3 papers
gr-qc2026
Gauge-independent approach to inflation in quadratic gravity
Adrian Palomares, Ying-li Zhang, Jinsu Kim
We investigate the scalar sector of linear cosmological perturbations in quadratic gravity. Working in the Einstein frame, we derive the equations of motion in a gauge-independent…
astro-ph.CO2025
Gravitational wave signatures of preheating in Higgs-- inflation
Jinsu Kim, Zihao Yang, Ying-li Zhang
We present a comprehensive analysis of the preheating dynamics and associated gravitational wave signatures in the Higgs-- inflationary model. Using lattice simulations, we in…
astro-ph.CO2025
Enhancement of primordial curvature perturbations in -corrected Starobinsky-Higgs inflation
Jinsu Kim, Xinpeng Wang, Ying-li Zhang +1
We provide a systematic study of the Starobinsky-Higgs inflation model in the presence of an additional cubic term of the Ricci scalar. We investigate, in particular, the effects o…