Natural Science Forum / Physics / Research / August 2007

See this paper by Scarpa et. al.
http://arxiv.org/abs/0707.2459
Quoting abstract:
"We report on the results from an ongoing program aimed at testing

Is the photon entropy independent of its frequency? does it remain
constant? I am trying to work out the photon gas entropy using such a
postulate. Is this well justified? Please cite sources wherever
possible

In the context of the solution of Schrodinger equation, is there any
modified form of the WKB approximation which can be applied for the
Schrodinger equation in cylindrical coordinates? More specifically, if
the potential depends only on the radial distance i.e V=V(r), then one

SHORT SUMMARY FOR BUSY READERS:
whole-body translation and rotation - classical;
torsions - classical;
covalent stretching and bending - non-classical, assume ground state,

25-AUG-2007
Hi all -
Assuming, for the sake of simplicity, a non-rotating BH, it's been
conjectured that for an external observer the "image" of any matter

This is a plea for the experts to refine my understand:
As I understand it, the current state-of-the-art on reconstruction of
QM from postulates, in the vein of von Neumann, has gotten so far:
1. The fundamental measurement of a system, or possible information

Can anyone point me to a proof of the identity stated in footnote 19 of
Wheeler's Geometrodynamics, page 239.
This identity is a follows:
A_ua B^va -*A_ua *B^va=(1/2)lambda_u^v A_abB^ab  (1)

[ Mod. note: Please keep the discussion on topic (physics).
 Philosophical content, if any, should be brief, to the point, and
 preferably restricted to references.  -ik ]
I'd like to learn about the nature of time, about its ontological reality

Insofar as I understand, the action S = $d^4x L, where L is the
Lagrangian density, is always a multiple of 1/2 unit of the reduced
Planck's constant ($ denotes an integral), that is:
S = $d^4x L = +/- .5 n h-bar   (1)

As is often the case, I've realised something obvious, but don't know
where to head next -- so naturally I'm asking on
sci.physics.research... Essentially, I'm wondering about what we're
really measuring in GR, and whether they make sense in a quantum

I hope this question isn't too elementary for this group.
I (more or less) understand why the sky is blue (Rayleigh scattering
because incoming sunlight turns air molecules into oscillating
dipoles, etc.).  But I am vague on why the air all around us isn't

Can anyone point me to some background for what looks like a bit of
sleight-of-hand in Feynman's half of the 1968 Dirac Lectures
(published together with Weinberg's lecture, in "Elementary Particles
and the Laws of Physics", Cambridge UP, 1987).

OK, Basically, I am interested in studying quantum phenomena,
specifically in a method that mimics the development of the field
through history.
I want to know where I can read each of the original landmark

Hello..
I have been trying to solve a simple problem in relativity but have
got stuck at one point..
Let us consider two identical particles A and B which are initially at

(A part of) My paper "GR-friendly description of quantum systems"
(IJTP, DOI 10.1007/s10773-007-9474-3,
http://www.springerlink.com/content/w3175m02836610t4/?p=e2f0a2261a4248e69cdb5eb7
8668af77&pi=2
) may be of interest to both theoretical and experimental physicists.