Natural Science Forum / Physics / Research / March 2007

Is there any formal rule of "quantisation of any system" whether its a
particle (single or many) or field.Should we think about quantising
nonholonomic system or its just that nonholonomic systems occur in
claasical relm. Anyway nature is already quantum so its the general

I am studying a little bit of loop quantum gravity these days. And I
am a little bit confused.
EInstein-Hilbert action can be written as Sigma^F + lambda Sigma
^Sigma + Psi Sigma^Sigma.

Hi. I was reading a bit about ring accelerators and it seems that they
generally use protons more often than nuclei. Sure, theres RHIC but
why not use deuterium or tritium to lower synchrotron radiation
losses? I'm guessing its just because it doesnt work this way. Why

Received from family by email:
"THIS IS A FIRE RAINBOW - THE RAREST OF ALL NATURALLY OCCURING
ATMOSPHERIC PHENOMENA. THE PICTURE WAS CAPTURED THIS WEEK ON THE IDAHO/
WASHINGTON BORDER  THE EVENT  LASTED ABOUT 1 HOUR CLOUDS HAVE TO BE

Black hole event horizons are circular in shape, in isolation.But if
one black hole approaches another black hole the event horizons of
both holes must distort away from circular.Indeed the closer the holes
get together the closer the distorted part of the event horizons

maybe someone knows the answer to the following
question that has been puzzling me for some time now.
Thermodynamic stability of a paramagnetic system seems to
require a nonnegative magnetic susceptibility (convexity of the free

Pons and Fleischman used a palladium cathode in their cold fusion
experiment of 1989 (cathode immersed in heavy water,D20)and they said
that excess energy was released from the system.
Since 1989 lots of experiments have been done and some researchers

i want to study growth of liquid crystal.
suggest the compound.
also tell how to  study different characteristics of LC.

In general relativity, how do spacelike geodesics evolve? E.g., if you
have a globally hyperbolic spacetime and choose a Cauchy surface, and
then evolve it a little bit forward in time, does a spacelike geodesic
in the first surface evolve into a spacelike geodesic in the second?

any example of spacetime which is not locally conformally flat?
Thank you

When noble gases are "injected" into bubbles in the phenomenon of
sonoluminescence, the light bursts intensify.It is possible that
the noble gas is being heated and made to glow in the walls of the
bubble or inside the bubble itself.But how is the heating occurring -

I have recently completed reading "Deep Down Things" by Bruce Schumm.
It it Bruce gives an excellent description of how quanta behave
relative how particles of like charge repel each other. However, there
is no description of how particles of opposite charge attract each

is it true that in any spacetime M (aka real smooth 4-dim connected
Hausdorff paracompact manifold without boundary with smooth
lorentzian
metric) every point in M admits a neighborhood which contains no

If negatively charged hydrogen molecules were fed into a high
temperature superconductor material (at a temperature higher than 21K
- the boiling point of hydrogen gas),would they conduct electric
current better than electrons,given that

In my spare time, I'd like to learn some mathematically rigorous quantum
field theory. John Baez wrote in an old message from May 2003: