Informal HEP Journal club: Holographic Ward identities of symmetry breaking
5 December 2016 13:00 in CM219
In any QFT, explicit and spontaneous breakings of a global symmetry correspond to specific Ward identities among correlators, which can be derived in a very general fashion. We retrieve these identities in a minimal AdS/CFT setup, thanks to holographic renormalization. The same story holds, even if with some interesting subtleties, also in two boundary dimensions, showing the breakdown of Coleman theorem in the strict large N limit. We provide as well some explicit analytic solutions, for 3 and 2 dimensions, which exhibit the gapless Goldstone pole in the scalar two-point function.
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