Re: Quintessence and Curvature

From: Phillip Helbig---remove CLOTHES to reply (helbig_at_astro.multiCLOTHESvax.de)
Date: 03/22/05 

Date: Tue, 22 Mar 2005 13:46:28 +0000 (UTC)

In article <d1mejl$r3g$1@beech.fernuni-hagen.de>, "Ilja Schmelzer"
<Ilja.Schmelzer@FernUni-Hagen.de> writes:

> > Whether we need an inflation term for the early universe depends on
> > whether or not inflation is necessary. While there are no observations
> > which rule out inflation (which is a bit tricky, since there is no
> > single theory of inflation; it's a bit difficult to rule out all the
> > variants), whether or not there are observations which require inflation
> > is still a matter of debate.
>
> Really?
>
> What are the alternative explanations of the large scale anisotropies
> of CMBR?

In and of themselves, anisotropies are just anisotropies, which reflect
the initial conditions. They could be inflation-magnified quantum
fluctuations, but they could have some other source as well (or perhaps
no source, simply being initial conditions).

> These anisotropies look like fluctuations, but fluctuations need a common
> causal origin. But they are far too large to be explained in this way
> without a''(tau)>0 in the early universe, AFAIU.

Back in 1995, John Barrow wrote a paper in the Physical Review D called
"Why the universe is not anisotropic", which concluded "there is no
anisotropy problem for inflation or quantum cosmology to solve". If
he's wrong here, I'd be interested in the counter arguments. I can look
up the exact reference if you can't find it quickly enough.

Relevant Pages

  • God in Super Cosmos?
    ... self-reproducing universe and the version of the Steady State hypothesis ... C-field playing the part of the scalar field that drives inflation. ... appeared out of nothing at all, and contains zero energy overall, was ... quantum fluctuation so small that it only contained one monopole. ...
    (sci.physics)
  • God in Super Cosmos?
    ... self-reproducing universe and the version of the Steady State hypothesis ... C-field playing the part of the scalar field that drives inflation. ... appeared out of nothing at all, and contains zero energy overall, was ... quantum fluctuation so small that it only contained one monopole. ...
    (sci.astro)
  • why dark energy density is small
    ... Our early universe has low entropy compared to present universe. ... Sir Roger Penrose says this is a big problem for inflation theory - it's the Arrow of Time problem - why irreversible aging is in same sense as expansion of 3D space with dark energy speeding up of that cosmic expansion. ... this is precisely what we expect from the retro-causal world hologram in which 3D space at our moments of perception of our entire pocket universe on the landscape is simply a hologram image of the future 2D deSitter horizon. ... Because it has a very similar formal structure to the internal symmetry Yang-Mills quantum field operators. ...
    (sci.math)
  • why dark energy density is small
    ... Our early universe has low entropy compared to present universe. ... Sir Roger Penrose says this is a big problem for inflation theory - it's the Arrow of Time problem - why irreversible aging is in same sense as expansion of 3D space with dark energy speeding up of that cosmic expansion. ... this is precisely what we expect from the retro-causal world hologram in which 3D space at our moments of perception of our entire pocket universe on the landscape is simply a hologram image of the future 2D deSitter horizon. ... Because it has a very similar formal structure to the internal symmetry Yang-Mills quantum field operators. ...
    (sci.physics)
  • why dark energy density is small
    ... Our early universe has low entropy compared to present universe. ... Sir Roger Penrose says this is a big problem for inflation theory - it's the Arrow of Time problem - why irreversible aging is in same sense as expansion of 3D space with dark energy speeding up of that cosmic expansion. ... this is precisely what we expect from the retro-causal world hologram in which 3D space at our moments of perception of our entire pocket universe on the landscape is simply a hologram image of the future 2D deSitter horizon. ... Because it has a very similar formal structure to the internal symmetry Yang-Mills quantum field operators. ...
    (sci.astro)
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