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Coset Constructions and Modified Gravity

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Historically, it was notoriously difficult to construct a theory of massive gravity (mGR) and only in the last decade or so have some of its subtle facets become well understood. Many of the peculiarities, problems and features of mGR stem from the longitudinal mode which utilizes higher derivative “galileon” interactions. Galileons have many interesting properties and I will start by discussing their interpretation as Goldstone modes arising from the spontaneous breaking of spacetime symmetries and their appearance as Wess-Zumino terms in the coset construction, the familiar tool for constructing EFTs for systems displaying spontaneously broken symmetries. Following this, I will use the same coset construction tools to build the full, ghost free dRGT theory of mGR.

This talk is part of the DAMTP Friday GR Seminar series.

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