Speaker
Description
Asymmetric dark matter (ADM) explains the present DM abundance by asymmetry between DM particles and anti-particles, like visible matter or standard model (SM) baryons.
It is particularly interesting when the visible and dark asymmetries have a common origin, since their abundances are different only by a factor of ~5.
In such a case, DM mass should be 1-10 GeV.
ADM is naturally realized by a dark sector strong dynamics like SM QCD, where a composite particle, dark baryon, is DM.
In this talk, we first illustrate how a composite ADM scenario works, by stressing roles of high-energy and low-energy portals.
The high-energy portal, which equilibrates asymmetries in the early Universe, may lead to a smoking-gun signature such as ~1 GeV monochromatic antineutrino flux from ADM decay.
At the same time, the low-energy portal, which releases an entropy from dark sector to SM sector, may lead to ~1 GeV electrons, positrons and gamma rays from the same ADM decay.
In the second part of the talk, we discuss multi-messenger constraints of ADM decay signals.
