| |||||||
ShanghaiTech University Knowledge Management System
Generalized non-local R2-like inflation | |
2023-07-20 | |
状态 | 已发表 |
摘要 | The R2 inflation which is an extension of general relativity (GR) by quadratic scalar curvature introduces a quasi-de Sitter expansion of the early Universe governed by Ricci scalar being an eigenmode of d’Alembertian operator. In this paper, we derive a most general theory of gravity admitting R2 inflationary solution which turned out to be higher curvature non-local extension of GR. We study in detail inflationary perturbations in this theory and analyse the structure of form-factors that leads to a massive scalar (scalaron) and massless tensor degrees of freedom. We argue that the theory contains only finite number of free parameters which can be fixed by cosmological observations. We derive predictions of our generalized non-local R2-like inflation and obtain the scalar spectral index ns â 1â 2/N and any value of the tensor-to-scalar ratio r < 0.036. In this theory, tensor spectral index can be either positive or negative nt â ¶ 0 and the well-known consistency relation r = â 8nt is violated in a non-trivial way. We also compute running of the tensor spectral index and discuss observational implications to distinguish this model from several classes of scalar field models of inflation. These predictions allow us to probe the nature of quantum gravity in the scope of future CMB and gravitational wave observations. Finally we comment on how the features of generalized non-local R2-like inflation cannot be captured by established notions of the so-called effective field theory of single field inflation and how we must redefine the way we pursue inflationary cosmology. |
关键词 | Models of Quantum Gravity Cosmology of Theories beyond the SM |
DOI | arXiv:2209.02515 |
相关网址 | 查看原文 |
出处 | Arxiv |
WOS记录号 | PPRN:74071185 |
WOS类目 | Astronomy& Astrophysics ; Physics, Multidisciplinary ; Physics, Particles& Fields |
资助项目 | FCT Portugal[ |
文献类型 | 预印本 |
条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/381392 |
专题 | 物质科学与技术学院 物质科学与技术学院_PI研究组_Alexey S. Koshelev组 |
通讯作者 | Koshelev, Alexey S. |
作者单位 | 1.Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.Univ Beira Interior, Ctr Matemat & Aplicacoes CMA UBI, Dept Fis, P-6200 Covilha, Portugal 3.Tokyo Inst Technol, Dept Phys, 2-12-1 Ookayama,Meguro ku, Tokyo 1528551, Japan 4.Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg,Burnaby Rd, Portsmouth PO1 3FX, Hants, England 5.L D Landau Inst Theoret Phys RAS, Chernogolovka 142432, Moscow, Russia 6.Kazan Fed Univ, Kazan 420008, Russia |
推荐引用方式 GB/T 7714 | Koshelev, Alexey S.,Kumar, K.Sravan,Starobinsky, Alexei A.. Generalized non-local R2-like inflation. 2023. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 |
修改评论
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。