83 citations · 390 across the 16 of their papers we have counts for
16 papers
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…
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…
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…
Cancellation of quantum corrections on the soft curvature perturbations
Yuichiro Tada, Takahiro Terada, Junsei Tokuda
We study the cancellation of quantum corrections on the superhorizon curvature perturbations from subhorizon physics beyond the single-clock inflation from the viewpoint of the cos…
New lower bounds on scattering amplitudes: non-locality constraints
Luca Buoninfante, Junsei Tokuda, Masahide Yamaguchi
Under reasonable working assumptions including the polynomial boundedness, one proves the well-known Cerulus-Martin lower bound on how fast an elastic scattering amplitude can decr…
Gravitational Positivity for Phenomenologists: Dark Gauge Boson in the Swampland
Katsuki Aoki, Toshifumi Noumi, Ryo Saito +4
The gravitational positivity bound gives quantitative "swampland'' constraints on low-energy effective theories inside theories of quantum gravity. We give a comprehensive discussi…