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Physics Stack Exchange users whose comments are worth studying include Lubos Motl and Ron Maimon (now at http://www.quora.com/Ron-Maimon and http://www.physicsoverflow.org/user/Ron+Maimon). Also see http://arxiv.org/abs/hep-ph/0207124 for a review of physics since the standard model.


Sep
9
answered How widespread is the meme “QM is counterintuitive” in academic physics?
Sep
8
comment Does physics address the topic of consciousness?
Schrodinger's point was that quantum mechanics is not a complete theory. And Penrose's physics of consciousness is in no way motivated by the Copenhagen interpretation, it's a type of spontaneous wavefunction collapse theory in which the collapse dynamics is noncomputable and makes it possible for the human brain to evade Godel's theorem. :-)
Sep
4
comment Does string/M-theory address higher-dimensional membrane vibration modes?
So that would be like a string vibrating in less than the critical dimension. But it's also possible that all the nongeometric phases actually are geometric if you find the right variables... There is a lot in string theory that is not yet understood.
Sep
4
comment Does string/M-theory address higher-dimensional membrane vibration modes?
It is possible for string theory, in this 1+1 dimensional form, to have nongeometric phases or nongeometric compactifications (just google those phrases for details), in which not all the worldsheet bosonic degrees of freedom are interpretable as spatial dimensions. So it seems to be possible to have a nongeometric phase in which less than the usual 9+1 dimensions exist as space, e.g. there might just be 3+1 dimensions, and then the remaining 6 bosons are nongeometric...
Sep
4
comment Does string/M-theory address higher-dimensional membrane vibration modes?
@Terry Bollinger... Along with the perspective of strings moving through space, string theory also has the worldsheet perspective, where you have a 1+1 dimensional space which is the interior of the string, and then N bosonic fields on the worldsheet which correspond to the dimensions of the background space in the usual picture, and finally enough fermionic fields to cancel the conformal anomaly on the worldsheet...
Aug
26
asked Baryon masses in Wetterich's new cosmology
Aug
24
comment Does an antiDeSitter space compensate the vacuum energy?
I think I can say this much about the "details" of "H", that it comes from closed-string gravitons coupling to open strings that connect the two parallel antibrane stacks of the scenario. (These "open strings of the gap" would produce SM yukawa couplings by interacting with e.g. other open strings existing at nearby brane-stack intersections; see braneworld models of Ibanez, Marchesano et al.)
Aug
23
revised Does an antiDeSitter space compensate the vacuum energy?
link
Aug
23
answered Does an antiDeSitter space compensate the vacuum energy?
Aug
20
comment Usefulness of SUSY models when it cannot exist at any non-zero temperature
Real-world susy theories don't rely on this effect to break supersymmetry. Real-world susy is supposed to be broken by other effects, e.g. see arxiv.org/abs/hep-th/0509029
Aug
13
comment Newtonian gravity from the holographic principle?
Related: arxiv.org/abs/1308.1977 section 2, "Holography in pseudo-Newtonian gravity"
Aug
11
answered Does string/M-theory address higher-dimensional membrane vibration modes?
Aug
10
awarded  Nice Question
Aug
7
comment Born's Rule, What is the Reason?
But no-one cares about the details of this "Oxford school of MWI" except other philosophers, so detailed rebuttals remain buried in obscure papers, while MWI fans can say "Deutsch derived the Born rule" while relying on nothing more than hearsay.
Aug
7
comment Born's Rule, What is the Reason?
In other words, it must be rational to make choice X, "therefore" relevant outcomes A, B and C must have certain physical probabilities. Even without seeing the details of the argument, it should be apparent that this is nonsense...
Aug
7
comment Born's Rule, What is the Reason?
Thus the decision-theoretic model of rationality builds on a simpler notion of probability. Deutsch's derivation of the Born rule, consists of starting with an apriori model of how to choose rationally in the multiverse, and then working backwards to obtain the probabilities...
Aug
7
comment Born's Rule, What is the Reason?
Deutsch's "derivation" is nonsensical... There is a definition of rational behavior according to which the rational choice is that which maximizes your "expected utility". The utility of an outcome is the payoff you obtain from that outcome, and then the expected utility of a choice, is obtained by considering all the possible outcomes that might arise from a choice, and then giving them each a weight which is (utility of the outcome) x (probability of the outcome)...
Aug
6
comment Running of gauge couplings in the Standard Model
"This question appears to be off-topic". But it's still amusing. :-)
Aug
5
comment Why is the Higgs boson created so infrequently at the CERN collider?
physics.upenn.edu/~thomsone/why.html
Aug
2
comment What is currently incomplete in M-theory?
There is also an AdS7 case, where it's a stack of M5-branes and no-one knows the dual field theory, but it is presumably some form of "(2,0) theory".