On 1/7/2014 10:13 AM, Jesse Mazer wrote:
On Tue, Jan 7, 2014 at 12:16 PM, Jason Resch <jasonre...@gmail.com
On Tue, Jan 7, 2014 at 11:00 AM, Jesse Mazer <laserma...@gmail.com
So, to explain the asymmetry between past and future--the "arrow of
2nd law alone won't do it. You need to either assume low-entropy
the Big Bang (which might themselves have some explanation in an
inflation" theory, see for example Sean Carroll's theory which he
a blog post at
the paper linked to there, and further in his book "From Eternity to
some basic time-asymmetry in the fundamental laws of physics, although
I get the
sense that the second is not a very popular approach to explaining the
time among physicists (and it's not really clear to me what the
be between time-asymmetry in some new theory like quantum gravity, and
failure of the 2nd law to apply in reverse).
That is interesting. Is it the same idea that David Layzer uses here
http://www.informationphilosopher.com/problems/arrow_of_time/ to use the
of the universe to explain the increasing room for explaining how the room
possible entropy grows faster than energy and matter equilibration?
They seem to have in common the idea that the maximum entropy can continually increase
due to the expansion of space. But I don't think Layzer's account works as a full
explanation for the arrow of time, since you imagine a universe that on a cosmological
scale looks like the time-reverse of an expanding universe, but without needing to
reverse the arrows of time due to local increases in entropy (for example, the
psychological arrow of time for intelligent beings would be such that they measure the
universe to be contracting rather than expanding).
Layzer of course didn't know about the holographic principle, which implies that the
maximum possible entropy increases in proportion to the surface area of the Hubble sphere
rather than the volume. Vic Stenger has noted that if you assume the degrees of freedom
for the vacuum are proportional to this area (in Planck units) you get the right order of
magnitude for the energy density of the cosmological constant.
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