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astro-ph.CO2024
Cosmological stimulated emission
Atsuhisa Ota
We study stimulated emission and absorption of gravitons in a squeezed vacuum state immersed in a thermal radiation bath. Employing one-loop interaction-picture perturbation theory…
hep-th2024
Mode analysis of Nambu-Goldstone modes in U(1) charged first-order relativistic viscous hydrodynamics
Atsuhisa Ota
We conduct a mode analysis of a general -charged first-order relativistic hydrodynamics within the framework of effective field theory for dissipative fluids in flat Minkowsk…
hep-th2024
Fluctuation-dissipation relation in cosmic microwave background
Atsuhisa Ota
We study the fluctuation-dissipation relation for sound waves in the cosmic microwave background (CMB), employing effective field theory (EFT) for fluctuating hydrodynamics. Treati…