Prev: Really Poor Wiki Article On Hard & Soft Science
Next: NEANDERTHAL GENOME SEQUENCED
From: Rock Brentwood on 13 Jul 2010 22:35
On Jul 10, 5:54 am, Jarek Duda <duda...(a)gmail.com> wrote:
> I always thought that thermodynamics/statistical physics is effective
> theory – statistical result of some fundamental physics below, but
> recently there became popular theories starting from ‘entropic force’
> as fundamental (basing on holographic scenarios, like inhttp://arxiv.org/abs/1001.0785).

Newspapers need to learn how to properly frame stories. This is not
some "new and sensational discovery announced here today!", but just
an extension of what's already a running thread in the literature and
has been for nearly 20 years (and more).

If I didn't see Jacobson's name in the reference list, I would have
called it plagarism. Look up his article in the reference list. That's
what it's all about and this paper is just a "I'm going to add my 2
cents so I can have an excuse to publish the same damn thing from
'another point of view'" type thing. The literature is replete with
these.

Jacobson didn't say that thermo is fundamental. He said -- to distill
it in a way that best fits how you think of thermo -- that gravitation
can be derived from the laws of thermo, when the following specific
interpretations are taken:

0th law: the Hawking Unruh temperature is taken as T in the second law

1st law: the continuity equation for the stress tensor is taken as the
first law

2nd law: dQ = T dS, where Q is the energy flux across a causal horizon

3rd law: the entropy is taken as proportional to the area over a
"causal horizon", this gives you S

Combined, this gives you Einstein's equations. In addition (a point
Jacobson failed to make, but implied in his paper): the actual
constant of proportionality is determined by the condition that
everything be made to fit Newton's inverse r^2 formula with Newton's
constant G as the proportionality factor.

The way Jacobson went on to explain matters is that the "graviton" is
no more fundamental than the phonon is in solid state physics. That
means: (1) the "graviton" is for all intents and purpose a vacuum
phonon and (2) there is a ultraviolet breakdown, entirely analogous to
that for phonons in solid state physics.
 | 
Pages: 1
Prev: Really Poor Wiki Article On Hard & Soft Science
Next: NEANDERTHAL GENOME SEQUENCED