Supernovae GRB Research: Insight for Fans

[Chronos]

Supernovae fans may find this of interest, I know I did:
http://arxiv.org/abs/astro-ph/0402404

 

[meteor]

The paper says that quark stars should be a mixture of up, down, and strange quarks. I wonder why is not permitted the presence of charm, top and bottom quarks

 

[selfAdjoint]

The paper says that quark stars should be a mixture of up, down, and strange quarks. I wonder why is not permitted the presence of charm, top and bottom quarks

Ordinary matter at ambient energies does not contain the c, t, and b quarks. Quark stars are theorized to be a late state of ordinary matter stars.

 

[meteor]

Interesting the possibility of the existence of Hybrid neutron stars (neutron stars with a core composed of quark matter). It remembers me the Thorne-Zytkow object (a red giant with a neutron star inside). Spectacular if can exist the stellar russian nesting doll (I mean a red giant containing a neutron star and this containing a quark star)!

 

[meteor]

So, I keep reading the article and then it's mentioned the fact that neutrinos are trapped in the interior of a newborn neutron star. This phenomenon is called neutrino trapping. What is the nature of this phenomenon? Neutrinos hardly interact with anything, how can they become trapped?

 

[Chronos]

So, I keep reading the article and then it's mentioned the fact that neutrinos are trapped in the interior of a newborn neutron star. This phenomenon is called neutrino trapping. What is the nature of this phenomenon? Neutrinos hardly interact with anything, how can they become trapped?

This has to do with what is referred to as the neutrino opacity temperature [~1MeV]. Neutrinos cannot escape from the stellar core above this temperature.

 

[Nereid]

This has to do with what is referred to as the neutrino opacity temperature [~1MeV]. Neutrinos cannot escape from the stellar core above this temperature.

because ... ?

Let me guess (no, I've not read the paper) ... it's much the same reason it takes 'light' millions (?) of years to escape from the core of the Sun ... the neutrinos can only travel a short distance before they collide (inverse beta?) with a proton/quark/whatever and are absorbed, to be re-emitted some short time later, in a direction that's random wrt the one they were originally travelling. Now how does this relate to temperature?

 

[Chronos]

The temperature relationship to neutrino trapping is discussed in this paper
http://arxiv.org/abs/astro-ph/9807040

 

[meteor]

That's great. I've read a bit about all this stuff, and I've learned that the zone dividing the trapped neutrinos from those free to escape is called neutrinosphere

 

[north]

on the site that Chronos mentioned above, i read the article and came across a part on neutron stars collapse. and that this would eventually lead to a black hole.

first the neutroinosphere. this would be caused not by temp. but pressure.

this is because in a neutron star, neutrons are so mass less that they are the last to be crushed by gravity. gravity is, from a high energy plasmic point of view, is crushing matter to the state of pure energy( back to the point of plasmic energy,non-particle forms). which then the neutron gets absorbed back into this plasma energy form by absorption of its wave length. this because high energy plasma has within it all wave lengths that are known.

some neutrinos escape in the proto phase of a neutron star,but in time of course this will lesson as gravity becomes stronger and therefore increases it's grasp on particles which have less and less mass.

 

[north]

supplemental

of course the temps; cause by the crushing by gravity, could not counter gravity because moving at only the speed of light couldn't escape. which would add to the internal pressure as well.

 

[north]

in any black hole, matter is crushed to the point of pure high energy plasma(non- particle form). this would be true in, dimension,space and time.therefore the black hole would not loose any macro-characteristics.since dimension,space and time would collapse together. therefore at it's point of maximum singularity, being a high plasma energy state that is still in the particle form. as an increase in gravity pressure continues,it melds into the high energy plasma(non-particle form) and the pressure of gravity is pulled away by the flow of high energy plasma therefore relieving gravitational pressure and then the singularity disperses(with time), as the form of the singularity is absorbed.

