Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/06/016
Keywords
cosmological perturbation theory; inflation; physics of the early universe
Funding
- Communidad de Madrid Atraccion de Talento investigador [2017-T1/TIC-5305]
- MICINN (Spain) [PID2019-107394GB-I00]
- JSPS KAKENHI [19H01899, 21H01107, 17H01131, 19K03874]
- MEXT KAKENHI [19H05110]
- Grants-in-Aid for Scientific Research [19H01899, 21H01107] Funding Source: KAKEN
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Double inflation can occur when a spectator field is non-minimally coupled to gravity. The non-minimal coupling results in the growth of the spectator field, which drives the second stage of inflation in a significant region of parameter space. The non-minimal coupling of the spectator field can modify the predictions for the spectral index and the tensor-to-scalar ratio.
We argue that double inflation may occur when a spectator field is non-minimally coupled to gravity. As a concrete example, we study a two-field inflationary model where the initial spectator field is non-minimally coupled to gravity while the initial inflaton field is minimally coupled. The non-minimal coupling results in the growth of the spectator field which, in turn, drives the second stage of inflation in a significant region of parameter space. The isocurvature fluctuations originating from the spectator field source adiabatic ones, and hence the spectator non-minimal coupling can modify the inflationary predictions for the spectral index and the tensor-to-scalar ratio even though the initial inflaton field is minimally coupled to gravity. We explicitly show that quadratic chaotic inflation can become viable by the introduction of the spectator non-minimal coupling.
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