are assuming structure that may not exist. You can't do that. At the moment, iirc, there are only 3 known basic properties of black holes: mass, spin, and charge (density is high but unknown). But that doesn't matter - we can still distinguish it from the neutron star.

So let me ask you this: if a black hole and neutron star of identical mass had identical structure (as you appear to be implying), why would one have an event horizon and one not?

 

[north]

I haven't seen that paper of Halton Arp but I do remember some of his comments about problems with the Big Bang. If what Arp says in the quote above is true it may provide a way to test the red shift. Red shift due to doppler should have all frequencies shifted the same. Red shift due to Arp's assertion should be shifted less in the red frequencies than in the blue.

Does that sound right ?

Vern

___________________________________________

no,its just there is a different reason for the shift and if you are interested in the book, with enormous amount of his evidence is "SEEING RED" can be purchased at (isbn #0-9683689-0-5) at infinite-energy.com or <http:// metaresearch.org>.perhaps even a book store,not sure, very good read, although very tech. if anything it gives a different perspective of the understanding of what's going on,which to me is important so we don't get stuck in certain way of thinking,which seems to be happening.but be critical of his book, that is also important.

 

[north]

I don't really believe in an expanding universe, or atleast one that is accelerating outward and will continue to do for eternity.

It is possible that the red-shift isn't cause only (or maybe even at all) by the Doopler effect. There are other ways red-shifts can occur, such as gravitational red-shift.

Personally I think any serious speculations on the what the universe was like in near the beginning or will be like near the end is very bold. We know so little about what is happening in the cosmos that it would be stupid at this point in time to devote your life souly (or even a good portion of time) trying to proving a theory describing the beginning and end of the universe. With our current knowledge, making a hardcore theory about the universe would be like determaining the ultimate fate of all mankind after studying one person's life for one minute.

___________________________________________

couldn't agree more,but that is exactly what's going on. that's why to me looking at other theories is important,there are many out there and it can be confusing but if you give yourself time,you'll sort it out at least to yourself,flexibility of mind is important but always criticize.

 

[brodix]

Chronos,

Gravitational redshift is only relevant to the emission source. Light passing through a gravity field would first be blue shifted [incoming], then red shifted [outgoing]. The net effect is zero.

Why do gravitational fields serve as magnifying lenses for distant light sources? What would be the lensing effect on the lightwaves?

One of the primary alternative theories for redshift was tired light, that it was simply encountering friction. As the light wasn't scattered, this idea was rejected. Frankly, I don't think it made much sense to begin with. Obviously proceeding waves would encounter more friction than succeeding ones, so the logical result would be blueshift.
What about energized light; That as amplitude decreases, frequency expands, much like a cracking whip. This would explain why light only travels so far before it fades out.
The first time I questioned the Big Bang theory was reading Stephen Hawking's A Brief History of Time and he made the point that for the universe to be as stable as it is, "Omega =1". In other words, the gravitational collapse of space must be in inverse proportion to the expansion of the universe. It struck me that a cyclical equilibrium between these two actions would be far more logical than the convenient coincidence of Big Bang Theory. Tests of the CMBR have since proven that this balance does exist and that ultimately space is flat.
Einstein proposed that the gravitational collapse of mass causes space to collapse. The fact is that this process releases tremendous amounts of radiation. Why doesn't this radiation result in the expansion of space? This is a point that I've heard raised by others.
An interesting article;
http://www.economist.com/science/displayStory.cfm?story_id=2404626

What if space does expand, but the universe doesn't? This would result in additional pressure on gravitational collapse. Exactly the effect currently assigned to dark matter.

It is a given that light passing through gravitational fields is magnified by a lensing effect and this is how we observe some of the most distant sources. What if this results in a blue shift? When you consider the distribution of galaxies across the universe, the further light travels, the more residual gravity fields it will cross. The resulting blueshift would reduce the overall redshift of distant sources, so the closer sources would have a greater average redshift. This creates the impression that the rate of expansion is increasing. Which would explain the effect assigned to dark energy.
Much is made of the CMBR as being predicted by BBT, but could there be other reasons for it. One of the problems it posed for BBT was that it was so smooth that information would have to travel at twice the speed of light for opposite sides of the universe to be similar.
Well, we have expanding energy/radiation and collapsing mass. Where is the connection? Could it be that empty space can only hold a minor amount of radiation in solution before it starts to condense out? Say this phase transition level is 2.7k(much like 32f is the freezing point of water) After this it starts to condense out as hydrogen.
What is the other side of the cycle? Gravitational vortexes of collapsing matter and radiating energy. Rather then black holes being some infinitely dense mass, or some hole into another dimension, what if they are essentially the eye of the storm, with most of the activity being what we see, much like a hurricane swirling around its center? Some energy does fall in, but this could be the source of the jets of protons shooting out the poles. So the matter is turned back into energy.

