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I used to check every question here but not any more. Physics Overflow, which was built from the archives of a defunct "Theoretical Physics Stack Exchange", seems more promising as a place for advanced physics Q&A.


Aug
31
comment M-theory and Mathematics
If a D-brane exists, it exists. What would make its existence qualitatively different to the existence of everyday objects like those you list?
Aug
30
comment A few questions about gravity
As for what causes gravity in M-theory, both pictures are available but ultimately some third perspective to do with holographic emergence of space is probably more fundamental. I have to sleep now. Good night
Aug
30
comment A few questions about gravity
Maybe you could if you were Riemann ... But historically it went the other way, mimicking GR with QFT
Aug
30
comment A few questions about gravity
In QFT, classical field states are mimicked by en.m.wikipedia.org/wiki/Coherent_states ... Classical space-time curvature should equal coherent state of gravitons
Aug
30
comment A few questions about gravity
Curved space metric can be described as flat space metric plus an extra field. This extra field that quantifies local deviation from flatness is the graviton field.
Aug
30
comment A few questions about gravity
Dilaton is an example of en.m.wikipedia.org/wiki/Scalar-tensor_theory ... Dilaton field strength equals radius of M-theory 11th dimension
Aug
30
comment A few questions about gravity
Damon, these people have treated you contemptibly. They should be ashamed.
Aug
29
answered Is there any $SU(\infty)$ gauge theory in quantum field theory?
Aug
26
awarded  string-theory
Aug
25
answered Quantum computers for string theory?
Aug
8
asked Scale relativity vs scale invariance
Jul
5
answered Why didn't we have inflation when the theory of everything and GUTS broke symmetry?
Jun
4
comment What laws are the same in all string theory compactifications?
This question should not be closed.
May
27
comment Does the holographic principle for black holes mean that information is cloned?
Let us continue this discussion in chat.
May
24
answered Could M-Theory explain dark matter as well as dark energy?
May
16
comment Could M-Theory explain dark matter as well as dark energy?
@HDE 226868 Actually, you don't know that. They may be related, they may not be.
May
10
comment What does it mean physically if pentagon identity or hexagon identity doesn't have any answers?
@CuriousOne the question is in the title. I interpret it as asking whether all solutions to the fusion rules must obey those identities.
May
5
comment What is the property of neutrino?
The spin and momentum of a particle are affected by other interactions too, Z boson and photon don't have a special role there.
May
5
comment Why do we need complex representations in Grand Unified Theories?
I am a bit puzzled about the relation between this argument and Edward's... is one more fundamental than the other. Further thought required.
May
5
comment Why do we need complex representations in Grand Unified Theories?
If $\psi$ is real, then a term of the form $m \psi^* \psi$ should automatically exist - whereas, if $\psi$ is complex, that term exists only if a separate, complex-conjugate field is part of the theory. And then I think naturalness is used to argue that the coefficient will be large enough to matter.