2 papers
astro-ph.CO2025
Gravitational waves from metastable cosmic strings in the delayed scaling scenario
Yifan Hu, Kohei Kamada
Recent observations by pulsar timing arrays (PTAs) such as NANOGrav, EPTA, PPTA, and CPTA suggest the presence of nanohertz stochastic gravitational wave background (GWB). While su…
hep-th2025
Direct Expression for One-Loop Tensor Reduction with Lorentz Indices via Generating Function
Chang Hu, Yifan Hu, Jiyuan Shen
In recent work, we derived a direct expression for one-loop tensor reduction using generating functions and Feynman parametrization in projective space, avoiding recursive relation…