305 citations · 2.9k across the 49 of their papers we have counts for
4 papers · 1 filter
Improved estimation of radiated axions from cosmological axionic strings
Takashi Hiramatsu, Masahiro Kawasaki, Toyokazu Sekiguchi +2
Cosmological evolution of axionic string network is analyzed in terms of field-theoretic simulations in a box of 512^3 grids, which are the largest ever, using a new and more effic…
Evolution of String-Wall Networks and Axionic Domain Wall Problem
Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa
We study the cosmological evolution of domain walls bounded by strings which arise naturally in axion models. If we introduce a bias in the potential, walls become metastable and f…
Numerical study of Q-ball formation in gravity mediation
Takashi Hiramatsu, Masahiro Kawasaki, Fuminobu Takahashi
We study Q-ball formation in the expanding universe on 1D, 2D and 3D lattice simulations. We obtain detailed Q-ball charge distributions, and find that the distribution is peaked a…
Gravitational Waves from Collapsing Domain Walls
Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa
We study the production of gravitational waves from cosmic domain walls created during phase transition in the early universe. We investigate the process of formation and evolution…