ITP OpenIR  > SCI期刊论文
Reyimuajia, Yakefu; Zhang, Xinyi1,2,3
Natural inflation with a nonminimal coupling to gravity
AbstractAlthough natural inflation is a theoretically well-motivated model for cosmic inflation, it is in tension with recent Planck cosmic microwave background anisotropy measurements. We present a way to alleviate this tension by considering a very weak nonminimal coupling of the inflaton field to gravity in both contexts of metric and Palatini formulations of general relativity. We start our discussions with a generic form of the inflaton coupling to the Ricci scalar, then focus on a simple form to do phenomenological study. Our results show that such an extension can bring natural inflation's predictions to a good agreement with the Planck data. Depending on values of the coupling constant xi and the symmetry breaking scale f, we find that with vertical bar xi vertical bar similar to 10(-3) and f greater than or similar to 2.0M(pl) predictions of the model stay inside 68% CL allowed region until f increases up to 7.7M(pl), then only inside 95% CL region after f exceeds the latter value. The predictions from the metric and the Palatini theories are very similar due to the simple form of the coupling function we use and the small magnitude of the coupling xi. Successful reheating can also be realized in this model.
Cooperation Status国内
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
Indexed BySCIE
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
3.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Reyimuajia, Yakefu,Zhang, Xinyi. Natural inflation with a nonminimal coupling to gravity[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2021(3):59.
APA Reyimuajia, Yakefu,&Zhang, Xinyi.(2021).Natural inflation with a nonminimal coupling to gravity.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(3),59.
MLA Reyimuajia, Yakefu,et al."Natural inflation with a nonminimal coupling to gravity".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .3(2021):59.
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