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Pi, S; Zhang, YL; Huang, QG; Sasaki, M6
Scalaron from R-2-gravity as a heavy field
AbstractWe study a model of inflation in which a scalar field chi is non-minimally coupled to Starobinsky's R-2 gravity. After transforming it to the Einstein frame, a new scalar field, the scalaron phi, will appear and couple to chi with a nontrivial field metric, while chi acquires a positive mass via the non-minimal coupling. Initially inflation occurs along the phi direction with chi trapped near its origin by this induced mass. After phi crosses a critical value, it starts rolling down rapidly and proceeds to damped oscillations around an effective local minimum determined by the value of chi, while inflation still continues, driven by the chi field at this second stage where the effect of the non-minimal coupling becomes negligible. The presence of the damped oscillations during the transition from the first to second stage of inflation causes enhancement and oscillation features in the power spectrum of the curvature perturbation. Assuming that the oscillations may be treated perturbatively, we calculate these features by using the delta N formalism, and discuss its observational implications to large scale CMB anomalies or primordial black hole formation, depending on the scale of the features.
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
Indexed BySCIE
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Cited Times:49[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys, Kyoto 6068502, Japan
2.Tokyo Univ Sci, Fac Sci, Dept Phys, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan
3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, 55 Zhong Guan Cun East St, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
5.Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, 36 Lushan Lu, Changsha 410081, Hunan, Peoples R China
6.Yangzhou Univ, Coll Phys Sci & Technol, Ctr Gravitat & Cosmol, 88 South Univ Ave, Yangzhou 225009, Jiangsu, Peoples R China
7.Kyoto Univ, Int Res Unit Adv Future Studies, Kyoto 6068502, Japan
Recommended Citation
GB/T 7714
Pi, S,Zhang, YL,Huang, QG,et al. Scalaron from R-2-gravity as a heavy field[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2018(5):42.
APA Pi, S,Zhang, YL,Huang, QG,&Sasaki, M.(2018).Scalaron from R-2-gravity as a heavy field.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(5),42.
MLA Pi, S,et al."Scalaron from R-2-gravity as a heavy field".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .5(2018):42.
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