Of course, the experts say the universe and time and space, began in an instant, some 15 billion years ago, necessarily expanded faster then the speed of light to a size far greater than the visible universe and is ninety six percent invisible to everything but the math.
I suppose so, but I'm not going to hire any cosmologists as my accountants, just to be on the safe side.

 

[Chronos]

Gravitational lensing bends light, it does not red, or blue, shift it. It works pretty much the same as an optical lense.

 

[Chronos]

Wow, forgot about my post.

Ok, Chronos, black holes do not have a distinct visible characteristic that makes it different from any other object. How hard is that to grasp?

They have characteristics that are not visible. That is the part that cannot be explained by any other explanation than they are black holes.

Visible characteristics of the black hole itself are unknown.

Agreed, a black hole has no visible characteristics. That is why we suspect they exist.

We do not know how the object inside the black hole that causes the disturbance in space-time visually looks like.

Agreed.

How can we note this unseen-visible characterstic to be different than a visual characteristic of another object? We can only distinguish the outer region of a black hole from an outer region of a similar object.

Any other object would have observable characteristics.

Take a room that has a width of 50m, a height of 10m and a depth of 50m. Place two light bulbs in the room at opposite ends of the width. One light bulb is a regular house-light bulb, while the other is a standard bulb you would find in an office building (those long ones). This room is made of clear glass. It is surrounded by a bigger room that is made of material that does not let light get through. You turn one of the lights on. Let's say the common house light. You allow an observer to observe this. You tell the observer he can go to any edge of the room as long as he does not pass half the width. You tell the observer that there is another light in the room that is off. You ask him to identify how do they visually differ. He responsds "One emitts light, the other doesnt." Is that really what you want? No, you know the observer is wrong.

The observer is correct.

The other bulb can emitt light if it were turned on. He did not describe the visual characteristics. I.E. the shape of the bulbs. You know that one bult is rod shaped, while the other is a bulb shape.

Irrelevant.

russ_watters, I know what a black hole is. I understand the concept. You just miscomprehend what I'm asking.

Russ is correct, you are incorrect. Do the math and you will see Russ is correct. Do not trust your intuition. Relativity does not obey it. Seriously, look at the math. Relativity is very hard conceptually. As Eddington said years ago.. 'Who is the third person who understands it?'

 

[Vern]

I haven't seen where the graviton, if it exists, is imune to gravity itselt. No other thing in the universe is imune to gratitational effects, how did the gravaton manage?

If the graviton is not imune to gravity, you could never have a complete black hole, just almost, almost, almost, like continously getting half way there.

Vern

 

[C. Michael Turner]

Here is your answer. All matter is Bound gravitation. e=mc2 is really stating that free gravity, the wave, = Bound gravity, mass times the speed of the wave, light; squared.
All matter is a mass to energy transfer from a point of origin in wave form. This creates three actions. Time, space, and Gravitational wave sychronization. It also explains how time and space are relative and it explains why since the big bang matter is accelerating.F=ma If force is constant and mass is decreasing as it decays creating space then acceleration increases. Hope this helps! go to www.photontheory.com and click on papers- Dr. Turner's Universe for the long version.

 

[C. Michael Turner]

Black hole evaporation and gravitons: Black holes are colasped matter decaying into gravitational waves which are like a monopole magnet. Some of the waves are so dense that they reform matter- see Stephen Hawking's latest press release and the rest is given off as microwave radiation and gravity waves( Monopolar gravitons) Mass is brought together be sychronization of waves throught the path of least resistance- therefore gravitons would never effect themselves except when they form matter under extreme heat and pressure.

 

[brodix]

Chronos,

Gravitational lensing bends light, it does not red, or blue, shift it. It works pretty much the same as an optical lense.

Yes, it bends it. That's why there are Eisteinian rings, etc., but it also magnifies it. That is why some of the most distant objects are able to be seen.

