What is beyond the boundaries of our visible universe?

[pranab]

What is beyond the boundaries of our visible universe? Probably the dark energies.
* Dark energies has suffieciently negetive pressure and can cause expansion of our universe, once it statrts dominating over the matter.
* The study of high shift supernova can determine the expansion rate of the universe. It is clear that universe was decelerating at higher red shift and statred accerating when it was about 2/3rd of the present size
* For Dark energy requires a Relativistic particle with one dimensional position say q(t) and mass is described then by the lagrangian (am i Correct in Spell?) L=-m(1-q*.2)*1/2. it will have then energy E= m(1-q*.2)*1/2 and momentum K=mq/(1-q*2)*1/2 which are related by E*2=K*2+m*2. This equation allows possibility of mass less particles with finite energy E= K*2 when m--0 and q---1, while keeping the ratio in E=m/(1-q*.2)*1/2 finite.
*If we asssume that the dark energy in the universe is due to cosmological constant then this universe will be de- sitter universe in the three phase
a) In first phase when the universe went through inflationary expansion and when hubble radius= constant
b) In second phase ie radiation and matter dominated phase when hubble radius increased monotonously
c) Accerated Expansion phase governed by cosmological constant where hubble radius is again a constant
The two de sitter phase a) & b) are of long duration and C if last for ever
and so string theory can support the Big Bang as De- sitter universe and we can tell that universe is in Re- inflation state
[ * means here to the power as there is no superscript in the tools]

Mr. Rupak Bhattacharya
Mr. Ritwik Bhattacharya
Dr. Pranab Kr Bhattacharya
www.unipathos.com

[Dragon Star]

Alright, you said a mouthful there. Welcome to EAF.

Your spelling of Lagrangian is correct, just needs to be capitalized.

I am confused as to you stating that beyond the observable universe is Dark Energy...are you claiming that is all that is beyond the observable universe?

Why is there more Dark Energy in the unobservable universe then the observable?

[Blue Fire]

I'm just trying to understand here, so don't beat me up, Please?

Originally Posted by pranab

What is beyond the boundaries of our visible universe? Probably the dark energies.
* Dark energies has suffieciently negetive pressure and can cause expansion of our universe, once it statrts dominating over the matter.

How does this apply specifically to what is Beyond the visible boundary, other than to imply that there Might be something more to the universe other than what we can observe? Dark energy is already theorized to exist Within the observed universe, so maybe there is just more of "regular universe stuff" past our observable boundary?

* The study of high shift supernova can determine the expansion rate of the universe. It is clear that universe was decelerating at higher red shift and statred accerating when it was about 2/3rd of the present size

Decelerating? Forgive my ignorance, but apart from the initial inflationary period, I always thought Acceleration was the rule throughout.

* For Dark energy requires a Relativistic particle with one dimensional position say q(t) and mass is described then by the lagrangian (am i Correct in Spell?) L=-m(1-q*.2)*1/2. it will have then energy E= m(1-q*.2)*1/2 and momentum K=mq/(1-q*2)*1/2 which are related by E*2=K*2+m*2. This equation allows possibility of mass less particles with finite energy E= K*2 when m--0 and q---1, while keeping the ratio in E=m/(1-q*.2)*1/2 finite.
*If we asssume that the dark energy in the universe is due to cosmological constant then this universe will be de- sitter universe in the three phase
a) In first phase when the universe went through inflationary expansion and when hubble radius= constant
b) In second phase ie radiation and matter dominated phase when hubble radius increased monotonously
c) Accerated Expansion phase governed by cosmological constant where hubble radius is again a constant
The two de sitter phase a) & b) are of long duration and C if last for ever
and so string theory can support the Big Bang as De- sitter universe and we can tell that universe is in Re- inflation state

Perhaps this is where I'm losing it re my earlier comments. I don't understand the above. If I'm being terribly dense here or just plain naiive, please don't hit me too hard. A mild kick in the behind will do just fine. And, then the rest of you can continue to hash this out. Thanks!

[Dragon Star]

Originally Posted by Blue Fire

Decelerating? Forgive my ignorance, but apart from the initial inflationary period, I always thought Acceleration was the rule throughout.

Actually he is right, after the force of the initial inflation and forced expansion started loosing momentum, gravity made an attempt to crunch the universe, but for unknown reasons (perhaps the space in which gravity had a hold was too large for it to over come the force of dark energy, and is continuing to have less effect on universal expansion due to increased space between objects) dark energy started accelerating the universe again...and continues to do so.

