3 papers
astro-ph.CO2026
Investigating cosmic strings using large-volume hydrodynamical simulations in the context of JWST's massive UV-bright galaxies
Sonja M. Koehler, Hao Jiao, Rahul Kannan
Recent observations from the James Webb Space Telescope (JWST) have uncovered an unexpectedly large abundance of massive, UV-bright galaxies at high redshifts, presenting a signifi…
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…
hep-ph2025
Cosmological Magnetic Fields from Ultralight Dark Matter
Robert Brandenberger, Jürg Fröhlich, Hao Jiao
We propose a mechanism for the generation of magnetic fields on cosmological scales that is operative after recombination. An essential ingredient is an instability (of parametric…