Signatures of dark radiation In neutrino and dark matter detectors

被引：44

作者：

Cui, Yanou ^{[1
]}

Pospelov, Maxim ^{[2
,3
,4
]}

Pradler, Josef ^{[5
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[2] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2W9, Canada

[3] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada

[4] CERN, Theoret Phys Dept, CH-1211 Geneva, Switzerland

[5] Austrian Acad Sci, Inst High Energy Phys, Nikolsdorfergasse 18, A-1050 Vienna, Austria

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 10期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CONSTRAINTS; MAJORON; PHYSICS;

D O I：

10.1103/PhysRevD.97.103004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the generic possibility that the Universe's energy budget includes some form of relativistic or semi-relativistic dark radiation (DR) with nongravitational interactions with standard model (SM) particles. Such dark radiation may consist of SM singlets or a nonthermal, energetic component of neutrinos. If such DR is created at a relatively recent epoch, it can carry sufficient energy to leave a detectable imprint in experiments designed to search for very weakly interacting particles: dark matter and underground neutrino experiments. We analyze this possibility in some generality, assuming that the interactive dark radiation is sourced by late decays of an unstable particle, potentially a component of dark matter, and considering a variety of possible interactions between the dark radiation and SM particles. Concentrating on the sub-GeV energy region, we derive constraints on different forms of DR using the results of the most sensitive neutrino and dark matter direct detection experiments. In particular, for interacting dark radiation carrying a typical momentum of similar to 30 MeV/c, both types of experiments provide competitive constraints. This study also demonstrates that non-standard sources of neutrino emission (e.g., via dark matter decay) are capable of creating a "neutrino floor" for dark matter direct detection that is closer to current bounds than is expected from standard neutrino sources.

引用

页数：15

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