Constraining primordial tensor features with the anisotropies of the cosmic microwave background

被引：2

作者：

Hamann, Jan ^{[1
]}

Malhotra, Ameek ^{[1
]}

机构：

[1] Univ New South Wales, Sch Phys, Sydney Consortium Particle Phys & Cosmol, Sydney, NSW 2052, Australia

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2022年 / 12期

关键词：

gravitational waves and CMBR polarization; Inflation and CMBR theory; CMBR experiments; INFLATIONARY UNIVERSE SCENARIO; GRAVITATIONAL-WAVES; PHASE-TRANSITION; GRAVITY-WAVES; POLARIZATION; SPECTRUM; PERTURBATIONS; FLUCTUATIONS; COSMOLOGY; SIGNATURE;

D O I：

10.1088/1475-7516/2022/12/015

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It is commonly assumed that the stochastic background of gravitational waves on cosmological scales follows an almost scale-independent power spectrum, as generically predicted by the inflationary paradigm. However, it is not inconceivable that the spectrum could have strongly scale-dependent features, generated, e.g., via transient dynamics of spec-tator axion-gauge fields during inflation. Using the temperature and polarisation maps from the Planck and BICEP/Keck datasets, we search for such features, taking the example of a log-normal bump in the primordial tensor spectrum at CMB scales. We do not find any evidence for the existence of bump-like tensor features at present, but demonstrate that fu-ture CMB experiments such as LiteBIRD and CMB-S4 will greatly improve our prospects of determining the amplitude, location and width of such a bump. We also highlight the role of delensing in constraining these features at angular scales t >= 100.

引用

页数：18

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