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University of Cambridge > Talks.cam > DAMTP Friday GR Seminar > Towards the exact de Sitter S-matrix of the Principal Chiral Model

## Towards the exact de Sitter S-matrix of the Principal Chiral ModelAdd to your list(s) Download to your calendar using vCal - Ian Morrison (DAMTP)
- Friday 24 May 2013, 13:00-14:00
- Pavilion B Potter Room (B1.19).
If you have a question about this talk, please contact Dr Joan Camps. In Minkowski space the S-matrix in an invaluable tool for analysing quantum field theories. Scattering matrices may also be constructed and exploited in eternally inflating spacetimes. In the first part of this talk I will review the perturbative construction of the S-matrix in global de Siter space. I will emphasize it’s value as a gauge and field redefinition-invariant probe for QFTs in the inflationary setting. As time allows I will also discuss features of such QFTs which, while obscure from the vantage point of local correlation functions, are transparent when viewed through the S-matrix. In the second part of my talk I will discuss recent progress towards constructing the exact S-matrix of the Principal Chiral Model (PCM) in de Sitter space. The PCM is a 2-dimensional non-linear sigma model endowed with many of the mature attributes of QCD , including asymptotic freedom and dimensional transmutation. The PCM also contains an infinite number of hidden symmetries which make the theory integrable in Minkowski space. A sufficient number of these symmetries exist also in the de Sitter theory, and thus the de Sitter S-matrix may be determined up to a CDD -type ambiguity. This talk is part of the DAMTP Friday GR Seminar series. ## This talk is included in these lists:- All CMS events
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