9 papers
CMB Spectral Distortion Anisotropies from Acoustic Damping with primordial non-Gaussianity
Jens Chluba, Atsuhisa Ota, Nicola Bartolo
In this paper, we evaluate the precise distortion source and transfer functions caused by mixing of blackbodies of different temperatures using the recently developed frequency hie…
The Challenge of Detecting Quantum Nature of Gravitational Waves
Yu Miyauchi, Hidetoshi Omiya, Atsuhisa Ota +2
We investigate whether squeezing can provide an observable signature of quantum gravitational waves. Because a realistic detector couples only to a particular wave-packet mode, squ…
Ultraviolet Structure of Real-time Gravitational Wave Linear Response in a Resonant Scalar Field
Han Lai, Atsuhisa Ota
We study the real-time linear response of gravitational waves in a time-dependent resonant scalar field in a Minkowski background. In the Schwinger-Keldysh formalism, we develop an…
Real-time Gravitational Wave Response in Thermal Spinning fields
Atsuhisa Ota, Hui-Yu Zhu, Yuhang Zhu
We study how the spin content of the thermal plasmas affects the propagation of gravitational waves in a radiation-dominated universe. As a simple but representative setup, we cons…
Symmetry principles of gravitational perturbations in thermal environments
Atsuhisa Ota
The thermal plasma induces a plasmon-like mass shift for gravitational perturbations, which can modify their dynamics near the horizon scale in the early radiation-dominated univer…
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…