Non-Gaussianities in generalized non-local R2-like inflation
2023-07-17
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摘要

In [1], a most general higher curvature non-local gravity action was derived that admits a particular R2-like inflationary solution predicting the spectral index of pri-mordial scalar perturbations ns(N) â 1 â 2/N, where N is the number of e-folds before the end of inflation, N â « 1, any value of the tensor-to-scalar ratio r(N) < 0.036 and the tensor tilt nt(N) violating the r = â 8nt condition. In this paper, we compute scalar primordial non-Gaussianities (PNGs) in this theory and effectively demonstrate that higher curvature non-local terms lead to reduced bispectrum fNL (k1, k2, k3) mimicking several classes of scalar field models of inflation known in the literature. We obtain |fNL|â ¼O (1 â 10) in the equilateral, orthogonal, and squeezed limits and the running of these PNGs measured by the quantity |d ln fkL /d ln k | â ² 1. Such PNGs are sufficiently large to be measurable by future CMB and Large Scale Structure observations, thus providing a possibility to probe the nature of quantum gravity. Furthermore, we demonstrate that the R2-like inflation in non-local modification of gravity brings non-trivial predictions which go beyond the current status of effective field theories (EFTs) of single field, quasi-single field and multiple field inflation. A distinguishable feature of non-local R2-like inflation compared to local EFTs is that we can have running of PNGs at least an order of magnitude higher. In summary, through our generalized non-local R2-like inflation, we obtain a robust geometric framework of inflation that can explain any detection of observable quantities related to scalar PNGs.

关键词Models of Quantum Gravity Cosmology of Theories beyond the SM
DOIarXiv:2210.16459
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出处Arxiv
WOS记录号PPRN:73948804
WOS类目Astronomy& Astrophysics ; Physics, Multidisciplinary ; Physics, Particles& Fields
资助项目FCT Portugal investigator project[
文献类型预印本
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/381387
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.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
2.Univ Beira Interior UBI, Ctr Matemat & Aplicacoes CMA, 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, England
5.RAS, LD Landau Inst Theoret Phys, 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.. Non-Gaussianities in generalized non-local R2-like inflation. 2023.
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