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Information Center for Mathematical Science

세미나

Information Center for Mathematical Science

세미나

서울대학교 물리천문학부 세미나
Title Smallest halos in thermal wino dark matter
Date 2019-02-08
Speaker Ayuki Kamada(IBS-CTPU)
Sponsors 2019-02-08
Host SNU
Place 56-521
Abstract split supersymmetry explains the observed Higgs mass and evades stringent constraints, while keeps good features of TeV-scale supersymmetry other than the little hierarchy problem. Such scenarios naturally predict thermal wino dark matter whose mass is around 3 TeV. Its non-perturbativ​ely enhanced annihilation is a promising target of indirect detection experiments. It is known that identifying the smallest halos is essential for reducing an uncertainty in interpreting indirect detection experiments. Despite its importance, the smallest halos of thermal wino dark matter have not been well understood. In this talk, we remark two aspects: 1) neutral wino is in kinetic equilibrium with primordial plasma predominantly through inelastic processes involving slightly heavier charged wino; and 2) the resultant density contrast shows larger powers at dark acoustic oscillation peaks than in cold dark matter, which is known as an overshooting phenomenon. The latter can enhance a total luminosity of dark matter annihilation in a halo significantly.