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seen Nov 10 '11 at 18:49

Mar
2
revised Question about associative 3-cycles on G2 manifolds
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Mar
2
revised Number of dimensions in string theory and possible link with number theory
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Mar
2
revised What restricts the value of weak hypercharge from being 5/3?
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Mar
2
revised If we are willing to accept tachyonic string modes, are there valid projections other than the GSO projections?
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Mar
2
revised How much can AdS/CMT tell us?
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Mar
2
revised What mechanism in string theory enforces the consistency of self-couplings of massless vector bosons?
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Feb
26
answered How much can AdS/CMT tell us?
Feb
22
revised What mechanism in string theory enforces the consistency of self-couplings of massless vector bosons?
Removed inappropriate personal comments.
Feb
22
answered What mechanism in string theory enforces the consistency of self-couplings of massless vector bosons?
Feb
22
comment Spinning Tachyons
I agree with Lubos too. ;)
Feb
21
comment Spinning Tachyons
@truebeliever Have a look at the following paper and papers that cite it. As I recall, some of what they found in this paper was later reinterpreted by Sen&Zwiebach in terms of decay of unstable D-branes. The stuff on Lorentz violation probably involves an uncontrolled approximation and as far as I know has not been backed up by later studies. Still, the idea is intersting. Spontaneous Breaking of Lorentz Symmetry in String Theory. V.Alan Kostelecky, (Indiana U.) , Stuart Samuel, (City Coll., N.Y.) . IUHET-139, CCNY-HEP-88/4, May 1988. 8pp. Published in Phys.Rev.D39:683,1989.
Feb
21
comment Spinning Tachyons
Is it clear that this must be true in string theory with an infinite tower of spin one and higher spin states? There have been speculations about Lorentz violation appearing in Open String Field Theory through condensation of vector states, but I don't think any computations have shown that this actually happens in a well controlled approximation.
Feb
20
answered If we are willing to accept tachyonic string modes, are there valid projections other than the GSO projections?
Feb
18
comment What restricts the value of weak hypercharge from being 5/3?
@Carl No thank you to me is needed. I guess you could thank physics stackexchange though. I know at Math Overflow they have a protocol for citing the site.
Feb
18
awarded  Enthusiast
Feb
17
comment Why should the mass of leptons to be near of proton and QCD/chiral scales?
The electron is massless in the SM before gauge symmetry breaking and then acquires a mass proportional to a Yukawa coupling and the Higgs vev. You can't just ignore this and start talking about E&M self-energy. You're discussing the QFT of the 1930's.
Feb
17
accepted Scale dependence of energy dissipation in viscous flow via AdS/CFT
Feb
16
comment Are neutrinos Majorana particles?
This is a pretty confusing and/or deceptive quote because as Lubos explains, you can give masses to neutrinos in a very simple way with a slight extension of the Standard Model. It doesn't require extra dimensions. Not sure what they mean by the "sacred distinction" between matter and anti-matter. We already know both C and CP are violated. The only thing sacred is CPT and you certainly don't need CPT violation to explain neutrino masses either.
Feb
16
comment Scale dependence of energy dissipation in viscous flow via AdS/CFT
Thanks @Daniel Grumiller. Those references look very helpful.
Feb
16
revised What restricts the value of weak hypercharge from being 5/3?
fixed reference