Wash-in leptogenesis is a powerful mechanism to generate the baryon asymmetry of the
Universe that treats right-handed-neutrino interactions on the same footing as electroweak …

We investigate the first-order phase transition catalyzed by primordial black holes (PBHs) in
the early Universe. We find that superhorizon curvature perturbations generated in this …

We explore the cosmological and astrophysical implications of a realistic hybrid inflation
model based on flipped SU (5). The model contains superheavy metastable cosmic strings …

When light primordial black holes (PBHs) evaporate in the early Universe, they locally
reheat the surrounding plasma, creating hot spots with temperatures that can be significantly …

We quantitatively analyze a basic question: what is the stationary solution of the background
plasma temperature profile around a black hole (BH)? One may naively expect that the …

Higher derivative terms in the gravitational action are natural from the perspective of
quantum gravity, but are perceived as leading to a lack of well-posedness. The Gauss …