期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2017/03/053
关键词
cosmological perturbation theory; physics of the early universe
资金
- Korea Ministry of Education, Science and Technology, Gyeongsangbuk-Do
- POSCO TJ Park Foundation
- National Research Foundation of Korea (NRF) [NRF-2016R1D1A1B03930408, NRF-2015R1A2A1A05001869]
- Pohang City for Independent Junior Research Groups at the Asia Pacific Center for Theoretical Physics
- [26.10619]
We consider a novel cosmological scenario in which a curvaton is long-lived and plays the role of cold dark matter (CDM) in the presence of a short, secondary inflation. Non-trivial evolution of the large scale cosmological perturbation in the curvaton scenario can affect the duration of the short term inflation, resulting in the inhomogeneous end of inflation. Non-linear parameters of the curvature perturbation are predicted to be fNL approximate to 5/4 and gNL approximate to 0. The curvaton abundance can be well diluted by the short-term inflation and accordingly, it does not have to decay into the Standard Model particles. Then the curvaton can account for the present CDM with the isocurvature perturbation being sufficiently suppressed because both the adiabatic and CDM isocurvature perturbations have the same origin. As an explicit example, we consider the thermal inflation scenario and a string axion as a candidate for this curvaton-dark matter. We further discuss possibilities to identify the curvaton-dark matter with the QCD axion.
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