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Ye, Gen; Piao, Yun-Song
Positivity in the effective field theory of cosmological perturbations
AbstractRequiring the existence of a unitary, causal and local UV-completion places a set of positivity bounds on the corresponding effective field theories (EFTs). We discuss the obstructions and possibility in applying the positivity bound to cosmology, in particular the EFT of cosmological perturbations. Taking a cT = 1 beyond-Horndeski EFT as an illustrative example, we derive such bounds, which incorporate the cosmological correction of order H2/ 2, being the cutoff scale. The derived bounds are applied to slow-roll inflation with beyond Horndeski operators. It is found that the cosmological positivity bounds may be either stronger or weaker than their flat space counterpart.
Cooperation Status国内
Subject AreaPhysics
MOST Discipline CataloguePhysics, Particles & Fields
Indexed BySCIE
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Document Type期刊论文
Affiliation1.[Ye, Gen
2.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Ye, Gen,Piao, Yun-Song. Positivity in the effective field theory of cosmological perturbations[J]. EUROPEAN PHYSICAL JOURNAL C,2020,80(5):421.
APA Ye, Gen,&Piao, Yun-Song.(2020).Positivity in the effective field theory of cosmological perturbations.EUROPEAN PHYSICAL JOURNAL C,80(5),421.
MLA Ye, Gen,et al."Positivity in the effective field theory of cosmological perturbations".EUROPEAN PHYSICAL JOURNAL C 80.5(2020):421.
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