3 papers
gr-qc2026
Naturally Light Distortion
Kazunori Nakayama
In the most general formulation of gravity, the metric and connection are independent degrees of freedom, and the connection may include torsion and non-metricity (or distortion, c…
hep-ph2025
PQ-ball and its Real Scalar Analogue in an Expanding Universe
Kazunori Nakayama, Masaki Yamada
We demonstrate the formation of quasi-stable localized scalar configurations in spontaneously symmetry breaking U(1) model by 3+1-dimensional classical lattice simulations. Such co…
hep-ph2025
Decay rate of PQ-ball
Jin Kobayashi, Kazunori Nakayama, Masaki Yamada
Q-balls are non-topological solitons that arise in theories with a complex scalar field possessing a conserved global U(1) charge. Their stability is ensured by this charge, making…