(I wish I kept the track of the article, it was about a year ago and it said that logically you are right, but in fact the effect I mention does happen, they just haven't explained it fully. I realize this needs backing, but I don't have enough time to keep track of what I need too...)

 

[brodix]

Chronos,

After googling this up one side and down the other, I have to give you this one...for the moment.

 

[employee #416]

russ_watters, my point with that analogy was to point out that you are unable to visualize a black hole just as you are not able to visualize a light bulb that is not emitting light. You can not give characteristics of the light bulb that is not lit and the light bulb that is lit. You can not differentiate the two based on physical characterstics.

But you are assuming structure that may not exist.

I'm the only person who assumes things that do not exist?

So let me ask you this: if a black hole and neutron star of identical mass had identical structure (as you appear to be implying), why would one have an event horizon and one not?

It seems that yet again your miscomprehension has lead to false questioning. When I said identical structures, I meant that a black hole and neutron star could be very similar. The would BOTH have an event horizon. For they would BOTH allow light to fall in and not escape.

event horizon n. - The region, usually described as spherical, marking the outer boundary of a black hole, inside which the gravitational force is strong enough to prevent matter or radiation from escaping.

Please clarify what you mean by an event horizon. Going by that definition everything has an event horizon. An event horizon is dictated by mass OR EM not being *able* to escape.

Gravitational lensing bends light, it does not red, or blue, shift it. It works pretty much the same as an optical lense.

This bending of light causes shift. When light is bent at an angle, it accelerates towards a center. As you know through 1st year physics, when something turns, it has to accelerate towards a center. So, to keep light's velocity constant, it has to shift frequencies.

C. Michael Turner, I like your theory on how gravity works. It's consistent to what I think, but I describe it by different means. Oh well.

 

[russ_watters]

russ_watters, my point with that analogy was to point out that you are unable to visualize a black hole just as you are not able to visualize a light bulb that is not emitting light. You can not give characteristics of the light bulb that is not lit and the light bulb that is lit. You can not differentiate the two based on physical characterstics.

And clearly, you are wrong: there clearly is a difference between the two light bulbs: one is emitting light and one isn't. One has a higher temperature than the other. One is consuming more energy than the other. I won't assume that the one that isn't lit can't light, but similarly, you cannot assume that it can light.

I'm the only person who assumes things that do not exist?

Yep. You are assuming that a black hole has properties similar to a neutron star even though they are not observed and vice versa. You are attaching properties to both black holes and neutron stars that you want them to have, but that they do not, and cannot have.

It seems that yet again your miscomprehension has lead to false questioning. When I said identical structures, I meant that a black hole and neutron star could be very similar. The would BOTH have an event horizon. For they would BOTH allow light to fall in and not escape.

And again, I say, do the math and collect your Nobel prize: current theory says a neutron star is not dense enough to have an event horizon.

Please clarify what you mean by an event horizon. Going by that definition everything has an event horizon. An event horizon is dictated by mass OR EM not being *able* to escape.

An event horizon is the distance at which the escape velocity is greater than C. If every object were a point mass, then every object would have an event horizon. But you can't use that oversimplification here. Otherwise, you could dig down toward the core of Earth and reach a place where the escape velocity is greater than C. But you can't: such a place does not exist.

This bending of light causes shift. When light is bent at an angle, it accelerates towards a center. As you know through 1st year physics, when something turns, it has to accelerate towards a center. So, to keep light's velocity constant, it has to shift frequencies.

No, in that case, it changes direction. Not frequency.

 

[employee #416]

You are unably to visually declare a difference between the two light bulbs. You can not say "one is shaped different". You can not say "one has a greater volume than the other," nor can you say "one weighs more than the other."

Yep. You are assuming that a black hole has properties similar to a neutron star even though they are not observed. You are attaching properties to both black holes and neutron stars that you want them to have, but that they do not, and cannot have.

I'm not the only one. Science, as a whole, assumes things that have yet been proven to exist. My claims of neutron stars and black holes having the same properties is a CASE SCENARIO. For all you know, I could have said those two light bulbs were the exact same ones, but the observer does not know that.

. Otherwise, you could dig down toward the core of Earth and reach a place where the escape velocity is greater than C. But you can't: such a place does not exist.

Density is what holds that claim as false. I'll agree with you on that one. If Earth were much dense, then finding one point mass at the center could have an escape velocity greater than that of light.

