detalle del documento
IDENTIFICACIÓN
oai:arXiv.org:2410.00096
Tema
High Energy Physics - Phenomenolog... Astrophysics - Cosmology and Nonga...Autor
Borah, Debasish Das, Nayan Saha, IndrajitCategoría
ciencias: astrofísica
Año
2024
fecha de cotización
2/10/2024
Palabras clave
asymmetry dmResumen
Dark matter (DM), in spite of being stable or long-lived on cosmological scales, can decay in the early Universe due to finite-temperature effects.
In particular, a first order phase transition (FOPT) in the early Universe can provide a finite window for such decay, guaranteeing DM stability at lower temperatures, consistent with observations.
The FOPT can lead to the generation of stochastic gravitational waves (GW) with peak frequencies correlated with DM mass.
On the other hand, early DM decay into neutrinos can create a large neutrino asymmetry which can have interesting cosmological consequences in terms of enhanced effective relativistic degrees of freedom $N_{\rm eff}$, providing a solution to the recently observed Helium anomaly among others.
Allowing DM decay to occur below sphaleron decoupling temperature, thereby avoiding overproduction of baryon asymmetry, forces the FOPT to occur at sub-electroweak scale.
This leaves the stochastic GW within range of experiments like LISA, $\mu$ARES, NANOGrav etc. ;Comment: 30 pages, 6 captioned figures
Borah, Debasish,Das, Nayan,Saha, Indrajit, 2024, Large neutrino asymmetry from forbidden decay of dark matter
Utility of Photon-Counting Detector CT Myelography for the Detection of CSF-Venous Fistulas
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