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10 papers · 2 filters
Null Energy Condition Violations in Eternal Inflation
Serge Winitzki
The usual scenario of ``eternal inflation'' involves an approximately de Sitter spacetime undergoing upward fluctuations of the local expansion rate . This spacetime requires fr…
Evolution of the discrepancy between a universe and its model
Masafumi Seriu
We study a fundamental issue in cosmology: Whether we can rely on a cosmological model to understand the real history of the Universe. This fundamental, still unresolved issue is o…
The eternal fractal in the universe
Serge Winitzki
Models of eternal inflation predict a stochastic self-similar geometry of the universe at very large scales and allow existence of points that never thermalize. I explore the fract…
Inflationary spacetimes are not past-complete
Arvind Borde, Alan H. Guth, Alexander Vilenkin
Many inflating spacetimes are likely to violate the weak energy condition, a key assumption of singularity theorems. Here we offer a simple kinematical argument, requiring no energ…
Constraints on Spatial distributions of Negative Energy
Arvind Borde, L. H. Ford, Thomas A. Roman
This paper initiates a program which seeks to study the allowed spatial distributions of negative energy density in quantum field theory. Here we deal with free fields in Minkowski…
Gravitational wave bursts from cusps and kinks on cosmic strings
Thibault Damour, Alexander Vilenkin
The strong beams of high-frequency gravitational waves (GW) emitted by cusps and kinks of cosmic strings are studied in detail. As a consequence of these beams, the stochastic ense…