No, in that case, it changes direction. Not frequency.

In order to change direction, you have to apply an acceleration. Your velocity increase. Light has to stay constant, so a shift in frequency must take place. I'm sure you are aware of how centripetal force works. It's just the bending of an objects curved path towards a center. A constant accelerated force is applied to keep that curved path bent.

 

[russ_watters]

You can not say "one is shaped different". You can not say "one has a greater volume than the other," nor can you say "one weighs more than the other."

Quite right: but you can say that one is hotter than the other. You can say one is brighter than the other.

You are unably to visually declare a difference between the two light bulbs.

Isn't brightness a property? Isn't temperature a property?

I'm not the only one. Science, as a whole, assumes things that have yet been proven to exist.

Sorry, that's not how the scientific method works. I guess you're claiming this about black holes, but black holes were predicted through mathematical derivation, then found through observation of the predicted properties. Assumption doesn't play a part here.

My claims of neutron stars and black holes having the same properties is a CASE SCENARIO.

? That doesn't alleviate the need for you to either prove it observationally or derive it mathematically.

Density is what holds that claim as false. I'll agree with you on that one. If Earth were much dense, then finding one point mass at the center could have an escape velocity greater than that of light.

So extend that to neutron stars: are they dense enough at any mass to have an event horizon?

In order to change direction, you have to apply an acceleration. Your velocity increase.

That's not how velocity works. Velocity is a scalar speed and a vector direction. An acceleration can be either a change in direction or a change in speed. A satellite in orbit, for example, has constant scalar speed even with constant acceleration. If your assertion were correct, satellites would have constantly increasing (or decreasing) energy due to ther acceleration. They don't.

 

[employee #416]

Quite right: but you can say that one is hotter than the other. You can say one is brighter than the other.

Not really. For all we know, a black hole can be one of the brightest objects in the universe, but we are not able to dictate that, because no light has been observed coming from a black hole. We can not say one is hotter than the other, but we can say the gases that are being accelerated can have a hot temperature which can account for the X-ray being emitted.

Isn't brightness a property? Isn't temperature a property?

Yes, they are, but we are unable to judge the two by those.

That's not how velocity works. Velocity is a scalar speed and a vector direction. An acceleration can be either a change in direction or a change in speed. A satellite in orbit, for example, has constant scalar speed even with constant acceleration. If your assertion were correct, satellites would have constantly increasing (or decreasing) energy due to ther acceleration. They don't.

When a satelite is in orbit, it is constantly being pulled towards a center of mass. This gives it direction change a and velocity change.

 

[Chronos]

Originally Posted by russ_watters...Quite right: but you can say that one is hotter than the other. You can say one is brighter than the other.

Not really. For all we know, a black hole can be one of the brightest objects in the universe

Not really? The black hole radiates nothing. Matter swirling into a black hole is a separate issue.

Originally Posted by russ_watters
Isn't brightness a property? Isn't temperature a property?.

Yes, they are, but we are unable to judge the two by those.

You appear to conveniently ignore observational evidence that refutes your flawed assumptions. Have you actually read past the part where we disagree with you? We give observational evidence and you give excuses.

Posted by russ_watters
That's not how velocity works. Velocity is a scalar speed and a vector direction. An acceleration can be either a change in direction or a change in speed. A satellite in orbit, for example, has constant scalar speed even with constant acceleration. If your assertion were correct, satellites would have constantly increasing (or decreasing) energy due to ther acceleration. They don't.

When a satelite is in orbit, it is constantly being pulled towards a center of mass. This gives it direction change a and velocity change.

This is a patently transparent attempt to ignore your original, erroneous assertion by pretending we misunderstood what you were trying to say.

 

[Antonio Lao]

The black hole radiates nothing.

Aren't you forgetting Hawking radiation?

 

[russ_watters]

Not really. For all we know, a black hole can be one of the brightest objects in the universe, but we are not able to dictate that, because no light has been observed coming from a black hole. We can not say one is hotter than the other,

I was talking about the light bulb, but in any case, that is an incorrect understanding of how black holes (and light itself) work. Its a logical contradiction to say that something that emits no light can be "bright."

...but we can say the gases that are being accelerated can have a hot temperature which can account for the X-ray being emitted.

That's how you calculate mass.

Yes, they are, but we are unable to judge the two by those.

What? Now you are saying we can measure properties that are different, but these properties aren't important?

