Abstract
We propose a new mechanism to understand the relation between baryon and dark matter asymmetries in the universe in theories where the baryon number is a local symmetry. In these scenarios the B−L asymmetry generated through a mechanism such as leptogenesis is transferred to the dark matter and baryonic sectors through sphalerons processes which conserve total baryon number. We show that it is possible to have a consistent relation between the dark matter relic density and the baryon asymmetry in the universe even if the baryon number is broken at the low scale through the Higgs mechanism. We also discuss the case where one uses the Stueckelberg mechanism to understand the conservation of baryon number in nature.
Highlights
The existence of the baryon asymmetry and cold dark matter density in the Universe has motivated many studies in cosmology and particle physics
We find a consistent connection between baryon asymmetry and dark matter relic density
If we study the case in scenario 2, where SB carries charge B = ±3, we find the same relationship between baryon asymmetry and dark matter density as in the Stueckelberg case
Summary
The existence of the baryon asymmetry and cold dark matter density in the Universe has motivated many studies in cosmology and particle physics. In theories where the baryon number is a local symmetry and spontaneously broken at low scale one could have a mechanism which explains the relation of the baryon asymmetry and dark matter. In this model baryon number is a local gauge symmetry which is spontaneously broken at the low scale. One can generate masses for all new fields through the Higgs mechanism consistent with collider bounds This simple theory provides a fermionic dark matter candidate for which stability is a natural consequence of the spontaneous breaking of baryon number at the low scale. This article is organized as follows: In section II we define the theory where baryon number is a local gauge symmetry, and we discuss the different mechanisms for generating the leptophobic gauge boson mass.
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