Abstract
We study viable small-field Coleman-Weinberg (CW) inflation models with the help of nonminimal coupling to gravity. The simplest small-field CW inflation model (with a low-scale potential minimum) is incompatible with the cosmological constraint on the scalar spectral index. However, there are possibilities to make the model realistic. First, we revisit the CW inflation model supplemented with a linear potential term. We next consider the CW inflation model with a logarithmic nonminimal coupling and illustrate that the model can open a new viable parameter space that includes the model with a linear potential term. We also show parameter spaces where the Hubble scale during the inflation can be as small as 10-4 GeV, 1 GeV, 104 GeV, and 108 GeV for the number of e-folds of 40, 45, 50, and 55, respectively, with other cosmological constraints being satisfied.
| Original language | English |
|---|---|
| Article number | 063004 |
| Journal | Physical Review D |
| Volume | 97 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2018 Mar 15 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Very low scale Coleman-Weinberg inflation with nonminimal coupling. / Kaneta, Kunio; Seto, Osamu; Takahashi, Ryo.
In: Physical Review D, Vol. 97, No. 6, 063004, 15.03.2018.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Very low scale Coleman-Weinberg inflation with nonminimal coupling
AU - Kaneta, Kunio
AU - Seto, Osamu
AU - Takahashi, Ryo
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PRVDAQ 2470-0010 10.1103/PhysRevD.96.064036 Publisher Copyright: © 2018 authors. Published by the American Physical Society.
PY - 2018/3/15
Y1 - 2018/3/15
N2 - We study viable small-field Coleman-Weinberg (CW) inflation models with the help of nonminimal coupling to gravity. The simplest small-field CW inflation model (with a low-scale potential minimum) is incompatible with the cosmological constraint on the scalar spectral index. However, there are possibilities to make the model realistic. First, we revisit the CW inflation model supplemented with a linear potential term. We next consider the CW inflation model with a logarithmic nonminimal coupling and illustrate that the model can open a new viable parameter space that includes the model with a linear potential term. We also show parameter spaces where the Hubble scale during the inflation can be as small as 10-4 GeV, 1 GeV, 104 GeV, and 108 GeV for the number of e-folds of 40, 45, 50, and 55, respectively, with other cosmological constraints being satisfied.
AB - We study viable small-field Coleman-Weinberg (CW) inflation models with the help of nonminimal coupling to gravity. The simplest small-field CW inflation model (with a low-scale potential minimum) is incompatible with the cosmological constraint on the scalar spectral index. However, there are possibilities to make the model realistic. First, we revisit the CW inflation model supplemented with a linear potential term. We next consider the CW inflation model with a logarithmic nonminimal coupling and illustrate that the model can open a new viable parameter space that includes the model with a linear potential term. We also show parameter spaces where the Hubble scale during the inflation can be as small as 10-4 GeV, 1 GeV, 104 GeV, and 108 GeV for the number of e-folds of 40, 45, 50, and 55, respectively, with other cosmological constraints being satisfied.
UR - http://www.scopus.com/inward/record.url?scp=85044823932&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevD.97.063004
DO - 10.1103/PhysRevD.97.063004
M3 - Article
AN - SCOPUS:85044823932
SN - 2470-0010
VL - 97
JO - Physical Review D
JF - Physical Review D
IS - 6
M1 - 063004
ER -