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hep-th2025
False and genuine decoherence in the early universe: a local observer and time-averaged observables
Fumiya Sano, Junsei Tokuda
We study quantum decoherence of curvature perturbations at superhorizon scales caused by the gravitational nonlinearities. We show that cubic gravitational couplings, constrained b…
hep-th2024
String loops and gravitational positivity bounds: imprint of light particles at high energies
Simon Caron-Huot, Junsei Tokuda
We study loop corrections to positivity bounds on effective field theories in the context of scattering in gravitational theories, in the presence of light particles. It h…
hep-th2024
Stochastic tunneling in de Sitter spacetime
Taiga Miyachi, Jiro Soda, Junsei Tokuda
Tunneling processes in de Sitter spacetime are studied by using the stochastic approach. We exploit the Martin-Siggia-Rose-Janssen-de Dominicis (MSRJD) functional integral to obtai…