Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP04(2018)083
Keywords
Classical Theories of Gravity; Effective Field Theories; Cosmology of Theories beyond the SM; Global Symmetries
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Funding
- STFC [ST/P000762/1]
- Royal Society through a Wolfson Research Merit Award
- European Union's Horizon 2020 Research Council [724659 MassiveCosmo ERC-2016-COG]
- Simons Foundation under the Simons Foundation's Origins of the Universe initiative [555326]
- Imperial College President's Fellowship
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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.
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