 

[north]

disperses here means,as the wave lengths present in the singularity are absorbed,the singularity it's self begins to decrease in it's form( from a 3D point) to 1/2, 1/4, 1/8...etc. of the 3D form, until completely absorbed. which happens extremely quickly or instantaneously. depending on the strength of gravitational and other internal pressures and becomes again part of the line of a 3D filament of high energy plasma.(non-particle)

 

[meteor]

http://xxx.lanl.gov/abs/astro-ph/0410728
this appeared today. Is a unified model for short GRBs and long GRBs. According to this model, both kinds of GRBs arise from the same phenomenon (high energetic supernovae). The difference is that we are viewing the jet from different angles. I want to remind that the scientific consensus nowadays is that long and short GRBs arise from different phenomena

 

[north]

http://xxx.lanl.gov/abs/astro-ph/0410728
this appeared today. Is a unified model for short GRBs and long GRBs. According to this model, both kinds of GRBs arise from the same phenomenon (high energetic supernovae). The difference is that we are viewing the jet from different angles. I want to remind that the scientific consensus nowadays is that long and short GRBs arise from different phenomena

define "DIFFERENT PHENOMENA"

 

[meteor]

define "DIFFERENT PHENOMENA"

habitually was thought that long GRBs arise from hypernovae, and short GRBs from a different process (e.g. the collision of two neutron stars)

 

[north]

as well, other states of matter(gas,liquid,solid) are elecrically neutral BUT high energy plasma is not. it has ALL wavelengths and i do mean ALL. it has wave lengths even beyond our ability to detect. it has, ALL phenomenon.

 

[north]

habitually was thought that long GRBs arise from hypernovae, and short GRBs from a different process (e.g. the collision of two neutron stars)

in a hypernova, if i understand what your thinking here, is a star which had an imbalance. and the imbalance causes the star to implode. the explosion i suspect is the point of instance with which the balance was broken enough that instead of moving Out from the center of the galaxy, it is now moving in. this then sets up the building of a black hole.

in the collision of two neutron stars. to me at this point i cannot say wether short GRBs are not from the collision of two neutron stars. but i look at it this way. if two neutron stars collide, since they are of the same wavelength,
they will meld into each other quietly(since they are on the same wave length no energy escapes but energy is absorbed). therefore no gamma rays produced. this then leads to WHAT are GRBs,of any length, and that leads to the study of Plasmas and Cosmic Plasmas.

a couple of sites are; www.theuniverse.ws[/url] and [url]www.plasma.org[/URL]


enjoy!

 

[Nereid]

in a hypernova, if i understand what your thinking here, is a star which had an imbalance. and the imbalance causes the star to implode. the explosion i suspect is the point of instance with which the balance was broken enough that instead of moving Out from the center of the galaxy, it is now moving in. this then sets up the building of a black hole.

in the collision of two neutron stars. to me at this point i cannot say wether short GRBs are not from the collision of two neutron stars. but i look at it this way. if two neutron stars collide, since they are of the same wavelength,
they will meld into each other quietly(since they are on the same wave length no energy escapes but energy is absorbed). therefore no gamma rays produced. this then leads to WHAT are GRBs,of any length, and that leads to the study of Plasmas and Cosmic Plasmas.

a couple of sites are; www.theuniverse.ws[/url] and [url]www.plasma.org[/URL]


enjoy![/QUOTE]north, thanks for your posts.

However, and perhaps it's just me, but there seems to be considerable confusion in your posts ... For example, the collision of two neutron stars has been extensively modeled, and it does most certainly produce gammas, copious quantities of them. The key question is how well the gamma (and X-ray, and optical, and ...) signature matches the observed short (or long) GRBs (or not). Similarly, whether the short GRBs are merely the first, most violent, sign of a 'flare' on a magnetar can likewise be wrestled with by comparing the observed time and wavelength data against theoretical predictions (there are other tests too).

Note that whether it's colliding neutron stars, hypernovae (or merely common supernovae), magnetars, ... in ALL cases it is plasmas which give rise to what we 'see' (exception: neutrino emission is due to processes that take place within nuclear material, and are only 'plasmas' to the extent that the term has been generalised to cover a completely different physical regime ... the 'quark-gluon plasma', for example).

