Showing gr-qcShow all
2 papers · 1 filter
gr-qc2026
Parity-violating Dark Photon Halos
Stephon Alexander, Lawrence Edmond, Cooper Niu
We propose a mechanism for the generation of gravitationally bound dark photon halos during the matter-dominated era. Coupled to an ultralight axion field through a parity-violatin…
gr-qc2024
Vacuum Amplification of Chiral Gravitational Waves and the Stochastic Gravitational Wave Background
Stephon Alexander, Heliudson Bernardo, Yiya Selina Li +1
We investigate cosmological vacuum amplification of gravitational waves in dynamical Chern-Simons gravity. We develop a comprehensive framework to compute graviton production induc…