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4 papers · 2 filters
Particle creation in a tunneling universe
J. Hong, A. Vilenkin, S. Winitzki
An expanding closed universe filled with radiation can either recollapse or tunnel to the regime of unbounded expansion, if the cosmological constant is nonzero. We re-examine the…
Spatially Averaged Quantum Inequalities Do Not Exist in Four-Dimensional Spacetime
L. H. Ford, Adam D. Helfer, Thomas A. Roman
We construct a particular class of quantum states for a massless, minimally coupled free scalar field which are of the form of a superposition of the vacuum and multi-mode two-part…
Static Negative Energies Near a Domain Wall
Ken D. Olum, Noah Graham
We show that a system of a domain wall coupled to a scalar field has static negative energy density at certain distances from the domain wall. This system provides a simple, explic…
On the size of the smallest scales in cosmic string networks
Xavier Siemens, Ken D. Olum, Alexander Vilenkin
We present a method for the calculation of the gravitational back reaction cutoff on the smallest scales of cosmic string networks taking into account that not all modes on strings…