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Gravitational positivity bounds

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arxiv 2007.15009 v2 pith:LYDHN6BG submitted 2020-07-29 hep-th gr-qc

Junsei Tokuda , Katsuki Aoki , Shin'ichi Hirano This is my paper
classification hep-thgr-qc
keywords positivityboundsscaleallowedalphaamplitudebehaviorregge
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study the validity of positivity bounds in the presence of a massless graviton, assuming the Regge behavior of the amplitude. Under this assumption, the problematic $t$-channel pole is canceled with the UV integral of the imaginary part of the amplitude in the dispersion relation, which gives rise to finite corrections to the positivity bounds. We find that low-energy effective field theories (EFT) with "wrong" sign are generically allowed. The allowed amount of the positivity violation is determined by the Regge behavior. This violation is suppressed by $M_{\rm pl}^{-2}\alpha'$ where $\alpha'$ is the scale of Reggeization. This implies that the positivity bounds can be applied only when the cutoff scale of EFT is much lower than the scale of Reggeization. We then obtain the positivity bounds on scalar-tensor EFT at one-loop level. Implications of our results on the degenerate higher-order scalar-tensor (DHOST) theory are also discussed.

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Cited by 6 Pith papers

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