8,284 research outputs found
Neutrino emission, Equation of State and the role of strong gravity
Neutron-star mergers are interesting for several reasons: they are proposed
as the progenitors of short gamma-ray bursts, they have been speculated to be a
site for the synthesis of heavy elements, and they emit gravitational waves
possibly detectable at terrestrial facilities. The understanding of the merger
process, from the pre-merger stage to the final compact object-accreting system
involves detailed knowledge of numerical relativity and nuclear physics. In
particular, key ingredients for the evolution of the merger are neutrino
physics and the matter equation of state. We present some aspects of neutrino
emission from binary neutron star mergers showing the impact that the equation
of state has on neutrinos and discuss some spectral quantities relevant to
their detection such as energies and luminosities far from the source.Comment: 7 pages , 3 figures. XI LASNPA conference proceeding
Neutrinos and the synthesis of heavy elements: the role of gravity
The synthesis of heavy elements in the Universe presents several challenges.
From one side the astrophysical site is still undetermined and on other hand
the input from nuclear physics requires the knowledge of properties of exotic
nuclei, some of them perhaps accessible in ion beam facilities. Black hole
accretion disks have been proposed as possible r-process sites. Analogously to
Supernovae these objects emit huge amounts of neutrinos. We discuss the
neutrino emission from black hole accretion disks. In particular we show the
influence that the black hole strong gravitational field has on changing the
electron fraction relevant to the synthesis of elements.Comment: 5 pages, 5 figures, Invited talk at the 15th International Symposium
on Capture Gamma-Ray Spectroscopy and Related Topics (CGS15), to appear in
EPJ Web of Conference
Neutrino Scattering in Heterogeneous Supernova Plasmas
Neutrinos in core collapse supernovae are likely trapped by neutrino-nucleus
elastic scattering. Using molecular dynamics simulations, we calculate neutrino
mean free paths and ion-ion correlation functions for heterogeneous plasmas.
Mean free paths are systematically shorter in plasmas containing a mixture of
ions compared to a plasma composed of a single ion species. This is because
neutrinos can scatter from concentration fluctuations. The dynamical response
function of a heterogeneous plasma is found to have an extra peak at low
energies describing the diffusion of concentration fluctuations. Our exact
molecular dynamics results for the static structure factor reduce to the Debye
Huckel approximation, but only in the limit of very low momentum transfers.Comment: 11 pages, 13 figure
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