247 citations · 2k across the 37 of their papers we have counts for
4 papers · 1 filter
Measurement of Parity Violation in the Early Universe using Gravitational-wave Detectors
S. G. Crowder, R. Namba, V. Mandic +2
A stochastic gravitational-wave background (SGWB) is expected to arise from the superposition of many independent and unresolved gravitational-wave signals, of either cosmological…
Curvature Perturbations from a Massive Vector Curvaton
Ryo Namba
We study a ghost-free model of massive vector curvaton proposed in the literature, where the quick decrease of the vector background expectation value is avoided by a suitable choi…
Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton
Neil Barnaby, Jordan Moxon, Ryo Namba +3
We study the possibility that particle production during inflation could source observable gravity waves on scales relevant for Cosmic Microwave Background experiments. A crucial c…
Observable non-gaussianity from gauge field production in slow roll inflation, and a challenging connection with magnetogenesis
Neil Barnaby, Ryo Namba, Marco Peloso
In any realistic particle physics model of inflation, the inflaton can be expected to couple to other fields. We consider a model with a dilaton-like coupling between a U(1) gauge…