Everything has a half-life.

Hi Uno_Lapideus, Lambda_CDM is the standard model of cosmology;
but it deals only with the observable universe.

While the density of the observable universe first popped below Planck density
13.7 billion years ago... there is no limit to
how dense/old/wide the unobservable part hight've been before then.

I'm guessing that lambda is, was, and will be forever constant.
The universe, observable or not, has just always been dissipating
at a constant acceleration... lambda.

The net energy of the cosmos is negative... a virtual energy deficit.

I think dissipation is simply a property of mass-energy,
everything has a half-life.

Spacetime itself, -- over cosmic-time --, has been expanding at
a very _Constant_ rate as far back as can be observed,
and, -- most likely --, forever.

I call that dimension _Entropy_, not cosmic-time,
because it's quite seperate from the time in spacetime,
....and because entropy is how dissipated something is,
similar to heat capacity, in joules per kelvin.

Infinite Density_and_Heat has no entropy and
perfect Vacuity_and_Coldness has infinite entropy.

But infinite Density_and_Heat means infinite acceleration
and infinite Unruh radiation,
i.e. more directed energy than could exist in any imaginable cosmos.

And, likewise, it takes energy to maintain a vacuum,
so it'd take more directed energy than could exist in any imaginable cosmos
to create a perfect vacuum, so perfect Vacuity_and_Coldness couldn't exist.

Still, notionally, the cosmos is going from no entropy to infinite entropy
according to the second law of thermodynamics and
the observed value of General_Relativity's cosmological _Constant_, lambda.

WMAP and SNLS have _Very_ precisely pinned down lambda's value.
SNLS' prelimiary data, one tenth of what it hopes to get,
has lambda constant, +- 10 percent, for the last 8 billion years.

By 2008, SNLS hopes to narrow that down to a 3 percent error.
SNAP hopes to drop it to 1 percent: SNAP.LBL.GOV/science.html

Only SNAP, tentatively launching 2010, can measure high_z values,
i.e. high red-shift, deep infrared, the first supernovae.


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