19 citations · 25 across the 8 of their papers we have counts for
9 papers
QCD Crossover Transfer Functions for Scalar-Induced Gravitational Waves in the PTA Band
Gabriele Franciolini, Xavier Pritchard, Yuichiro Tada
Pulsar timing array (PTA) collaborations have reported evidence for a stochastic gravitational wave (GW) background in the nHz band. Should scalar-induced GWs, sourced at second or…
Constant-Roll Inflation: Analytical Formulae for Power Spectrum and Implications for Induced Gravitational Waves
Hayato Motohashi, Shi Pi, Yuichiro Tada +1
Constant-roll inflation provides a simple and analytically tractable framework for describing transient departures from slow roll, including non-attractor phases that can enhance t…
Domain-wall Quintessence
Nobufusa Kobayashi, Yuichiro Tada, Fuminobu Takahashi +1
We investigate a dark energy model driven by a planar domain-wall-like structure with a thickness comparable to, or larger than, the current Hubble radius, focusing on its intrinsi…
Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the formalism
Pankaj Saha, Yuichiro Tada, Yuko Urakawa
Understanding when inflationary perturbations become genuinely nonlinear near the horizon crossing requires methods that go beyond both linear perturbation theory and the gradient…
STOchastic LAttice Simulation of hybrid inflation
Tomoaki Murata, Yuichiro Tada
We investigate the spatial profile of the curvature perturbation generated in multi-waterfall hybrid inflation models, which are known to produce various topological defects. Using…
Stochastic-tail of the curvature perturbation in hybrid inflation
Tomoaki Murata, Yuichiro Tada
The exponential-tail behaviours of the probability density function (PDF) of the primordial curvature perturbation are confirmed in the mild-waterfall variants of hybrid inflation…
Dip and non-linearity in the curvature perturbation from inflation with a transient non-slow-roll stage
Tomohiro Fujita, Ryodai Kawaguchi, Misao Sasaki +1
We consider models of inflation that contain a transient non-slow-roll stage and investigate the conditions under which a dip appears in the power spectrum of the curvature perturb…
Towards a classification of UV completable Higgs inflation in metric-affine gravity
Yusuke Mikura, Yuichiro Tada
Towards a classification of UV completable Higgs inflation in the framework of parity-even metric-affine gravity, we investigate the particle spectrum of a deformed theory in the l…
STOLAS: STOchastic LAttice Simulation of cosmic inflation
Yurino Mizuguchi, Tomoaki Murata, Yuichiro Tada
We develop a C++ package of the STOchastic LAttice Simulation (STOLAS) of cosmic inflation. It performs the numerical lattice simulation in the application of the stochastic- f…