Re: Quintessence and Curvature

From: Phillip Helbig---remove CLOTHES to reply (helbig_at_astro.multiCLOTHESvax.de)
Date: 03/19/05 

Date: Sat, 19 Mar 2005 08:00:07 +0000 (UTC)

In article <d19c3r$4ee$1@beech.fernuni-hagen.de>, "Ilja Schmelzer"
<Ilja.Schmelzer@FernUni-Hagen.de> writes:

> "Phillip Helbig---remove CLOTHES to reply" <helbig@astro.multiCLOTHESvax.de>
> schrieb
> > It might depend on what you mean by quintessence. This term is used by
> > different people in different ways. The simplest form is the plain old
> > cosmological constant, and there is NO evidence that this is not
> > sufficient to explain ALL observational data.
>
> AFAIR, together with Einstein's constant we need at least two
> things: cold dark matter (or something replacing it) and an inflation
> term for the very early universe.

Cold dark matter has nothing to do with "quintessence".

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.

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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