490 citations · 1.1k across the 19 of their papers we have counts for
21 papers
From Axion Detection to Dark Matter Astronomy
Jae Hyeok Chang, Stefano Profumo
A global haloscope network could turn an axion discovery into astronomy of dark matter substructure and transients. We combine interferometric phase, spatial coherence, and spectro…
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.…
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…
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 in the Shadows: Primordial Black Holes Making Dark Matter Shine
Kaustubh Agashe, Manuel Buen-Abad, Jae Hyeok Chang +4
We consider the possibility of indirect detection of dark sector processes by investigating a novel form of interaction between ambient dark matter (DM) and primordial black holes…
Axion Stars: Mass Functions and Constraints
Jae Hyeok Chang, Patrick J. Fox, Huangyu Xiao
The QCD axion and axion-like particles, as leading dark matter candidates, can also have interesting implications for dark matter substructures if the Peccei-Quinn symmetry is brok…
Dynamical Generation of the Baryon Asymmetry from a Scale Hierarchy
Jae Hyeok Chang, Kwang Sik Jeong, Chang Hyeon Lee +1
We propose a novel baryogenesis scenario where the baryon asymmetry originates directly from a hierarchy between two fundamental mass scales: the electroweak scale and the Plan…
Spectral distortions of astrophysical blackbodies as axion probes
Jae Hyeok Chang, Reza Ebadi, Xuheng Luo +1
Recent studies reveal that more than a dozen of white dwarfs displaying near-perfect blackbody spectra in the optical range have been lurking in the Sloan Digital Sky Survey catalo…
Gravitational-wave signatures from reheating
Manuel A. Buen-Abad, Jae Hyeok Chang, Anson Hook
We initiate a study of the gravitational-wave signatures of a phase transition that occurs as the Universe's temperature increases during reheating. The gravitational-wave signatur…
Confronting interacting dark radiation scenarios with cosmological data
Thejs Brinckmann, Jae Hyeok Chang, Peizhi Du +1
Dark radiation (DR) is generally predicted in new physics scenarios that address fundamental puzzles of the Standard Model or tensions in the cosmological data. Cosmological data h…
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…
Electroweak Asymmetric Early Universe via a Scalar Condensate
Jae Hyeok Chang, María Olalla Olea-Romacho, Erwin H. Tanin
Finite temperature effects in the Standard Model tend to restore the electroweak symmetry in the early universe, but new fields coupled to the higgs field may as well reverse this…
Dark Solar Wind
Jae Hyeok Chang, David E. Kaplan, Surjeet Rajendran +2
We study the solar emission of light dark sector particles that self-interact strongly enough to self-thermalize. The resulting outflow behaves like a fluid which accelerates under…
Correlating Gravitational Wave and Gamma-ray Signals from Primordial Black Holes
Kaustubh Agashe, Jae Hyeok Chang, Steven J. Clark +3
Asteroid-mass primordial black holes (PBH) can explain the observed dark matter abundance while being consistent with the current indirect detection constraints. These PBH can prod…
Self-interacting neutrinos, the Hubble parameter tension, and the Cosmic Microwave Background
Thejs Brinckmann, Jae Hyeok Chang, Marilena LoVerde
We perform a comprehensive study of cosmological constraints on non-standard neutrino self-interactions using cosmic microwave background (CMB) and baryon acoustic oscillation data…
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…
Structure Formation and Exotic Compact Objects in a Dissipative Dark Sector
Jae Hyeok Chang, Daniel Egana-Ugrinovic, Rouven Essig +1
We present the complete history of structure formation in a simple dissipative dark-sector model. The model has only two particles: a dark electron, which is a subdominant componen…
Supernova 1987A Constraints on Sub-GeV Dark Sectors, Millicharged Particles, the QCD Axion, and an Axion-like Particle
Jae Hyeok Chang, Rouven Essig, Samuel D. McDermott
We consider the constraints from Supernova 1987A on particles with small couplings to the Standard Model. We discuss a model with a fermion coupled to a dark photon, with various m…
US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report
Marco Battaglieri, Alberto Belloni, Aaron Chou +248
This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in Dark Matter" held at University of Maryland on March 23-25, 2017.
Revisiting Supernova 1987A Constraints on Dark Photons
Jae Hyeok Chang, Rouven Essig, Samuel D. McDermott
We revisit constraints on dark photons with masses below ~ 100 MeV from the observations of Supernova 1987A. If dark photons are produced in sufficient quantity, they reduce the am…