Precision constraints on radiative neutrino decay with CMB spectral distortion

被引：23

作者：

Aalberts, Jelle L. ^{[1
]}

Ando, Shin'ichiro ^{[1
,2
,3
]}

Borg, Wouter M. ^{[1
]}

Broeils, Edwin ^{[1
]}

Broeils, Jennypher ^{[1
]}

Broeils, Stephen ^{[1
]}

Kavanagh, Bradley J. ^{[1
,2
]}

Leguijt, Gijs ^{[1
]}

Reemst, Marnix ^{[1
]}

van Arneman, Dylan R. ^{[1
]}

Hoang Vu ^{[1
]}

机构：

[1] Univ Amsterdam, Inst Theoret Phys, NL-1098 XH Amsterdam, Netherlands

[2] Univ Amsterdam, GRAPPA Inst, NL-1098 XH Amsterdam, Netherlands

[3] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe Kavli IPMU, WPI, Kashiwa, Chiba 2778583, Japan

来源：

PHYSICAL REVIEW D | 2018年 / 98卷 / 02期

关键词：

GAUGE-THEORIES; MAGNETIC-MOMENTS; ELECTROMAGNETIC PROPERTIES; MAJORANA NEUTRINOS; WEAK-INTERACTIONS; THERMALIZATION; FLUCTUATIONS; PROSPECTS; SYMMETRY; LEPTON;

D O I：

10.1103/PhysRevD.98.023001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the radiative decay of the cosmic neutrino background and its impact on the spectrum of the cosmic microwave background (CMB) that is known to be a nearly perfect black body. We derive exact formulas for the decay of a heavier neutrino into a lighter neutrino and a photon, nu(j) -> nu(i) +gamma , and of absorption as its inverse, nu(i) + gamma -> nu(j), by accounting for the precise form of the neutrino momentum distribution. Our calculations show that if the neutrinos are heavier than O(0.1) eV the exact formulas give results that differ by similar to 50%, compared with approximate ones where neutrinos are assumed to be at rest. We also find that spectral distortion due to absorption is more important for heavy neutrino masses (by a factor of similar to 10 going from a neutrino mass of 0.01-0.1 eV). By analyzing the CMB spectral data measured with COBE-FIRAS, we obtain lower limits on the neutrino lifetime of tau(12) greater than or similar to 4 x 10(21) s (95% C.L.) for the smaller mass splitting and tau(13) similar to tau(23) greater than or similar to 10(19) s for the larger mass splitting. These represent up to 1 order of magnitude improvement over previous CMB constraints. With future CMB experiments such as PIXIE, these limits will improve by roughly 4 orders of magnitude. This translates to a projected upper limit on the neutrino magnetic moment (for certain neutrino masses and decay modes) of mu(nu) < 3 x 10(-11) mu(B), where mu(B) is the Bohr magneton. Such constraints would make future precision CMB measurements competitive with lab-based constraints on neutrino magnetic moments.

引用

页数：14

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