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11 papers · 2 filters
Radiation from cosmic string standing waves
Ken D. Olum, J. J. Blanco-Pillado
We have simulated large-amplitude standing waves on an Abelian-Higgs cosmic string in classical lattice field theory. The radiation rate falls exponentially with wavelength, as one…
Eternal inflation, black holes, and the future of civilizations
J. Garriga, V. F. Mukhanov, K. D. Olum +1
We discuss the large-scale structure of the universe in inflationary cosmology and the implications that it may have for the long-term future of civilizations. Although each civili…
On likely values of the cosmological constant
Jaume Garriga, Alexander Vilenkin
We discuss models in which the smallness of the effective vacuum energy density and the coincidence of the time of its dominance with the epoch of galaxy formation $t_G…
Energy Crisis in Astrophysics (Black Holes vs. N-Body Metrics)
Carroll O. Alley, Darryl L. Leiter, Yutaka Mizobuchi +1
The recent observation of the gamma ray burster GRB 990123, requiring at least two solar masses of energy in gamma radiation alone, created an energy crisis in astrophysics (Schill…
The cosmological constant and the time of its dominance
Jaume Garriga, Mario Livio, Alexander Vilenkin
We explore a model in which the cosmological constant and the density contrast at the time of recombination are random variables, whose range and {\it a priori} proba…
Noninteracting dark matter
P. J. E. Peebles, A. Vilenkin
Since an acceptable dark matter candidate may interact only weakly with ordinary matter and radiation, it is of interest to consider the limiting case where the dark matter interac…