Dark Atoms and their decaying constituents

Understand

The nonbaryonic dark matter of the Universe might consist of new stable charged species, bound by ordinary Coulomb interactions in various forms of heavy neutral "dark atoms".

• The existing models offer natural implementations for the dominant and subdominant forms of dark atom components.
• In the framework of Walking Technicolor the charge asymmetric excess of both stable negatively doubly charged technilepton $\zeta^{--}$ and metastable but longliving positively doubly charged technibaryon $UU^{++}$ can be generated in the early Universe together with the observed baryon asymmetry.
• If the excess of $\zeta$ exceeds by several orders of magnitude the excess of $UU$, dark matter might consist dominantly by $He\zeta$ dark atoms of nuclear interacting O-helium ($OHe$) bound state of $\zeta$ with primordial helium.