17 citations · 23 across the 4 of their papers we have counts for
5 papers
How do late-time photons "record" primordial curvature perturbations?
Tomotaka Kuroda, Fumiya Sano, Yusuke Yamada
Inflationary cosmology faces a fundamental gap between primordial quantum fluctuations and the classical cosmic history inferred from observations. Although the primordial quantum…
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…
Holographic Entanglement Entropy in the FLRW Universe
Toshifumi Noumi, Fumiya Sano, Yu-ki Suzuki
We compute a holographic entanglement entropy via Ryu--Takayanagi prescription in the three-dimensional Friedmann--Lemaître--Robertson--Walker universe. We consider two types of ho…
Cosmological Correlators with Double Massive Exchanges: Bootstrap Equation and Phenomenology
Shuntaro Aoki, Lucas Pinol, Fumiya Sano +2
Using the recently developed cosmological bootstrap method, we compute the exact analytical solution for the seed integral appearing in cosmological correlators with double massive…
Analytic Formulae for Inflationary Correlators with Dynamical Mass
Shuntaro Aoki, Toshifumi Noumi, Fumiya Sano +1
Massive fields can imprint unique oscillatory features on primordial correlation functions or inflationary correlators, which is dubbed the cosmological collider signal. In this wo…