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I am a postdoc in mathematics, but have my degree in theoretical physics. My work is about mathematical structures motivated from quantum field theory and string theory. For more see my personal web on the nLab.


Jul
15
comment About the stability of the ground state of the bosonic string
I wouldn't say so. Also the closed string tachyon condensation has been studied with avail, and better understood, if admittedly less so than the open string tachyon. A list of references is here ncatlab.org/nlab/show/tachyon#ReferencesInStringTheory .
Jul
14
revised About the stability of the ground state of the bosonic string
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Jul
14
answered About the stability of the ground state of the bosonic string
Jul
14
answered How exactly are Calabi-Yau compactifications done?
Jul
13
revised String Theory and Standard Model in CERN
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Jul
13
answered String Theory and Standard Model in CERN
Jul
13
revised What is the relationship between string theory and quantum field theory?
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Jul
13
answered What is the relationship between string theory and quantum field theory?
Jul
13
comment String theory and the SM spectrum
@Michael Brown, yes, I think back in the 20th century many hopes were just as irrational as many supposed debunkings are these days. It would be good if the grander theoretical physics community had a better sense of the logical foundations of its subject, such as to then be able to make objective, substantive judgements. Much of the criticism of string theory is based on confusion already about QFT (such as the common "string theory doesn't work because the perturbation series does not converge" or "because it doesn't have a unique vacuum").
Jul
12
comment String theory and the SM spectrum
It's not about being a "fan" or a "stringer". It's about logical reasoning in science. String theory might be wrong, but not because it has more than one vacuum and not because it doesn't uniquely predict the observed elementary mass spectrum. That's not a logically sensible criticism. You might as well complain that it doesn't predict your telephone number. I would like to see people concentrate and have decent arguments about string theory. Feel free to try to trash it, that's what science is about, but know some good reasons.
Jul
12
awarded  Editor
Jul
12
revised String theory and the SM spectrum
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Jul
12
answered String theory and the SM spectrum
Jul
12
comment String theory and the SM spectrum
Why do you even believe that mass ratios can be derived from first principles? Kepler thought for a while the ratios of the distances of the planets could be derived from first principles. That was wrong, too.
Jul
10
comment The divergence in QCD Series— How many are they, and what do they mean?
To amplify drake's answer to Graviton's question from the opposite angle: an asymptotic series can well be the perturbative expansion of a non-pertrubatively defined fundamental theory of nature. Having the asymptotic perturbation series is not yet having the "fundamental theory", but it can be a step in that direction.
Jul
7
awarded  Announcer
Jul
5
comment Realization of Witten-type topological quantum field theory in condensed matter physics
Well, the Landau-Ginzburg theory is an old model for superconductivity and the behaviour of its potential term is what gives the Landau-Ginzburg model its name. But yeah, otherwise the relation is not super-close, I agree.
Jul
5
awarded  Revival
Jul
5
answered Realization of Witten-type topological quantum field theory in condensed matter physics
Jul
5
answered What object is quantized in quantum gravity?