339 citations · 2.8k across the 32 of their papers we have counts for
4 papers · 1 filter
Evolution and thermalization of dark matter axions in the condensed regime
Ken'ichi Saikawa, Masahide Yamaguchi
We discuss the possibility that dark matter axions form a Bose-Einstein condensate (BEC) due to the gravitational self-interactions. The formation of BEC occurs in the condensed re…
Gravitational waves from smooth hybrid new infation
Masahiro Kawasaki, Ken'ichi Saikawa, Naoyuki Takeda
We calculate the production of the gravitational waves from a double inflation model with lattice simulations. Between the two inflationary stages, gravitational waves with a chara…
Axion cosmology with long-lived domain walls
Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa +1
We investigate the cosmological constraints on axion models where the domain wall number is greater than one. In these models, multiple domain walls attached to strings are formed,…
Production of dark matter axions from collapse of string-wall systems
Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa +1
We analyze the spectrum of axions radiated from collapse of domain walls, which have received less attention in the literature. The evolution of topological defects related to the…