期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 9, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/09/015
关键词
inflation; primordial gravitational waves (theory)
资金
- Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy [EXC 2121, 390833306]
- ERC Starting Grant NewAve [638528]
- [18K03609]
- [17H06359]
- [201960698]
We point out that there is a high-frequency tail of the stochastic inflationary gravitational wave background that scales as f(-1/2 )with frequency f. This contribution comes from the graviton vacuum fluctuation amplified by the inflaton coherent oscillation during the reheating stage when the inflaton is weakly coupled and the perturbative reheating picture is valid. Although the signal is typically very small, such a high-frequency tail contains information on inflaton properties such as the inflaton mass as well as the thermal history of the early Universe.
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