Improved positivity bounds and massive gravity

  • Claudia de Rham
  • Scott Melville
  • Andrew J. Tolley
Open Access
Regular Article - Theoretical Physics
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Abstract

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 Lagrangian for a weakly coupled UV completion of massive gravity which closely parallels the massive Galileon, and perform the power counting of corrections to the scattering amplitude and the positivity bounds. The Vainshtein mechanism which is central to the phenomenological viability of massive gravity is entirely consistent with weak coupling since it is classical in nature. We highlight that the only implication of the improved positivity constraints is that the EFT cutoff is lower than previous assumed, and discuss the observable implications, emphasizing that these bounds are not capable of ruling out the model contrary to previous statements in the literature.

Keywords

Classical Theories of Gravity Effective Field Theories Cosmology of Theories beyond the SM Global Symmetries 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Claudia de Rham
    • 1
    • 2
  • Scott Melville
    • 1
  • Andrew J. Tolley
    • 1
    • 2
  1. 1.Theoretical Physics, Blackett LaboratoryImperial CollegeLondonU.K.
  2. 2.CERCA, Department of PhysicsCase Western Reserve UniversityClevelandU.S.A.

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