# The speed of time

The_oMeGa
Read the other one this is messed up

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The_oMeGa
Time is an invention of man simply to calculate night day and when Earth makes it around the sun, right?

Not according to Einstein.
Einstein proposed that time was relative. He said that the speed of light was the only constant in the universe and that time depended on the position and velocity of an object. His idea was that the speed of light was the only universal absolute, and nothing could exceed that speed; that to go the speed of light time would have to slow down.
The conflict of this, however, is that Einstein said that for an object to travel the speed of light time must slow down (Because, of course, velocity is distance divided by time). This would mean that time need not slow down for any mass in motion until it comes upon the speed of light; this would contradict the idea of a man walking would age less than a man sitting. Since the latter was proven we must assume that this theory is true, not to disprove the light theory, but my idea is that Einstein didn't quite take that idea to the full extreme.
The fourth dimension is time. Imagine time as a platform that is pushing you forward at the speed of light. You and your friends each have their own "platform". You would arrive about 670,000,000 miles away in exactly 1 hour. But say you walk at a speed of 10 miles per hour on your platform. You would exceed the speed of light by 10 mph, but if einstein was correct in saying that the speed of light cannot be exceeded, then time would be forced to slow down. You would arrive at the same place at the same time as your friends on their platforms, but time would have slowed for you.
Still again, as the pattern goes on, what if you started running at the speed of light on your platform. To keep you from exceeding the speed of light, wouldn't time be forced to "stop"?

While this theory is of course yet to be proven, it does propose that time, although relative to the observer, is constant to the universe.

Staff Emeritus
Gold Member
Originally posted by The_oMeGa
He said that the speed of light was the only constant in the universe

Well, you're getting the idea. He said that C is a constant but not the only constant. He says nothing about what happens if one could get to C, only what happens as we approach this apparent speed limit. You need to do some more reading but you're starting to get it.

If you take a look at the Topic, "Time Dilation" in the Physics Forum, you'll find a paraphrase of Brian Greene's description of this phenomenon. Basically, it says that the total volocity of any thing is c, and that under normal circumstances, most of this volocity is dedicated to progress through time. However, as you have stated, any movement through one of the other dimensions is subtracted from forward progress through time.

totoro
speed of time

i have a few idea on this...first i think speed of time is a new idea that is worth to be consider.

why our time slow down when we are moving( no matter what speed)? IMO, because time need to chase us. the rate of time that flow from 0 to 1 second is the same for stars far away if they speed is the same to Earth speed. when you approaching the speed of light, time need to chase you, that's why you know that your time become slower compare to an observer in earth.
when you enter a room, you see everythings didn't move(man standing still,water stop in the air, etc) then you said that the time in the room has stop. but does it really? just because things didn't move in space doesn't mean the time have stop. from here we can know the relationship of spacetime.IMO time is more than its definition, time is a space(still thinking,sorry).

You know, although I have read that the speed of time may be an illusion, I still get the notion that it may have a speed. Can't the rate of entropy increasing be measured? Or does it not make sense to say that time has speed? Because time allows for speed, both speed and time would be intertwined(sp?)...

One shall be careful trying to associate time with dimension. Dimension is freedom to move, but there is not much freedom to move in time (say, nothing can go back and forth in time). So time is a coordinate, not a dimension.

(That is why tiny "i" in front of it in all SR, GR and QM equations when you try to mix it with space - to distinguish it from spatial coordinates which ARE the dimensions (degrees of freedom) we know.)

The_oMeGa
Totoro, thank you for your efforts, but i didnt understand a damn thing you said.

So alexander, you don't believe that Einstein was correct in saying time is relative? It's just a coordinate, never changing? What if, like i said, you were going the speed of light, and you accelerated to C + 10 mph. Time would be forced to slow down 10mph/C of a second in order for you not to exceed the speed of light. In your vision, you would be going C + 10, but when you looked at your watch, it would be going (at such minute speeds over C it wouldn't be noticed to the "naked" eye) slightly slower. This is to mathmatically compensate for your excess speeds.

Y = 1 year

1 light year = C + 10 mph
(10mph/C * Y) + Y

*Because Distance/Time = Velocity

Therefore time would have slowed 10/C for as long as you were traveling at that velocity.

PS try to keep the physics terms simple LOL haven't had physics, 10th grade.

Stranger
The fourth dimension is time. Imagine time as a platform that is pushing you forward at the speed of light.

So...are you taking time as a spatial dimension...

Staff Emeritus
Gold Member
Dimension is freedom to move

No... dimension is the number of linearly independant directions.

That is why tiny "i" in front of it in all SR, GR and QM equations

What i? The only way time is distinguished in SR and GR is from the signature of the metric, which is chosen to agree with reality, not because time really isn't a dimension and we're fudging the mathematics to make it look like a dimension.

