How to compute the path integral in Chen-Simons theory?(the one Witten used to explain Jone polynomial)? Is there any measure in there? Thanks!

What's the relation of it with Wightman axioms ans etc.? Thanks! Or which one is the one we prefer?

I'm reading an 'armchair physics' book (A User's Guide to the Universe), and find it fascinating, but am having trouble understanding something that seems pretty fundamental. Conc …

Admin, could you put this site in bootstrap mode? It would be very helpful.

So we know that if you have enough mass in a small enough radius you get a black hole. This radius being r= 2Gm/c^2. This all assumes that the total mass m is within that radius r. …

Hi all! A question I've had for a while: On the surface of the Moon, while under direct sun radiation, is there any way of cooling up an object? There appears to be no natural sh …

Since this site is not in bootstrap mode, if anyone doesn't have 15 rep, just leave an answer here, and we will try to vote you up. Even better, could the Admin put this in bootstr …

Please, give us LaTeX rendering in questions and answers so our formulae look pretty? mathoverflow.com is a pretty good example of how to do things right. The jsMath package defin …

The electric field amplitude, and its variations travel in propagation direction. So if does really exist a propagation direction, what happen in other directions? is this wave inf …

Can someone point me towards (or just give) a clear mathematical explanation of what a spinor is and how one computes with them? I'm reading some QM textbooks that use them to des …

To calculate the position of a planet as a function of time in the (classical) Kepler/Newton two body problem seems really hard when I look at: this wiki entry Do you know of any …

Sometimes I see Maxwell's equations in the vacuum written as BOX A_u = 0 where BOX is the d'Alembertian operator. http://en.wikipedia.org/wiki/Maxwell%27s_equations#Four-potential …

Please commit to the Physics proposal on Area 51. This site is going to shutdown who knows when, but they will probably be shutting it down without further warning. So please commi …

Hi, I'm trying to make a connection between physical description of light (involving wave lengths, Poynting vector and energy density) and radiometric quantities:] Radiant energ …

I'm writing a short sci-fi story about an advanced race (think Xeelee) that retreats from the universe at large by distorting a section of space so that it's mostly isolated from t …