21 cm limits on decaying dark matter and primordial black holes

doi:10.1103/PhysRevD.98.043006

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	21 cm limits on decaying dark matter and primordial black holes
	Dutta, B; Gao Y(高宇); Ma, YZ; Clark, SJ; Strigari, LE; Gao, Y
刊名	PHYSICAL REVIEW D
	2018
卷号	98 期号:4 页码:43006
ISSN号	2470-0010
DOI	10.1103/PhysRevD.98.043006
文献子类	Article
英文摘要	Recently the Experiment to Detect the Global Epoch of Reionization Signature reported the detection of a 21 cm absorption signal stronger than astrophysical expectations. In this paper we study the impact of radiation from dark matter (DM) decay and primordial black holes (PBHs) on the 21 cm radiation temperature in the reionization epoch, and impose a constraint on the decaying dark matter and PBH energy injection in the intergalactic medium, which can heat up neutral hydrogen gas and weaken the 21 cm absorption signal. We assume a strong coupling limit in the Lyman-alpha background and consider decay channels DM -> e(+)e(-), gamma gamma, mu(+)mu(-), tau(+)tau(-), b (b) over bar and the 10(15-17) g mass range for primordial black holes, and require that the heating of the neutral hydrogen does not negate the 21 cm absorption signal. For e(+)e(-), gamma gamma final states and PBH cases we find strong 21 cm bounds that can be more stringent than the current extragalactic diffuse photon bounds. For the DM -> e(+)e(-) channel, the lifetime bound is tau(DM) > 10(27) s for sub-GeV dark matter. The bound is tau(DM) = 10(26) s for the sub-GeV DM -> gamma gamma channel and reaches 10(27) s for MeV DM. For b (b) over bar and mu(+)mu(-) cases, the 21 cm constraint is better than all the existing constraints for m(DM) < 30 GeV where the bound on tau(DM) >= 10(26) s. For both DM decay and primordial black hole cases, the 21 cm bounds significantly improve over the cosmic microwave background damping limits from Planck data.
电子版国际标准刊号	2470-0029
WOS关键词	EARLY UNIVERSE ; RADIATION ; HYDROGEN ; RECOMBINATION ; ANNIHILATIONS ; REIONIZATION ; EMISSION ; SPECTRUM ; SIGNAL ; IMPACT
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000441110300001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286189]
专题	高能物理研究所_粒子天体物理中心高能物理研究所_加速器中心
通讯作者	Gao Y(高宇)
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Dutta, B,Gao Y,Ma, YZ,et al. 21 cm limits on decaying dark matter and primordial black holes[J]. PHYSICAL REVIEW D,2018,98(4):43006.
APA	Dutta, B,高宇,Ma, YZ,Clark, SJ,Strigari, LE,&Gao, Y.(2018).21 cm limits on decaying dark matter and primordial black holes.PHYSICAL REVIEW D,98(4),43006.
MLA	Dutta, B,et al."21 cm limits on decaying dark matter and primordial black holes".PHYSICAL REVIEW D 98.4(2018):43006.