48 citations · 158 across the 7 of their papers we have counts for
7 papers
The Two--Point Correlation Function and the Size of Voids
Dalia S. Goldwirth, Luiz Nicolaci da Costa, Rien Van de Weygaert
Under the assumption of a void-filled Universe we investigate if the characteristic scale of voids can be determined from existing surveys. We use the Voronoi tessellation to creat…
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…
String-Dominated Cosmology
Dalia S. Goldwirth, Malcolm J. Perry
If string theory controls physics at the string scale, the dynamics of the early universe before the GUT era will be governed by the low-energy string equations of motion. Studying…
Limits on the Primordial Fluctuation Spectrum Void Sizes and CMBR Anisotropy
T. Piran, M. Lecar, D. S. Goldwirth +2
We suggest to use the common appearance of voids with a scale of $5000 \kms$ in the galaxy distribution to estimate the power spectrum on this scale. We use a simple model for a gr…
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…