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Primordial nucleosynthesis redux
The abundances of D, He-3, He-4, and Li-7, are presently recalculated within the framework of primordial nucleosynthesis in the standard hot big band model, in order to estimate the primordial
Nucleosynthesis, neutrino bursts and γ-rays from coalescing neutron stars
NEUTRON-STAR collisions occur inevitably when binary neutron stars spiral into each other as a result of damping of gravitational radiation. Such collisions will produce a characteristic burst of
Big-bang nucleosynthesis enters the precision era
The last parameter of big-bang nucleosynthesis, the baryon density, is being pinned down by measurements of the deuterium abundance in high-redshift hydrogen clouds. When it is determined, it will
Geological Isotope Anomalies as Signatures of Nearby Supernovae
Nearby supernova explosions may cause geological isotope anomalies via the direct deposition of debris or by cosmic-ray spallation in the earth's atmosphere. We estimate the mass of material
Could a nearby supernova explosion have caused a mass extinction?
  • J. Ellis, D. Schramm
  • Physics
    Proceedings of the National Academy of Sciences…
  • 2 March 1993
It is examined the possibility that a nearby supernova explosion could have caused one or more of the mass extinctions identified by paleontologists, and the possible rate of such events is discussed.
Neutrino Opacities at High Temperatures and Densities
A detailed calculation is made of the major cross sections contributing to neutrino opacities at high temperatures and densities such as those encountered in gravitational collapse. These
The tidal disruption of neutron stars by black holes in close binaries.
The formation of close, doubly compact binary systems from close massive binaries is considered. Massive X-ray binaries are shown to be possible progenitors of these systems. The recent observation
Dust in the Universe
The possible existence of intergalactic dust with properties similar to interstellar dust is examined in some detail. If such dust does exist, it could result in a correction to the observed