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A class of theories that attempt to explain all existing particles (including force carriers) as vibrational modes of extended objects, such as the 1-dimensional fundamental string. PLEASE DO NOT USE THIS TAG for non-relativistic material strings, such as, e.g., a guitar string.

5 votes
0 answers
165 views

What role does SUSY play in gauge/gravity duality?

This question arises in my project of finding the conformal field theory dual to the bosonic part of the Yang-Mills theory, i.e. non-supersymmetric large $N$ YM theory. Supersymmetry is a constant set …
2 votes
0 answers
94 views

What's the physics on the boundary of a D-brane?

First of all, I'm not sure if a D-brane can have a boundary? Naively, I can imagine under certain background potential(from NS B field or RR field), at the "D-brane boundary," the open strings could e …
7 votes
1 answer
356 views

Spinor representation restricted under subgroup, a formula from Polchinski

The question is about the spinor representation decomposed under subgroups. It's a common technique in string theory when parts of dimensions are compactified and ignored, and we are only interested i …