5 papers
Baryogenesis via the CKM Matrix with Minimal Flavor Violation
Innes Bigaran, Gordan Krnjaic, Kevin Langhoff +1
It is often claimed Standard Model CP violation is insufficient for baryogenesis. We present a counterexample using minimal flavor violation (MFV) in which all CP-violating effects…
Primordial Neutron Stars
Gordan Krnjaic, Duncan Rocha, Huangyu Xiao
We propose a novel cosmological scenario in which baryonic neutron stars could plausibly form in the early universe. If baryogenesis initially produces an excessively-large baryon…
Supermassive Primordial Black Holes from a Catalyzed Dark Phase Transition for Little Red Dots
Jinhui Guo, Jia Liu, Masanori Tanaka +2
JWST has revealed an abundant population of compact, low-metallicity "Little Red Dots" (LRDs) at high redshift, challenging conventional scenarios in which supermassive black holes…
Clustering and Runaway Merging in a Primordial Black Hole Dominated Universe
Ian Holst, Gordan Krnjaic, Huangyu Xiao
If primordial black holes (PBH) are present in the early universe, their contribution to the energy budget grows relative to that of radiation and generically becomes dominant unle…
Massive Black Holes Seeded by Dark Matter -- Implications for Little Red Dots and Gravitational Wave Signatures
Tingwei Shen, Xuejian Shen, Huangyu Xiao +2
Observations of supermassive black holes (SMBHs) at high redshifts challenge standard seeding scenarios. We examine a dissipative self-interacting dark matter (dSIDM) model in whic…