Interacting neutrinos in cosmology: exact description and constraints

被引：97

作者：

Oldengott, Isabel M. ^{[1
]}

Tram, Thomas ^{[2
,3
]}

Rampf, Cornelius ^{[4
,5
]}

Wong, Yvonne Y. Y. ^{[6
]}

机构：

[1] Bielefeld Univ, Fak Phys, D-33501 Bielefeld, Germany

[2] Univ Aarhus, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[3] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[4] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany

[5] Israel Inst Technol Technion, Dept Phys, IL-32000 Haifa, Israel

[6] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2017年 / 11期

基金：

澳大利亚研究理事会;

关键词：

cosmological neutrinos; cosmological parameters from CMBR; cosmology of theories beyond the SM; cosmological perturbation theory; BARYON ACOUSTIC-OSCILLATIONS; GALAXIES; MODEL;

D O I：

10.1088/1475-7516/2017/11/027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the impact of neutrino self-interactions described by an effective four-fermion coupling on cosmological observations. Implementing the exact Boltzmann hierarchy for interacting neutrinos first derived in [1] into the Boltzmann solver CLASS, we perform a detailed numerical analysis of the effects of the interaction on the cosmic microwave background (CMB) anisotropies, and compare our results with known approximations in the literature. While we find good agreement between our exact approach and the relaxation time approximation used in some recent studies, the popular (c(eff)(2), c(vis)(2))-parameterisation fails to reproduce the correct scale dependence of the CMB temperature power spectrum. We then proceed to derive constraints on the effective coupling constant G(eff) using currently available cosmological data via an MCMC analysis. Interestingly, our results reveal a bimodal posterior distribution, where one mode represents the standard Lambda CDM limit with G(eff) less than or similar to 10(8) G(F), and the other a scenario in which neutrinos self-interact with an effective coupling constant G(eff) similar or equal to 3 x 10(9) G(F).

引用

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