When a satelite is in orbit, it is constantly being pulled towards a center of mass. This gives it direction change a and velocity change.

Yes it does. So complete it: does its velocity increase, decrease or stay the same?

employee #416, before I was seeing misunderstanding. Now I'm seeing what looks like intentional evasion. I think you see the problem you have with countering certain points and that's why you are ignoring some and evading others. And many of the ones you are answering - the things you are saying are just plain absourd. Think about them, please. Especially this question I asked before:

...are they [neutron stars] dense enough at any mass to have an event horizon?

Don't throw away a chance to learn in favor of intellectual dishonesty because of pride.

Aren't you forgetting Hawking radiation?

No, I would say Chronos and I are simplifying. employee #416 is nowhere near ready for that and its different from the radiation we are talking about.

 

[employee #416]

Not really? The black hole radiates nothing. Matter swirling into a black hole is a separate issue.

I think you missed the reasoning behind my response.

You appear to conveniently ignore observational evidence that refutes your flawed assumptions. Have you actually read past the part where we disagree with you? We give observational evidence and you give excuses.

Temperature and brightness are not observational evidences of the black hole itself. They are just measures of the outer region (event horizon). Observational evidence of the actually singularity (string if you are into the M-theory) has not been observed. So, don't give me this crap about observational evidence.

This is a patently transparent attempt to ignore your original, erroneous assertion by pretending we misunderstood what you were trying to say.

Eh? Not all orbits are complete circulars. Most are elliptical. When the object is orbiting and is going towards the farthest point it has to deccelerate and accelerate in a new direction. This involves velocity change.

I was talking about the light bulb, but in any case, that is an incorrect understanding of how black holes (and light itself) work. Its a logical contradiction to say that something that emits no light can be "bright."

Not really a contradiction as you say. We do not know what's going on past the event horizon as far as light. We have never observed inside of a black hole. Light enters the black hole, but does not escape. The light that is inside could very well give the black hole color, but we are unsure of that.

What? Now you are saying we can measure properties that are different, but these properties aren't important?

No, I'm saying that temperature and brightness are unknown for a black hole, ergo you are unable to use those two properties to differentiate from a black hole and another object.

...are they [neutron stars] dense enough at any mass to have an event horizon?

Ok, I'm not sure if I've said this, but here it is again: Neutron stars and black holes are the SAME thing. One is just more dense than the other. To answer you question: Yes, they are dense enough at any mass to have an event horizon. Neutron stars and black holes have the same mass upon collapsing. Black hole is just another way of saying "a neutron star that is dense enough to not allow light to escape."

 

[employee #416]

Aren't you forgetting Hawking radiation?

Hawkings radiation is not what I'm explaining. Black holes do not emit anything. The Hawking's radiation is just the particle/anti-particle pairing at the event horizon, where one of the two will fall in, while the other doesn't. That is not the black hole emitting anything.

 

[russ_watters]

Observational evidence of the actually singularity (string if you are into the M-theory) has not been observed. So, don't give me this crap about observational evidence.

Indeed, scientists aren't convinced there even is a singularity. But that doesn't change the fact that there is an event horizon and by definition, a black hole. Anyway, if you can prove that the singularity doesn't exist, please do - and then go pick up your Nobel prize: Hawking will be jealous.

Eh? Not all orbits are complete circulars. Most are elliptical. When the object is orbiting and is going towards the farthest point it has to deccelerate and accelerate in a new direction. This involves velocity change.

That's also a transparent evasion: in a circular orbit, there is a constant acceleration - as you said before. Now you're changing the argument because you have no answer to my question from the last post: is the velocity of an object in a circular orbit increasing or decreasing?

Not really a contradiction as you say. We do not know what's going on past the event horizon as far as light. We have never observed inside of a black hole. Light enters the black hole, but does not escape. The light that is inside could very well give the black hole color, but we are unsure of that.

This implies that what goes on inside a black hole could be relatively "normal," and that the event horizon is some sort of opaque barrier: its a clear indication you don't understand how a black hole works: namely, what gravitational redshift does in/just outside of a black hole.

No, I'm saying that temperature and brightness are unknown for a black hole, ergo you are unable to use those two properties to differentiate from a black hole and another object.

Another misunderstanding of what black holes are: brightness has a value: ZERO. Temperature quite simply doesn't exist.