 

[Garth]

GRBs - May they be exploding primordial back holes a la Hawking?
Garth

 

[north]

[

QUOTE=Nereid]north, thanks for your postsHowever, and perhaps it's just me, but there seems to be considerable confusion in your posts ... For example, the collision of two neutron stars has been extensively modeled, and it does most certainly produce gammas, .copious quantities of them. The key question is how well the gamma (and X-ray, and optical, and ...) signature matches the observed short (or long) GRBs (or not). Similarly, whether the short GRBs are merely the first, most violent, sign of a 'flare' on a magnetar can likewise be wrestled with by comparing the observed time and wavelength data against theoretical predictions (there are other tests too).

Nereid, thanks for your feed back.

i look at it this way, first, we know that the essence of all matter is high energy plasma(non-particle, if it is particle i will say so) and that as it cools this starts the producing of particles, being as well that the other three states are electrically neutral.

where ever plasmas are present they produce huge amounts of electromagnetic radiation,x-rays and gamma rays, this then according to the Cosmic Plasma people, is caused by the heating of free electrons, to about 1million degrees. this then is the realm of hot magnetized plasma.

so now we have GRB which are short and long, these i think are not caused by the colliding of neutrons but the interaction of there magnetic fields,in which their collective free electrons and tightened magnetic field lines are coming in contact before the neutron cores themselves come in contact and sometimes there are many free electrons and sometimes there are not hence,long and short bursts. as well, from what i found so far these bursts are extremely short in duration.

 

[Chronos]

Cosmic plasma people? Last time I checked plasma cosmology was retired.

 

[meteor]

This paper discuses the possibility of using GRBs as standard candles
http://xxx.lanl.gov/abs/astro-ph/0411106

 

[meteor]

You have to be Swift

Swift, the new GRB-hunter, is now in orbit!
http://www.nasa.gov/mission_pages/swift/main/index.html

 

[Nereid]

GRBs - May they be exploding primordial back holes a la Hawking?
Garth

No. IIRC, other than a vague, possible match to the timescale, nothing observed comes anywhere close to the classic Hawking exploding (actually, evaporating) primordial BH.

 

[Nereid]

i look at it this way, first, we know that the essence of all matter is high energy plasma(non-particle, if it is particle i will say so) and that as it cools this starts the producing of particles, being as well that the other three states are electrically neutral.

Hmm, not sure what this means

where ever plasmas are present they produce huge amounts of electromagnetic radiation,x-rays and gamma rays, this then according to the Cosmic Plasma people, is caused by the heating of free electrons, to about 1million degrees. this then is the realm of hot magnetized plasma.

lots rolled up here; one at a time:
- there are plenty of ordinary, everyday examples of plasmas which don't 'produce huge amounts of electromagnetic radiation,x-rays and gamma rays' - neon advertising signs, sparks (as in your average car engine, electrostatic discharges, etc), the ionosphere, the interplanetary medium, the interstellar medium (most of it), the intergalactic medium, ...
- many of these plasmas have electron temperatures of 1 million degrees, and much, much higher. Of course, those which are that hot do indeed radiate X-rays (that's how we know how hot they are!). Too, most are 'magnetized'; indeed, being plasmas, and having at least some relative motion, it's impossible for them to be not magnetized!

so now we have GRB which are short and long, these i think are not caused by the colliding of neutrons but the interaction of there magnetic fields,in which their collective free electrons and tightened magnetic field lines are coming in contact before the neutron cores themselves come in contact and sometimes there are many free electrons and sometimes there are not hence,long and short bursts. as well, from what i found so far these bursts are extremely short in duration.

You may be right. However, the challenge, should you choose to accept it, is to show that the physical processes you describe result in gamma bursts with the spectral and time profiles that are observed (oh, and the X-ray and optical and radio spectra and time profiles too). You do understand why this is important, don't you?