Tagged Questions

2
votes
1answer
401 views

Is anti-gravity possible in theoretical physics?

Is anti-gravity http://en.wikipedia.org/wiki/Anti-gravity possible in string theory? I have read some articles about scientists making assumptions about the existence of anti-gravity, but is it ...
0
votes
1answer
89 views

Entropy, Mass and Brane gravity

Does string theory state as vibrational entropy increases, mass increases? Related: What is a D-brane? Reference: Cambridge Relativity
0
votes
1answer
179 views

advantage of string theory over other theory-of-everything candidates

I am getting curious over why string theory, especially M-theory, is the most popular candidate for the theory of everything. It seems that all candidates of the theory of everything lack substantial ...
1
vote
2answers
156 views

$2+1$ dimensional physics theory of our universe?

Is there any physics theory that depicts our universe as $2+1$ dimensional? I heard that black holes seem to suggest that the world might be $2+1$ dimensional, so I am curious whether such theory ...
1
vote
1answer
217 views

Why *should* the mass of elementary particles theoretically be of the magnitude of the Planck mass?

Why should the mass of elementary particles be theoretically of the magnitude of the Planck mass? I've read that already a few times but I don't understand why it should be that way. For example: ...
4
votes
2answers
452 views

Critics of Mannheim's Conformal Gravity Theory?

I'm looking for more articles/reactions/critiques/support for Philip Mannheim's recent conformal gravity theory. See here: http://arxiv.org/abs/1101.2186v1 Any ideas on where to start?
2
votes
1answer
609 views

Why Is String Theory Called A Theory [duplicate]

Possible Duplicate: Laws of Atomic Theory - how is this possible? Generally in science, a theory is effectively a fact. The theory of evolution is not a guess, or a hypothesis. It's ...