II WORKSHOP :NOVA FÍSICA NO ESPAÇO

VOLTAR INTRODUÇÃO

Herman J. Mosquera Cuesta

BACK-REACTION OF GRAVITATIONAL WAVES AS
THE ORIGIN OF NATAL PULSARS KICKS

Herman J. Mosquera Cuesta (CBPF)

At the early core-bounce of a supernova collapse rapid convective overturn along with gradients in density and temperature in the neutrino-decoupling zone drives anisotropic neutrino flux. If then active-to-sterile () neutrino oscillations in the dense core take place, gravitational radiation should be emitted all the way the oscillation length. Since the oscillation feeds mass-energy up into (or drains it from) the new species, the large neutrino mass-squared difference (104 eV² Dm2 108eV²) implies a huge amount of energy is released as gravity waves then in either neutrino convection and cooling or perturbed neutron star matter distributions. I identify the back-reaction force (mass and current multipoles) of the gravitational wave burst generated over the oscillation timescale as the pulsar thruster.

MASS LEAKING IN THE BRANEWORLD AND
FORMATION OF CHARGED BLACK HOLES

Herman J. Mosquera Cuesta

CBPF

In theories with an infinite extra dimension, free particles localized on the brane can leak out to the extra space. We argue that if there were color confinement in the bulk, electrons would be more able to escape than quarks and than protons (which are composed states). This generates an electric charge asymmetry on brane matter densities. A primordial charge asymmetry during Big Bang Nucleosynthesis era is predicted. We use current bounds on this and on electron disappearance to constrain the parameter space of these models. Although the generated asymmetry is generically small, it could be particularly enhanced on large densities as in astrophysical objects, like massive stars. We suggest the possibility that such accumulation of charge may be linked, upon supernova collapse, to the formation of a charged Black Hole and the generation of Gamma-Ray Bursts.