9 papers
Low-Energy Signals from the Formation of Dark Matter-Nuclear Bound States
Asher Berlin, Hongwan Liu, Maxim Pospelov +1
Dark matter particles may bind with nuclei if there exists an attractive force of sufficient strength. We show that a dark photon mediator of mass MeV that kineti…
Machine Learning the 6th Dimension: Stellar Radial Velocities from 5D Phase-Space Correlations
Adriana Dropulic, Bryan Ostdiek, Laura J. Chang +3
The Gaia satellite will observe the positions and velocities of over a billion Milky Way stars. In the early data releases, the majority of observed stars do not have complete 6D p…
Modeling Dark Photon Oscillations in Our Inhomogeneous Universe
Andrea Caputo, Hongwan Liu, Siddharth Mishra-Sharma +1
A dark photon may kinetically mix with the Standard Model photon, leading to observable cosmological signatures. The mixing is resonantly enhanced when the dark photon mass matches…
Dark Photon Oscillations in Our Inhomogeneous Universe
Andrea Caputo, Hongwan Liu, Siddharth Mishra-Sharma +1
A dark photon may kinetically mix with the ordinary photon, inducing oscillations with observable imprints on cosmology. Oscillations are resonantly enhanced if the dark photon mas…
Reviving Millicharged Dark Matter for 21-cm Cosmology
Hongwan Liu, Nadav Joseph Outmezguine, Diego Redigolo +1
The existence of millicharged dark matter (mDM) can leave a measurable imprint on 21-cm cosmology through mDM-baryon scattering. However, the minimal scenario is severely constrain…
Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
Hongwan Liu
The discovery of nongravitational interactions between dark matter and the Standard Model would be an important step in unraveling the nature of dark matter. If such an interaction…