COLD DARK MATTER GENERATION BY AXIONIC DOMAIN WALL COLLAPSES

摘要

The contribution to the cold dark matter density by axionic domain wall collapses is estimated. The dynamics of the axionic domain wall bounded by the axionic string is investigated using numerical simulations. It is found that the collapse proceeds quickly and mildly relativistic axions are emitted. Their energy density increases during radiation dominated era and can account for the dark matter in the universe for F-alpha > 10(10) GeV. [References: 24]