The_oMeGa
Hmm...dont know what i was thinking there...i don't think it is a spatial dimension...I did not mean for time to be thought of as the "platform". The "platform" i was talking about would be massive.

But i do believe that time is more of a "free" dimension than the coordinate idea we associate it with. I believe there is[I/] freedom to move in time, we have just not reached (and may never reach) the point at which it varies. Which does contradict a "proven" theory in a way, by saying it doesn't vary until it reaches the speed of light.

I think that time is relative to speed(and of course to the observer). I think time varies inversley with Speed

Greetings !

Since Newton at least (I think) time was
considered to be a parameter that discribes
the rate of occurance of physical processes.
SR was formed by combining the constancy of
the speed of light (c) with the above assumption -
simply applying it. That is also the way time
is perceived today.

Live long and prosper.

The_oMeGa
So my whole theory is nothing new?

Greetings The_oMeGa !
Originally posted by The_oMeGa
So my whole theory is nothing new?
I still do not understand what that theory is.

Just think of time as a clock. Everything and
everyone has it and the clock makes certain
all the laws of physics stay the same for
that thing/person. Why would someone
consider it to be a dimension ? Because
a dimension is some continuum - like the
real line R in math. Now we have spacial
dimensions that discribe the relative
position of an object to us and we have
the time dimension to discribe the relative
point in time of an object.

Now, before relativity we thought everything
is simultaneous and the time was the same
for every object. But, this is wrong and
in fact unintuative when you consider it
a bit more and when you know light has
a limmited velocity. For example, if I send
a spaceship to a certain galaxy and the
cute alien in that galaxy knows emmidiately
it's coming because he can see it - there's
no need for some different time for him relative
to me. But, if light and every other interaction
is limmited to c and less he will only see
the spaceship departing millions of years later -
thus he has a different time value for this event
relative to me.

A usefull term to discribe this is a "light cone".
Basicly, I consider an event to be a definite
point in space-time (definite space and time values)
relative to me, then time is the line passing
through that point and the center of a 2D (for
a simple example) cone and the growing weidth
of the cone are the spatial dimensions - volume value,
with the relation between these two parameters
defined by c - the speed of light (the limmit
for the speed of any interaction spreading in
space). Thus I get a light cone for my event.

For my space-time coordinates I get a certain
sequence of light cones - events. But, for
a different observer the sequence may be different
depending on his relative (to me) motion through
space-time.

Live long and prosper.

sheldon
C=T=G all the same.

The_oMeGa
Basically, this is my theory:

Time is relative to the observer, and varies inversley with the speed of the observer but only when the observer has reached the speed of light.

Say you are going at the speed of C and you increase your speed by 10Mph. If Einstein was correct in saying that C is the universal speed "limit", then time will be forced to slow down 10/C of a second to mathmatically (Distance/time = Velocity) compensate for this.

This is fairly simple, which is why I asked if it had been stated before.

sheldon
This is my personal thoughts on the subject, The speed of light is the time barrier. The reason light seems to be constant at that speed is because the photons that do manage to increase to C+10 break the time barrier. I think this barrier is the same for Gravity, light, and Time. What I do not understand is why. Why is 186000 mps a constant for these things? What happens after that velocity? time travel, dementional travel, disintigration, etc. I imagine if you were in a ship and you broke the speed of light you would see flashes of light, similar to a sonic boom from a jet. They use to believe that the sound barrier could not be broken and that something weird would happen. Consider this if you are in a ship and traveling at the speed of light and you decide to go 10 mph faster a flash of light happens and the ship you see has already past you a year ago but your just now seeing it or something along thoughs lines. You are traveling at c+10mph and just get there or wherever just a little faster than c. No hocus pocus about it.

Time is relative to the observer, and varies inversley with the speed of the observer but only when the observer has reached the speed of light.

Can you expand on how 'inversely' time varies?

then time is the line passing
through that point and the center of a 2D (for
a simple example) cone and the growing weidth
of the cone are the spatial dimensions

A line, drag? A line describes a 2D surface...but then you said you used 2D for simplicity. But, you also included a 3 demensional figure, a cone into the example, so now I'm a little bewildered.

Originally posted by Hurkyl
No... dimension is the number of linearly independant directions.

Is time a direction?

If you think so, then how about energy, or mass, or temperature?

What i? The only way time is distinguished in SR and GR is from the signature of the metric, which is chosen to agree with reality, not because time really isn't a dimension and we're fudging the mathematics to make it look like a dimension.

That is exactly what we do (fudging the mathematics for our convinience). Because math is strictly logic, it shows us that time and space don't mix, forcing us to separate them by i=(-1)0.5

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Greetings !
Originally posted by Alexander
Is time a direction?

