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11 papers · 2 filters
Eikonal Scattering and Asymptotic Superluminality of Massless Higher Spin Fields
Kurt Hinterbichler, Austin Joyce, Rachel A. Rosen
We consider scattering of massless higher-spin particles in the eikonal regime in four dimensions. By demanding the absence of asymptotic superluminality, corresponding to positivi…
Massive and Massless Spin-2 Scattering and Asymptotic Superluminality
James Bonifacio, Kurt Hinterbichler, Austin Joyce +1
We constrain theories of a massive spin-2 particle coupled to a massless spin-2 particle by demanding the absence of a time advance in eikonal scattering. This is an -matrix con…
Caustic Formation upon Shift Symmetry Breaking
Klaountia Pasmatsiou
We examine how the breaking of shift symmetry affects the formation of caustics for the standard canonical kinetic theory as well as for the DBI theory. We show in this case, that…
Improved Positivity Bounds and Massive Gravity
Claudia de Rham, Scott Melville, Andrew J. Tolley
Theories such as massive Galileons and massive gravity can satisfy the presently known improved positivity bounds provided they are weakly coupled. We discuss the form of the EFT L…
Massive Spin-2 Scattering and Asymptotic Superluminality
Kurt Hinterbichler, Austin Joyce, Rachel A. Rosen
We place model-independent constraints on theories of massive spin-2 particles by considering the positivity of the phase shift in eikonal scattering. The phase shift is an asympto…
Was the Universe Actually Radiation Dominated Prior to Nucleosynthesis?
John T. Giblin, Gordon Kane, Eva Nesbit +2
Maybe not. String theory approaches to both beyond the Standard Model and Inflationary model building generically predict the existence of scalars (moduli) that are light compared…