3 papers
gr-qc2026
Nonlinear Gravitational Wave Interactions in an Expanding Universe
Fan Zhang, Lee Lindblom, Zhi-Peng Peng
This study explores the nonlinear interactions between gravitational waves in an expanding universe. Random ensembles of gravitational waves are evolved numerically in cosmological…
astro-ph.IM2026
Efficient Evaluation of Gravitational Lensing Amplification Factors: A Deep Learning Framework
Fan Zhang, Qikai Zhang, Qiyuan Yang +2
Wave optics is essential for analyzing lensed gravitational waves (GWs), yet evaluating the diffraction integral is computationally expensive. We present a Sinusoidal Rep…
gr-qc2026
Solving Einstein's Equation Numerically on Manifolds with Non-Orientable Spatial Slices
Fan Zhang, Lee Lindblom
This paper presents solutions to Einstein's equation -- and the numerical methods used to construct them -- that describe simple cosmological models on manifolds with compact non-o…