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Seminars this week in series RENC-THEO
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Thursday 21 September 2017, 10:00 at IHP, Room 314 RENC-THEO (Rencontres Théoriciennes) hep-th
James Drummond ( Southampton University ) Quantum gravity from conformal field theory
Abstract: I will describe how to recast perturbative quantum gravity using non-perturbative techniques from conformal field theory, focussing on the case of N=4 super Yang-Mills theory. By resolving the degeneracy among double trace operators at large N we are able to bootstrap one-loop supergravity corrections from the OPE of the CFT.

Thursday 21 September 2017, 11:45 at IHP, Room 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Miguel Paulos ( LPTENS ) The S-matrix strikes back
Abstract: In this talk I will describe recent work aiming to reinvigorate the 50 year old S-matrix program, which seeks to constrain scattering of massive particles non-perturbatively. I will begin by considering quantum fields in anti-de Sitter space and show that one can extract information about the S-matrix by considering correlators in conformally invariant theories. The latter can be studied with "bootstrap" techniques, which allow us to constrain the S-matrix. I will also show that this can be done directly, without using the CFT crutch, by using crossing symmetry and unitarity and a particular ansatz. In this way we derive universal bounds on QFTs in 2,3 and 4 dimensions.

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