A few simple questions: 1) Whats the exact value of Hydrogen line? 2) And under what condition(s) is this value holds true? Regards, Jay Bala.

If dark matter can't even escape the surface of the earth then why don't scientists include dark matter into their models and calculations of the mass of planets and...

This isn't exactly a research-level question, but it seems too technical for sci.math or sci.physics. I'm trying to learn differential geometry from a book by John Baez and...

Hi, I am reading in the introduction of hep-th/0208013: "the low entropy starting point is the ultimate reason that the universe has an arrow of time, without which the...

Hello, I'm trying to understand the difference between Adiabatic Quantum Computation and "traditional" Quantum Computation. I'm not a physicist, my background is in computer...

Hello, When each component of the stress-Energy tensor is divided by a mass density, the result is a tensor object in which each component has the same units as velocity...

Hi Galieo's Dialogues on two world systems has just been translated and published in Turkish. I know this group has an international audience, can you tell me if and when...

In Kerr spacetime there exists CTC's (t,r, theta constant and phi varying from 0 to 2pi) located in the negative space time (r 0). It is tempting to compute the holonomy of...

I recently dug out an old copy I had of Weinberg's original paper "A Theory of Leptons" from 1967 and began to look it over. One thing I'm a bit puzzled about is the claim...

Does anybody know why it is called 'anomaly' if a drag resulting from the loss of kinetic energy of any moving object that travels along a straight line in in homogeneous...

Hello, Is there any empirical evidence that electromagnetic radiation produces gravitational fields? I understand that as a form of energy it is expected to induce a...

Like there is a neutral point of gravity some distance between the Earth and the Moon where both gravitational fields cancel each other out, would there be a point at the...

Ian Parker wrote: On 9 Sep, 02:45, Zach wrote: Are there legitimate cause for concern regarding CERN's Large Hadron Collider? I saw these two...

I have a Kohn-Sham system with a one particle density matrix D(r1,r2) = sum_i r1|ii|r2, where the |i all are eigenfunctions to the Kohn-Sham Hamiltonian H (in other...

Hi group, I've written a paper on the EPR Paradox and I would like to hear, what you think of it. Its first sections of my paper are a review of less known articles by...

I may try to update the physics FAQ on the Crookes radiometer: http://math.ucr.edu/home/baez/physics/General/LightMill/light-mill.html It seems there's still a lot of...

Are there legitimate cause for concern regarding CERN's Large Hadron Collider? I saw these two websites mentioned in the...

Here is simple counter example to 2nd law of thermodynamics - converting heat into work. Everything is in vacuum, without gravity: Take a tube with interior covered with...

Why does dark matter form into a halo around non-dark matter? What prevents dark matter from forming into a nucleus surrounded by a non-dark matter halo? Can dark matter...

Researchers at the UCLA Henry Samueli School of Engineering and Applied Science have succeeded in creating and capturing optical rogue waves and have measured their...