Natural Science Forum / Physics / Research / August 2008

Is there any proof that electrons can absorb photons or emit photons?
Can someone prove to me its the electrons and not the bonds or holes
that absorb, emit or hold the photon?
Has anyone ever seen with an instrument an electron absorb or emit a

Hello..
I have one question regarding Turbulence.
The basic idea behind modeling turbulent flows is to find the energy
spectrum for different length scales which are present in the system.

I am stuck at the math one needs to do to mix colors. Here is the
exact problem statement:
I am provided the intensities (a.u.) of all the wavelengths in the
visible range (400 to 670 nm). I know the RGB values (between 0-1) at

If dark energy did work the same as one of the fields that we know can
be amplified how would you go about it?
What materials or imaginary materials would you need?
What  basic knowledge would you need to know about dark energy to

Proca theory for a real massive vector boson is not gauge-invariant ;
is it renormalizable ?
-----
Mike

Question from a GR student:
There is a classic question that students ask in GR that I havent been
able to find  a really good explanation for.  Simply put, if a
particle as observed from a distant observer would appear to never

I held a green laser on a black panel for 3 minutes. No effect.
Held green laser on a white panel for 3 minutes. No effect.
Held green laser on edge of black panel (2/3 on panel, 1/3 off). Vanes
started turning within 12 seconds.

I'd like to ask about the sheet analogy for space curvature. As you
know,  if a  ball were placed on a rubber sheet a cuplike depression
would be created. A marble placed near the depression rolls down the
slope toward the  ball as if pulled by a force.  In addition, if the

I just say Leonard Susskind's Book TV appearance and am curious about
the conservation of information in quantum mechanics. Any
deterministic time reversible theory must conserve information and I
believe the evolution of the wave function satisfies this. However,

All
Here is an hypothesis for dark matter.
What factors negate it?
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Can anyone please briefly explain as to what role fourier transforms
play in x-ray crystallography ?
Suggest some books or online links to know more on this aspect ...

I am interested if there is any change in the status of the standard
model of the electro-weak interaction due to the
experimentally/observationally confirmed non-zero mass of the neutrinos.
Is model still considered valid (i.e. with only minor modifications due

When the SU(2) symmetry is broken
by the Higgs mechanism,
the W bosons acquire mass
and become the well-known W^+ and W^-

The EPR paradox argues that quantum mechanics cannot describe all
elements of reality, and so is incomplete.   Bohr replied, in part,
that it describes all actually measured elements of reality, which is
all one can expect (and disagreed that EPRs example constituted

Does anyone know of any QED simulation program or text which is more
aimed towards understanding the principles than giving cutting-edge
results ? When searching for simulation results, you usually just get
a bunch of lattice QCD research which is a bit overkill.