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Einstein Gravity, Massive Gravity, Multi-Gravity and Nonlinear Realizations
Garrett Goon, Kurt Hinterbichler, Austin Joyce +1
The existence of a ghost free theory of massive gravity begs for an interpretation as a Higgs phase of General Relativity. We revisit the study of massive gravity as a Higgs phase.…
Beyond the Cosmological Standard Model
Austin Joyce, Bhuvnesh Jain, Justin Khoury +1
After a decade and a half of research motivated by the accelerating universe, theory and experiment have a reached a certain level of maturity. The development of theoretical model…
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…
Spontaneously Broken Gauge Theories and the Coset Construction
Garrett Goon, Austin Joyce, Mark Trodden
The methods of non-linear realizations have proven to be powerful in studying the low energy physics resulting from spontaneously broken internal and spacetime symmetries. In this…
Goldstones with Extended Shift Symmetries
Kurt Hinterbichler, Austin Joyce
We consider scalar field theories invariant under extended shift symmetries consisting of higher order polynomials in the spacetime coordinates. These generalize ordinary shift sym…