Universal Extra Dimension models with right-handed neutrinos
Shigeki Matsumoto, Joe Sato, Masato Senami, Masato Yamanaka
TL;DR
This paper explores how universal extra dimension models with right-handed neutrinos can account for dark matter relic abundance, potentially aligning with cosmological data at accessible energy scales.
Contribution
It introduces a UED model with right-handed neutrinos as dark matter candidates, addressing previous issues and expanding the viable parameter space.
Findings
KK right-handed neutrino can be dark matter
Relic abundance increases with larger neutrino masses
Extra dimension scale can be as low as 500 GeV
Abstract
Relic abundance of dark matter is investigated in the framework of universal extra dimension (UED) models with right-handed neutrinos. These models are free from the KK graviton problem in the minimal UED model. The first KK particle of the right-handed neutrino is a dark matter candidate in this framework. When ordinary neutrino masses are large enough such as the degenerate mass spectrum case, the dark matter relic abundance can increase significantly. The scale of the extra dimension consistent with cosmological observations can be 500 GeV in the minimal setup of UED models with right-handed neutrinos.
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