3 papers
astro-ph.CO2025
Primordial black hole formation from the merger of oscillons
Kentaro Kasai, Naoya Kitajima
We show that the merger of oscillons results in a broad spectrum of the oscillon mass. A huge number of oscillon samples obtained from numerical lattice simulations reveal that the…
gr-qc2025
Primordial black hole formation from collapsing domain walls with full general relativity
Naoya Kitajima
We study the dynamics of isolated closed domain walls with 3+1 numerical relativity. A closed wall shrinks due to its own surface tension, and its surface energy is converted to th…
hep-ph2025
Emission of Nambu-Goldstone bosons from the semilocal string network
Yukihiro Kanda, Naoya Kitajima
Semilocal cosmic string is a line-like non-topological soliton associated with the breakdown of the symmetry to the …