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astro-ph.CO2026
Reheating with Axion-SU(2) and Gravitational Chern-Simons Couplings
Tatsuya Daniel, Vahid Kamali
We study the early stages of an oscillatory reheating phase in an inflaton plus spectator axion-SU(2) system, including both an axion-gauge Chern-Simons coupling and…
astro-ph.CO2025
Direct Collapse Supermassive Black Holes from Ultralight Dark Matter
Hao Jiao, Robert Brandenberger, Vahid Kamali
We study the possibility that parametric resonant excitation of photons in an ultralight dark matter halo could generate the required flux of Lyman-Werner photons to allow the dire…