Filtered asymmetric dark matter during the Peccei-Quinn phase transition

A bstract In this paper, we propose a bubble filtering-out mechanism for an asymmetric dark matter scenario during the Peccei-Quinn (PQ) phase transition. Based on QCD axion model, extended by extra chiral neutrinos, show that PQ transition can be first order in parameter space of model and regarding symmetry breaking scale, generate PeV-scale heavy neutrinos as candidate. Considering CP-violating source, transition, discriminating between neutrino antineutrino number density, find observed relic abundance, such setup applied to with different strengths. We then calculate effective couplings addressing strong CP problem within model. also study energy density spectrum gravitational waves generated from signals detected future ground-based detectors Einstein Telescope. particular, visible case it is shown probed DECIGO BBO interferometers. Furthermore, discuss matter-standard annihilation process source creation neutrinos.