Roads for right-handed neutrino dark matter: Fast expansion, standard freeze-out, and early matter domination

被引：12

作者：

Arcadi, Giorgio ^{[1
,2
,3
]}

Paulo Neto, Jacinto ^{[4
,5
]}

Queiroz, Farinaldo S. ^{[4
,5
,6
]}

Siqueira, Clarissa ^{[7
]}

机构：

[1] Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00146 Rome, Italy

[2] Ist Nazl Fis Nucl, Sez Roma Tre, Via Vasca Navale 84, I-00146 Rome, Italy

[3] Univ Messina, Dipartimento Sci Matemat & Informat Sci Fis & Sci, Via Ferdinando Stagno dAlcontres 31, I-98166 Messina, Italy

[4] Univ Fed Rio Grande do Norte, Dept Fis, BR-59078970 Natal, RN, Brazil

[5] Univ Fed Rio Grande do Norte, Int Inst Phys, Campus Univ, BR-59078970 Natal, RN, Brazil

[6] Millennium Inst Subat Phys High Energy Frontier S, Fernandez Concha 700, Santiago 7550196, Chile

[7] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP, Brazil

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

HIGGS DOUBLET MODEL; STERILE NEUTRINOS; CONSTRAINTS; PHYSICS;

D O I：

10.1103/PhysRevD.105.035016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Right-handed neutrinos appear in several extensions beyond the Standard Model, especially in connection to neutrino masses. Motivated by this, we present a model of right-handed neutrino dark matter that interacts with Standard Model particles through a new gauge symmetry as well as via mass mixing between the new vector field and the Z boson, and investigate different production mechanisms. We derive the dark matter relic density when the Hubble rate is faster than usual, when dark matter decouples in a matter domination epoch, and when it decouples in a radiation domination regime, which is then followed by a matter domination era. The direct detection rate features a spin-independent but velocity suppressed operator, as well as a spindependent operator when the mass mixing is correctly accounted for. We put all these results into perspective with existing flavor physics, atomic parity violation, and collider bounds. Lastly, we outline the region of parameter space in which weak-scale right-handed neutrino dark matter stands as a viable dark matter candidate.

引用

页数：18

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