2 citations · 4 across the 3 of their papers we have counts for
3 papers
gr-qc2019★ 1 cited
Non-Fierz-Pauli bimetric theory from quadratic curvature gravity on Einstein manifolds
Yuki Niiyama, Yuya Nakamura, Ryosuke Zaimokuya +2
We show that, in four-dimensional spacetimes with an arbitrary Einstein metric, with and without a cosmological constant, perturbative dynamical degrees of freedom in generic quadr…
gr-qc2019★ 1 cited
A quantisation procedure in the presence of an initial Kasner singularity: primordial gravitational waves from triaxially anisotropic pre-inflation
Yu Furuya, Yuki Niiyama, Yuuiti Sendouda
In this paper, we discuss quantisation of cosmological tensor perturbations in the Kasner-de Sitter space-time as a model of (pre-)inflation. Quantisation in such an anisotropic ba…
astro-ph.CO2016★ 2 cited
Probing pre-inflationary anisotropy with directional variations in the gravitational wave background
Yu Furuya, Yuki Niiyama, Yuuiti Sendouda
We perform a detailed analysis on a primordial gravitational-wave background amplified during a Kasner-like pre-inflationary phase allowing for general triaxial anisotropies. It is…