Dark matter, baryogenesis, 511 keV line: do they represent different faces of the same physics?

by Ariel Zhitnitsky (British Columbia University)

Thursday 25 Aug 2005, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

We present a new scenario where a few apparently very different problems such as Dark Matter and Baryogenesis may, in fact, have a common origin. This scenario is based on the idea that while the universe is globally symmetric, the antibaryon charge can be stored in chunks of dense colour-superconducting (CS) antimatter. In other words, the baryon asymmetry of the universe may not necessarily be expressed as a net baryon number if the anti-baryon charge is accumulated in the form of the diquark condensate in the CS phase, rather than in the form of free anti-baryons in the hadronic phase. We argue why such a scenario does not contradict the current observational data on antimatter in the Universe. We also argue that the observed cosmological ratio between the energy densities of dark and baryonic matter, Ω_DM ~ Ω _B within an order of magnitude, finds its natural explanation in this scenario: both contributions to Ω originated from the same physics at the same instant during the QCD phase transition. We also discuss the fact that the recent detection of 511 keV gamma-rays from the galactic bulge, as observed by INTEGRAL, can be naturally explained in this scenario.