6 papers
Probing New Degrees of Freedom with the Universal Tail of Primordial Black Hole Mass Functions
Kaustubh Agashe, Jae Hyeok Chang, Steven J. Clark +3
The primordial black hole (PBH) mass function today develops a low-mass evaporation tail whose shape is universal with respect to the initial PBH mass distribution. This universali…
Infrared Freeze-In of Magnetic Dipole Dark Matter
Asher Berlin, Jae Hyeok Chang, Tanner Trickle
We propose a novel mechanism for the cosmological production of keV - GeV mass dark matter that interacts with the Standard Model through a small effective magnetic dipole moment.…
Parametric Coincidence in the Baryon to Dark Matter Ratio from Affleck-Dine Baryogenesis and UV Freeze-in Dark Matter
Jae Hyeok Chang, Chang Sub Shin, James Unwin
We highlight that the observed concurrence between the baryon and dark matter relic densities can be explained via a parametric coincidence between two distinct production mechanis…
Light(ly)-coupled Dark Matter in the keV Range: Freeze-In and Constraints
Jae Hyeok Chang, Rouven Essig, Annika Reinert
Dark matter produced from thermal freeze-out is typically restricted to have masses above roughly 1 MeV. However, if the couplings are small, the freeze-in mechanism allows for pro…
Cosmological Constraints on Secluded Dark Radiation
Jae Hyeok Chang, Peizhi Du, Subhajit Ghosh +1
Dark radiation (DR) is ubiquitous in physics beyond the Standard Model (SM), and its interactions with the SM and dark matter (DM) lead to a variety of interesting effects on cosmo…
Detecting Axion-Like Particles with Primordial Black Holes
Kaustubh Agashe, Jae Hyeok Chang, Steven J. Clark +3
Future gamma-ray experiments, such as the e-ASTROGAM and AMEGO telescopes, can detect the Hawking radiation of photons from primordial black holes (PBHs) if they make up a fraction…