Shining ALP dark radiation

被引：8
作者：
Jaeckel, Joerg [1 ]
Yin, Wen [2 ]
机构：
[1] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany
[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
来源：
PHYSICAL REVIEW D | 2022年 / 105卷 / 11期
关键词：
COSMIC-RAYS; GAMMA-RAYS; AXION; CONSTRAINTS; SCALE; UNIVERSE; MATTER; ANISOTROPY; PHYSICS; SEARCH;
D O I：
10.1103/PhysRevD.105.115003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
String scenarios typically not only predict axionlike particles (ALPs) but also significant amounts of ALP dark radiation originating from the decay of the inflaton or a more general modulus. In this paper, we study the decay of such nonthermally produced relativistic (but massive) ALPs to photons. If the ALPs are sufficiently highly energetic, contribute to Delta N-eff greater than or similar to O(0.001), and have a mass m(a) greater than or similar to MeV we find that, using observations of x-, and gamma-rays, the CMB and BBN, very small values of the ALP-photon coupling, can be probed, corresponding to an origin of this coupling at the string (or even Planck) scale.
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页数：13
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