Secret neutrino interactions: a pseudoscalar model

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Archidiacono, Maria^1,2 ; Hannestad, Steen^1 ; Hansen, Rasmus Sloth^1,3 ; Tram, Thomas^4

Department of Physics and Astronomy, Aarhus University, Aarhus C

8000, Denmark^1

Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, Aachen

D-52056, Germany^2

Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, Heidelberg

69117, Germany^3

Institute of Gravitation and Cosmology, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth

PO1 3FX, United Kingdom^4

关键词: Big bang nucleosynthesis;    Cosmic microwave backgrounds;    Early universe;    Eigenstates;    Large scale structures;    Neutrino interactions;    Neutrino oscillations;    Sterile neutrinos;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/3/032002/pdf
DOI  :  10.1088/1742-6596/718/3/032002

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Neutrino oscillation experiments point towards the existence of additional mostly sterile neutrino mass eigenstates in the eV mass range. At the same time, such sterile neutrinos are disfavoured by cosmology (Big Bang Nucleosynthesis, Cosmic Microwave Background and Large Scale Structure), unless they can be prevented from being thermalised in the early Universe. To this aim, we introduce a model of sterile neutrino secret interactions mediated by a new light pseudoscalar: The new interactions can accomodate sterile neutrinos in the early Universe, providing a good fit to all the up to date cosmological data.