Improved positivity bounds and massive gravity
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Publication:1641751
DOI10.1007/JHEP04(2018)083zbMATH Open1390.83302arXiv1710.09611OpenAlexW2765219784MaRDI QIDQ1641751
Author name not available (Why is that?)
Publication date: 19 June 2018
Published in: (Search for Journal in Brave)
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 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.
Full work available at URL: https://arxiv.org/abs/1710.09611
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