Ok, I'm not sure if I've said this, but here it is again: Neutron stars and black holes are the SAME thing. One is just more dense than the other.

They are the same except where they are different? Thats a contradiction: If they were the same, they'd be the same [density]. That's like saying a red giant and white dwarf are the same thing, just different density. Red and blue are the same color, just different. Rough is the same as smooth, just rougher. Apparently you don't understand what a neutron star is either - though your assertion is so absurd I have a hard time accepting you don't see it. In any case, you can't just assert it. Like I've said now a good half dozen times you must prove it.

To answer you question: Yes, they are dense enough at any mass to have an event horizon. Neutron stars and black holes have the same mass upon collapsing. Black hole is just another way of saying "a neutron star that is dense enough to not allow light to escape."

That's another contradiction: if a neutron star collapses into a black hole its not a neutron star anymore. Neutron stars have specific densities based on the force that holds the nucleus of an atom together. What I am asking is can a neutron star - a star with that specific structure - ever acquire enough mass to get an event horizon while still retaining its structure? If you believe it can, prove it.

Also, I shouldn't need to say this again, but a black hole is, by definition, "An area of space-time with a gravitational field so intense that its escape velocity is equal to or exceeds the speed of light." (dictionary.com) Even if it had some unknown internal structure of any kind, it would still, by definition, be a black hole. That said, one internal structure it could not have is the structure of a neutron star: neutron stars are not dense enough to have event horizons.

 

[employee #416]

Indeed, scientists aren't convinced there even is a singularity. But that doesn't change the fact that there is an event horizon and by definition, a black hole. Anyway, if you can prove that the singularity doesn't exist, please do - and then go pick up your Nobel prize: Hawking will be jealous.

I was not saying that singularities do not exists. You are good at twisting stuff around. I was simply using that to tell you that observational evidences don't mean anything.

That's also a transparent evasion: in a circular orbit, there is a constant acceleration - as you said before. Now you're changing the argument because you have no answer to my question from the last post: is the velocity of an object in a circular orbit increasing or decreasing?

To tell you the truth, I'm quite unsure of how to answer that. I'm thinking the velocity itself is constant, which would make acceleration 0. Most orbits are eccentric though, giving them the property of varying acceleration.

This implies that what goes on inside a black hole could be relatively "normal," and that the event horizon is some sort of opaque barrier: its a clear indication you don't understand how a black hole works: namely, what gravitational redshift does in/just outside of a black hole.

Gravitational redshift outside of a black hole? Gravitational shift inside a black hole? How can those be observed? I know what gravitational redshift is. With the gravity as intense as it is around a black hole, redshift can not be observed.

Another misunderstanding of what black holes are: brightness has a value: ZERO. Temperature quite simply doesn't exist.

Give me a source that states inside a black hole, there is no brightness. I'll be happy. So, now, you are saying temperature isn't a property of a black hole? Earlier you were saying it was, well, you were asking me if it was.

They are the same except where they are different? Thats a contradiction: If they were the same, they'd be the same [density]. That's like saying a red giant and white dwarf are the same thing, just different density. Red and blue are the same color, just different. Rough is the same as smooth, just rougher.

Well, what do you know. I actually agree with you on everything that was stated in that quote. Everything that seems to be different is actually the same. We just need different names to account for some differences between the two. You can make a red giant a white dwarf; you can make red look like blue; you can make rough smooth. You can make a black hole a neutron star and vice versa.

What I am asking is can a neutron star - a star with that specific structure - ever acquire enough mass to get an event horizon while still retaining its structure?

May I ask you a question to verify something, before answering?

I know that you think my knowledge on black holes is fairly limited. I assure I have read sites that are very good at describing black holes. I'm talking #1 search on google. Not only that, but I've read books on black holes, so please, do not think I'm limited in knowledge. I'm just thinking outside of the box.

 

[russ_watters]

I'm amazed (and a little disappointed) this thread survived the purge. But I'm finished with it anyway.

employee #416, you stated in another thread you disagree with the definition of a black hole. Your arbitrary discomfort does not constitute a scientific argument and not accepting a definition means you won't ever accept the concept that the definition is describing. Therefore, discussion is utterly pointless.

Add to this your continued evasion of the orbit/velocity issue and I feel you are not debating honestly or making an honest effort to learn.

This board exists to help teach people (including the moderators) science. Take a step back and consider why you are here.