3 papers
gr-qc2026
Quantum Matter Makes Lightcones Quantum
Tomohiro Fujita, Misao Sasaki
In gravitational physics, matter does not merely move within spacetime; it also determines the light cones that define causal relations. What happens when the matter that determine…
hep-ph2023
Misalignment production of vector boson dark matter from axion-SU(2) inflation
Tomohiro Fujita, Kai Murai, Kazunori Nakayama +1
We present a new mechanism to generate a coherently oscillating dark vector field from axion-SU(2) gauge field dynamics during inflation. The SU(2) gauge field acquires a nonzero b…
astro-ph.CO2023
Parity-violating scalar trispectrum from a rolling axion during inflation
Tomohiro Fujita, Tomoaki Murata, Ippei Obata +1
We study a mechanism of generating the trispectrum (4-point correlation) of curvature perturbation through the dynamics of a spectator axion field and U(1) gauge field during infla…