University of Cambridge > Talks.cam > DAMTP Friday GR Seminar > Acausality in Massive Gravity: Problems and (Attempted) Solutions

Acausality in Massive Gravity: Problems and (Attempted) Solutions

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I will discuss the problem of acausal signal propagation in the class of nonlinear massive gravity models recently constructed by de Rham, Gabadadze and Tolley. Though these models successfully maintain the correct number of degrees of freedom, and thus evade a generic pitfall of nonlinear massive gravities, I argue that acausality is an equally pressing issue that needs to be resolved. A few extensions to the model trying to circumvent this are presented, but the successful construction of a causal massive gravity theory is left as a challenge for the audience.

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

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