期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/01/041
关键词
cosmological perturbation theory; inflation
资金
- GRF [16301917]
- ECS [26300316]
- Hong Kong PhD Fellowship Scheme (HKPFS)
- Targeted Scholarship Scheme under the HKSAR Government Scholarship Fund
- MEXT KAKENHI [15H05888]
- [HKUST4/CRF/13G]
- Grants-in-Aid for Scientific Research [15H05888] Funding Source: KAKEN
We study the power spectrum of quasi-single field inflation where strong coupling is considered. The contribution from the massive propagator can be divided into local and non-local contributions. The local one is the leading contribution and is power-law suppressed as a function of mass, while the non-local contribution is exponentially suppressed in the large mass limit. For the local contribution, it is possible to use the effective field theory approach to study the power spectrum in the strongly coupled region of the parameter space. For the non-local contribution, we developed a partial effective field theory method to simplify the calculation: when there are multiple massive propagators, one can fully compute it after integrating out all but one massive propagator by effective field theory. The result retains the standard clock signal, which is interesting for probing the expansion history of the primordial universe and the physics of a cosmological collider. The error involved compared to the full calculation is power law suppressed by the effective mass of the heavy field.
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