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astro-ph.CO2026
Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations
Peng-Yu Wu, Di Wu, Jing-Zhi Zhou
Large primordial curvature and tensor perturbations on small scales can generate second-order tensor-scalar induced gravitational waves (TSIGWs) through scalar-scalar, tensor-scala…
astro-ph.CO2026
Inflation on the lattice: scalar Gauss-Bonnet single field inflation
Fei-Yu Chen, Jing-Zhi Zhou, Zhi-Chao Li +1
We use lattice methods to study inflation in the scalar Gauss-Bonnet (SGB) gravity theory. We focus on the ultra-slow-roll scenario with the peak frequency falls into the PTA band.…