LizR wrote:
On 7 November 2014 12:32, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
I have not seen your arguments for this, being new to the list, but
the expansion of the universe is a universal consequence of general
relativity. So it is built into the laws of physics, and has nothing
to do with whether or not there ever was a period of rapid inflation.
Expansion or collapse is a consequence of GR, certainly. However I was
thinking on a larger scale with the EI comment, since EI seems to
necessitate the existence of expanding universes. Not sure that it can
be counted as a TOE though, so it's still in need of ultimate explanation..
The AoT comes from the third law of thermodynamics and has little to
do with the expansion of the universe. Entropy increases in the same
direction as the expansion solely because the universe 'began' in a
state of very low entropy. (The Past Hypothesis).
I didn't realise there was a 3rd law, but anyway - saying the U began in
a low entropy state begs the question - why did it? The big bang
fireball was more or less in thermodynamic equilibrium as far as I know,
and if it had stopped expanding it would have rapidly reached that
stage. My point is to explain the
Sorry -- typo. I meant the second law, of course.
I agree that the past hypothesis, while it explains the thermodynamic
AoT, itself stands in need of explanation. This is the great unsolved
problem of cosmology -- at least according to many cosmologists. The
initial big bang might be assumed to be in thermodynaic equilibrium, but
that is essentially the same assumption as the assumption of low
entropy. The question remains as to why it was in equilibrium. Generic
creation events might actuallybe expected to produce extremely lumpy
universe down to the smallest scaels. I.e., state with very high entropy.
Bruce
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