Dark radiation and inflationary freedom

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Gariazzo, Stefano^1

Department of Physics, University of Torino, INFN, Sezione di Torino, Via P. Giuria 1, Torino

I-10125, Italy^1

关键词: Cosmic microwave backgrounds;    Cosmological measurements;    Power-law;    Sterile neutrinos;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/3/032006/pdf
DOI  :  10.1088/1742-6596/718/3/032006

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

A relaxed primordial power spectrum (PPS) of scalar perturbations arising from inflation can impact the dark radiation constraints obtained from Cosmic Microwave Background and other cosmological measurements. If inflation produces a non-standard PPS for the initial fluctuations, a fully thermalized light sterile neutrino can be favoured by CMB observations, instead of being strongly disfavoured. In the case of a thermal axion, the constraints on the axion mass are relaxed when the PPS is different from the standard power law. Based on Refs. [1, 2].