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gr-qc2026
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…
gr-qc2025
Collective Properties of Gravitational Perturbations in Thermal Environments on a Dynamical Background
Atsuhisa Ota
A thermal plasma dresses soft gauge fields, turning them into collective modes with a plasmon gap and Landau damping. In this paper, we ask whether a thermal radiation plasma does…