If you think so, then how about energy, or
mass, or temperature?
Isn't time supposed to be a vector, not a scalar ?
Originally posted by MajinVegeta
A line, drag? A line describes a 2D surface...
but then you said you used 2D for simplicity.
But, you also included a 3 demensional figure,
a cone into the example, so now I'm a little
bewildered.
It's not really a cone if it's 2D, you're right.
I used a 2D example to simplify my discription.
The weidth represents volume - 3 spatial dimensions.
The other perpendicular axis is time, of course.
So, the volume - V = (2 * c * t)^3 .

Live long and prosper.

The_oMeGa
BTW, my old theory is total bs haha...do the math i set up its backwards lol...i revised it and its a lil better, but completely contradicts my old one so...

Staff Emeritus
Gold Member
Is time a direction?

Nope. Neither is space or position.

That is exactly what we do (fudging the mathematics for our convinience). Because math is strictly logic, it shows us that time and space don't mix, forcing us to separate them by i=(-1)0.5

Do left and right mix?

sheldon
I think of time as a place. I am going to meet you on the corner of 5th and 10th at 9:00pm. If I am not there on time we do not meet. This is what gives it a dimensional quality. The relativity could be explained like this, if your traveling across two poles that have lights on them and when you reach the exact middle the lights turn on, which light do you see first? The light is traveling at the same speed, (186000 mps) you would see the light of the pole your traveling towards first because you are traveling towards that time point and away from the other time point. If you were not moving at all and in the center you would see both at the same time. Time is truly relative to your velocity.

Time obviousely is not a dimension, but a coordinate. Dimension is defined as a degree of freedom to move back and forth in, but how to move back and forth in time?

Also, time is scalar value (can be positive or negative, but does not have direction). So is each dimension of space. To be a vector, you need at least 2 numbers. A bunch of spatial coordinates, or space and time coordinate(s) can be considered a vector (if it has at least 2 quantities).

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quote:
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Is time a direction?
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Nope. Neither is space or position.

Time is the direction of the increasing of entropy.

Originally posted by sheldon
I think of time as a place. I am going to meet you on the corner of 5th and 10th at 9:00pm. If I am not there on time we do not meet. This is what gives it a dimensional quality. The relativity could be explained like this, if your traveling across two poles that have lights on them and when you reach the exact middle the lights turn on, which light do you see first? The light is traveling at the same speed, (186000 mps) you would see the light of the pole your traveling towards first because you are traveling towards that time point and away from the other time point. If you were not moving at all and in the center you would see both at the same time. Time is truly relative to your velocity.

Yes, time could be viewed as a coordinate that specifies a when something existed/occured.

Originally posted by Alexander
Time obviousely is not a dimension, but a coordinate. Dimension is defined as a degree of freedom to move back and forth in, but how to move back and forth in time.

Time is a demension. (why do people keep saying it isn't?) A coordinate is :
"Mathematics: Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references. "

And since you agree with time being a coordinate, then you must agree with this definition I found at dictionary.com

Isn't time simply the movement of information through consciousness?

Originally posted by Tom Leigh
Isn't time simply the movement of information
through consciousness?
Intresting perspective. In a word - yes.
(But there are LOTS of buts one could add. )

Like what? To me time is movement and the primal movement is thought. Unless something moves there is no time, surely?

Originally posted by MajinVegeta
Time is the direction of the increasing of entropy.

There is no such direction.

Entropy is just a fraction of states occupied. Let any system to occupy more states - it occupies more then. Nothing here gives time a "direction".

newton1
well...
i don't think we should find the speed for the time
time is just a coordinate...like a space
time is not a thing ...there is no particles inside the time
i don't we should consider the speed of a coordinate...
only the object moving on the coordinate have time

automaton
havnt physicists accelerated post light/stopped it

i have unfortunately no link currently
however my friend and i read somewhere
where in a special gas light had been accelerated
i also heard light had been decelerated and "stopped"

heres a new search engine] www.kartoo.com
try to find references
anyone else seen this data?

Yes - light can be slowed down. No one said it couldn't!

Here is a pointer.

The rule is that NOTHING can CROSS THE BARRIER of C.

Objects at one moment going below C cannot cross. Objects going over C will never EVER drop below C.

If you guys are trying to understand what happens as something approaches light, I'd suggest you look at relativistc equations.

From those you can derive that, when V = C you have a few different variables (mass, momentum, length, time) which can in the EQUATIONS but not necessarily in reality, adjust such that it will be possible.

You will find that it is the mass and length (therefore momentum) which adjust. And not time.

No one said time travel at any other "speed" than what we travel at time now, would occur if one approaches C. the point made is that relativistic time changes.

If you want the relativistic equations I can get them for you, otherwise takes to long to type, but that's a good starter into looking at what would occur.