Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation

Chen, Xingang ; Huang, Min-xin ; Kachru, Shamit ; Shiu, Gary

Stanford Linear Accelerator Center

关键词: Lagrangian Function;    Inflationary Universe;    Theory-Hep,Hepth;    Scalar Fields Theory-Hep,Hepth;    71 Classical And Quantum Mechanics, General Physics;   

DOI  :  10.2172/881956
RP-ID  :  SLAC-PUB-11840
RP-ID  :  AC02-76SF00515
RP-ID  :  881956

美国|英语

来源: UNT Digital Library

【 摘 要 】

We perform a general study of primordial scalar non-Gaussianities in single field inflationary models. We consider models where the inflaton Lagrangian is an arbitrary function of the scalar field and its first derivative, and the sound speed is arbitrary. We find that under reasonable assumptions, the non-Gaussianity is completely determined by 5 parameters. In special limits of the parameter space, one finds distinctive ''shapes'' of the non-Gaussianity. In models with a small sound speed, several of these shapes would become potentially observable in the near future. Different limits of our formulae recover various previously known results.