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Interactions of Charged Spin-2 Fields
Claudia de Rham, Andrew Matas, Nicholas Ondo +1
In light of recent progress in ghost-free theories of massive gravity and multi-gravity, we reconsider the problem of constructing a ghost-free theory of an interacting spin-2 fiel…
Stable FLRW solutions in Generalized Massive Gravity
Claudia de Rham, Matteo Fasiello, Andrew J. Tolley
We present exact FLRW solutions in generalized massive gravity where the mass parameters are naturally promoted to Lorentz-invariant functions of the Stuckelberg fields. This new d…
A Positive Energy Theorem for P(X,phi) Theories
Benjamin Elder, Austin Joyce, Justin Khoury +1
We describe a positive energy theorem for Einstein gravity coupled to scalar fields with first-derivative interactions, so-called P(X,phi) theories. We offer two independent deriva…
How General Relativity and Lorentz Covariance Arise from the Spatially Covariant Effective Field Theory of the Transverse, Traceless Graviton
Justin Khoury, Godfrey E. J. Miller, Andrew J. Tolley
Traditional derivations of general relativity from the graviton degrees of freedom assume space-time Lorentz covariance as an axiom. In this essay, we survey recent evidence that g…
Generalized Galileon Duality
Claudia de Rham, Luke Keltner, Andrew J. Tolley
We generalize the Galileon duality to any single scalar field Lagrangian coupled locally to any matter field. Under the duality, a generalized Galileon maps into another generalize…