48 citations · 158 across the 7 of their papers we have counts for
4 papers · 1 filter
Conditions for inflation in an initially inhomogeneous universe
Nathalie Deruelle, Dalia S. Goldwirth
Using a long wavelength iteration scheme to solve Einstein's equations near the Big-Bang singularity of a universe driven by a massive scalar field, we find how big initial quasi-i…
A Comment on Junction and Energy Conditions in Thin Shells
D. S. Goldwirth, J. Katz
This comment contains a suggestion for a slight modification of Israel's covariant formulation of junction conditions between two spacetimes, placing both sides on equal footing wi…
The Quantum Propagator for a Nonrelativistic Particle in the Vicinity of a Time Machine
Dalia S. Goldwirth, Malcolm J. Perry, Tsvi Piran +1
We study the propagator of a non-relativistic, non-interacting particle in any non-relativistic ``time-machine'' spacetime of the type shown in Fig.~1: an external, flat spacetime…
The Loss of Unitarity in the Vicinity of a Time Machine
Dalia S. Goldwirth, Malcolm J. Perry, Tsvi Piran
We construct the propagator of a non-relativistic non-interacting particle in a flat spacetime in which two regions have been identified. This corresponds to the simplest "time mac…