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seen Dec 15 '13 at 13:04

Mar
10
awarded  Yearling
Oct
8
comment Is classical electromagnetism a dead research field?
Isn't this so much a problem as an indication that the theory is incomplete and has to be replaced with quantum electrodynamics, which solves both problems? The self-reaction is subsumed into corrections to the electron propagator and the "reaction force" can be handled in the background field mechanism.
Apr
15
asked Supersymmetry calculations using computer algebra
Apr
11
comment Are the $10^{500}$ different string theories being whittled down?
10^500 is a conservative estimate, the number might be much larger. But even 10^500 is beyond anything imaginable, the whole universe does not contain enough atoms to store 10^500 integers for example, let alone the parameters for 10^500 string models. Also each of those backgrounds potentially has a number of continuous parameters.
Apr
10
revised What is the variation of Gauss-Bonnet term a total derivative of?
added 1 characters in body
Apr
10
comment Does the mass point move?
Alfred Centauri, yes but it is equally impossible to exactly generate any kind of force, so to me this is as unrealistic as a sudden violent onset of a force at t=0, modelled by a step function. Realistically you will only be able to approximate it by forces that have some non zero time derivative at t=0.
Apr
10
awarded  Revival
Apr
9
answered What is the variation of Gauss-Bonnet term a total derivative of?
Apr
9
revised Does the mass point move?
added 159 characters in body
Apr
9
answered Does the mass point move?
Mar
29
comment Is space unending?
It is possible to describe a sphere intrinsically, without thinking of it as embedded in three dimensional space. Perhaps a better example would be the torus: The game world of some arcade video games like snake has that shape: If you leave the screen on one side, you reappear on the other side. This gives the example of a finite but unbounded two dimensional space.
Mar
10
awarded  Yearling
Dec
19
answered Is there a simple way to compute some physical constant from Feynman diagram statistics?
Dec
6
answered Why is the world sheet of an open string a cylinder?
Dec
3
answered Why do we study the scalar field in QFT when there is no such thing in nature?
Nov
30
awarded  Caucus
Nov
24
awarded  Scholar
Nov
24
accepted Spectrum of Free Strings
Oct
29
answered Is it possible to recover Classical Mechanics from Schrödinger's equation?
Oct
10
answered Differences between the gravitational constants $G$ and $g$?