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4 papers · 2 filters
Cosmological stretching of perturbations on a cosmic string
Christian Stephan-Otto, Ken D. Olum, Xavier Siemens
We investigate the effects of cosmological expansion on the spectrum of small-scale structure on a cosmic string. We simulate the evolution of a string with two modes that differ i…
The Effects of Stress Tensor Fluctuations upon Focusing
J. Borgman, L. H. Ford
We treat the gravitational effects of quantum stress tensor fluctuations. An operational approach is adopted in which these fluctuations produce fluctuations in the focusing of a b…
Creation of massive particles in a tunneling universe
Jooyoo Hong, Alexander Vilenkin, Serge Winitzki
We examine the particle production during tunneling in quantum cosmology. We consider a minisuperspace model with a massive, conformally coupled scalar field and a uniform radiatio…
The Classical Singularity Theorems and their Quantum Loopholes
L. H. Ford
The singularity theorems of classical general relativity are briefly reviewed. The extent to which their conclusions might still apply when quantum theory is taken into account is…