Fingerprint of low-scale leptogenesis in the primordial gravitational-wave spectrum

被引：74

作者：

Blasi, Simone ^{[1
]}

Brdar, Vedran ^{[1
]}

Schmitz, Kai ^{[2
]}

机构：

[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[2] CERN, Theoret Phys Dept, CH-1211 Geneva 23, Switzerland

来源：

PHYSICAL REVIEW RESEARCH | 2020年 / 2卷 / 04期

关键词：

B-L; SYMMETRY; BARYOGENESIS; EVOLUTION; BREAKING; ORIGIN;

D O I：

10.1103/PhysRevResearch.2.043321

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dynamical generation of right-handed-neutrino (RHN) masses in the early Universe naturally entails the formation of cosmic strings that give rise to an observable signal in gravitational waves (GWs). In this paper, we show that a characteristic break in the GW spectrum would provide evidence for a nonstandard stage in the cosmological expansion history and a suppression of the RHN mass scale compared to the scale of spontaneous symmetry breaking. The detection of such a spectral feature would thus represent a unique possibility to probe the physics of RHN mass generation in regions of parameter space that allow for low-scale leptogenesis in accord with electroweak naturalness.

引用

页数：7

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