6 papers
SMBH Seeds from Dissipative Dark Matter
Huangyu Xiao, Xuejian Shen, Philip F. Hopkins +1
The existence of supermassive black holes (SMBHs) with masses greater than at high redshift () is difficult to accommodate in standard astrophysi…
Simulations of Axion Minihalos
Huangyu Xiao, Ian Williams, Matthew McQuinn
The axion, motivated as a solution to the strong CP problem, is also a viable dark matter candidate. We use N-body simulations to study the formation of substructures from white-no…
Early Structure Formation Constraints on the Ultra-Light Axion in the Post-Inflation Scenario
Vid Iršič, Huangyu Xiao, Matthew McQuinn
Many works have concentrated on the observable signatures of the dark matter being an ultralight axion-like particle (ALP). We concentrate on a particularly dramatic signature in t…
A Supersymmetric Theory of Baryogenesis and Sterile Sneutrino Dark Matter from Mesons
Gonzalo Alonso-Álvarez, Gilly Elor, Ann E. Nelson +1
Low-scale baryogenesis and dark matter generation can occur via the production of neutral mesons at MeV temperatures in the early Universe, which undergo CP-violating oscillati…
Baryogenesis from B Meson Oscillations
Ann E. Nelson, Huangyu Xiao
We show how CP violating B meson oscillations in conjunction with baryon number violating decays can generate the cosmological asymmetry between matter and anti-matter, and explore…
Axion Cosmology with Early Matter Domination
Ann E. Nelson, Huangyu Xiao
The default assumption of early universe cosmology is that the postinflationary universe was radiation dominated until it was about 47000 years old. Direct evidence for the radiati…