Large scale anomalies in the CMB and non-Gaussianity in bouncing cosmologies

被引：32

作者：

Agullo, Ivan ^{[1
]}

Kranas, Dimitrios ^{[1
]}

Sreenath, V ^{[2
]}

机构：

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] Natl Inst Technol Karnataka, Dept Phys, Mangalore 575025, India

来源：

CLASSICAL AND QUANTUM GRAVITY | 2021年 / 38卷 / 06期

关键词：

cosmic bounce; CMB; early Universe; MICROWAVE-ANISOTROPY-PROBE; WMAP OBSERVATIONS; INFLATION; ISOTROPY;

D O I：

10.1088/1361-6382/abc521

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose that several of the anomalies that have been observed at large angular scales in the CMB have a common origin in a cosmic bounce that took place before the inflationary era. The bounce introduces a new physical scale in the problem, which breaks the almost scale invariance of inflation. As a result, the state of scalar perturbations at the onset of inflation is no longer the Bunch-Davies vacuum, but it rather contains excitations and non-Gaussianity, which are larger for infrared modes. We argue that the combined effect of these excitations and the correlations between CMB modes and longer wavelength perturbations, can account for the observed power suppression, for the dipolar asymmetry, and it can also produce a preference for odd-parity correlations. The model can also alleviate the tension in the lensing amplitude A(L). We adopt a phenomenological viewpoint by considering a family of bounces characterized by a couple of parameters. We identify the minimum set of ingredients needed for our ideas to hold, and point out examples of theories in the literature where these conditions are met.

引用

页数：47

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