[pranab]

The fact is that our universe is fairly homogenious & isotropic at larger scale larger than 150 h*-1MPC where 1MP~ 3x10*24 Cm and h~0.7
The fact is also that our universe is expanding. The Mean distance between galaxies is 1MPC and our visible universe is about 300h*-1MPC
Our universe has a critical energy density and that critical energy density have different components ( Like baryons density, Dark Matter density, Radiation density). Cosmic microwave Back ground Radiation Study(CMBR) also prove that that we live in a universe with Critical density
Total ammount of Baryons in the universe produced in the Big Bang nuecleosynthesis OmegaB=(0.024+-0.0012)h*-2 where h=0.72+-0.7 and all baryons exist in the universe today irrespective of whether they are luminious or not. But most of the universe is Non baryonic
universe is populated by non luminiuos component of Dark matter made of WIMP and this component is OmegaDM~=0.15-0.3
so there must be one or more components to the energy density of universe contributing aBout 70% of critical density and this component is unclustered and has negetive pressure and this component omegaDE~=o.7-0.85
The universe has also radiation contributing to OmegaRh*2=2.56x10*5 to day which are mostly photon in CMBR and these photons are at red shift larger than Zeq~- OmegaDM/OmegaR~-4x10*4DMh*2
and So our universe must has omegaDE~-0.7,~-0.26 beyond the CMBR ie observable universe
The dark energy with suffieciently negetive pressure( can be treated as fluid with stress tensors) will accereate the expansion of universe once it can dominate the matter
If Dark energy is taken as cosmological constant Omegatot=1 and when omegam=1 with no dark energy, universe is then Decelerating at all epoch aND When Omega m=0 and Omega DE=1 then universe is accelrating at all epoch. And in between this lies that universe is were decelerating in the past and to accelrating when dark energy is dominating as above shown
Mr. Rupak Bhattacharya
Mr. Ritwik Bhattacharya
DR. Pranab Kr Bhattacharya
www.unipathos.com

[Dragon Star]

pranab, I am going to ask you to stop placing links to you're site in every post you make, self promotion is considered inappropriate here. If you want to try to get your link submitted to the link sections of the site, PM Darryl and he will review it.

I will also ask you to answer my questions, please.

[pranab]

Dear Dragon Star
Probably I answered your Question in my 2nd Postings( Postings No 5). Please go through it and U can find the answer that why Dark energy is more in Nonobvservable universe
Dr. Pranab Kr Bhattacharya

[Dragon Star]

I still wasn't able to find it, was it expressed mathematically? If so, that's why.

[dmill1220]

Has anyone heard of the other possible theory were dark energy does not exist but varying gravity fields do?
personally I believe in the standard Cosmology theory and not what I heard about this new theory, I think that one is a far stretch. Im with Mr Pranab. the math simply cannot lie, Unless we rewrite all of our understanding of Phsyics. this Seemingly undetectable dark Matter If we can ever Actually detect it would open up a whole new understanding to our Universe.
not to change the subject, but has anyone ever studied what the Ancient Hindus Say about our universe with its expansion and contraction then compression to start a new big Bang? the universe could be much weirder than we all think. Arent we now looking for neutralinos!
Dennis

[Blue Fire]

Originally Posted by dmill1220

Has anyone heard of the other possible theory were dark energy does not exist but varying gravity fields do?
personally I believe in the standard Cosmology theory and not what I heard about this new theory, I think that one is a far stretch. Im with Mr Pranab. the math simply cannot lie, Unless we rewrite all of our understanding of Phsyics. this Seemingly undetectable dark Matter If we can ever Actually detect it would open up a whole new understanding to our Universe.
not to change the subject, but has anyone ever studied what the Ancient Hindus Say about our universe with its expansion and contraction then compression to start a new big Bang? the universe could be much weirder than we all think. Arent we now looking for neutralinos!
Dennis

The bold above is mine: did you mean dark Energy? As far as Dark Matter goes, you may be interested in the discussion of the ground-breaking first direct observation of it in this thread (Ground breaking Dark Matter observation). In any case, I also subscribe to current cosmology, that is, as far as my limited understanding of it goes. But I wouldn't mind looking at varying gravity fields in light of some aspects of string/M theory that suggest the relative weakness of gravity that we observe is possibly in contrast to it's greater strength within the tightly curled-up extra dimensions. Do you have any links that might enlighten me?

I'm not familiar with what the ancient Hindus may have thought about the expansion/contraction of the universe. Care to share?