Author: sylvia

• research-publ

  Neutrinoless Double Beta Decay without Vacuum Majorana Neutrino Mass

  We present a proof-of-concept extension to the Standard Model that can generate a non-vanishing neutrinoless double beta decay ($0\nu\beta\beta$) signal without the existence of Majorana neutrinos or lepton number violation […]

• research-publ

  Dark population transfer mechanism for sterile neutrino dark matter

  We present a mechanism for producing a cosmologically-significant relic density of one or more sterile neutrinos. This scheme invokes two steps: First, a population of “heavy” sterile neutrinos is created […]

• research-publ

  Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses

  Black holes long-lived enough to be the dark matter have temperatures below the MeV. Since Hawking evaporation is a quasi-thermal process, no GeV emission is predicted to be produced by […]

• research-publ

  Constraints on primordial lepton asymmetries with full neutrino transport

  Primordial neutrino-antineutrino asymmetries can be constrained through big-bang nucleosynthesis (BBN) relic abundances and cosmic microwave background (CMB) anisotropies, both observables being sensitive to neutrino properties. The latter constraint, which is […]

• research-publ

  Neutrino Trapping and Out-of-Equilibrium Effects in Binary Neutron-Star Merger Remnants

  We study out-of-thermodynamic equilibrium effects in neutron star mergers with 3D general-relativistic neutrino-radiation large-eddy simulations. During merger, the cores of the neutron stars remain cold ($T \sim$ a few MeV) […]