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9 papers · 2 filters
Regular Black Holes and Topology Change
Arvind Borde
The conditions are clarified under which regular (i.e., singularity-free) black holes can exist. It is shown that in a large class of spacetimes that satisfy the weak energy condit…
Singularities in Inflationary Cosmology: A Review
Arvind Borde, Alexander Vilenkin
We review here some recent results that show that inflationary cosmological models must contain initial singularities. We also present a new singularity theorem. The question of th…
Gravitational radiation from monopoles connected by strings
X. Martin, A. Vilenkin
Monopole-antimonopole pairs connected by strings can be formed as topological defects in a sequence of cosmological phase transitions. Such hybrid defects typically decay early in…
Cosmic Strings and the String Dilaton
Thibault Damour, Alexander Vilenkin
The existence of a dilaton (or moduli) with gravitational-strength coupling to matter imposes stringent constraints on the allowed energy scale of cosmic strings, . In particula…
In defence of the `Tunneling' wave function of the Universe
J. Garriga, A. Vilenkin
The tunneling approach to the wave function of the universe has been recently criticized by Bousso and Hawking who claim that it predicts a catastrophic instability of de Sitter sp…
Partition Function for (2+1)-Dimensional Einstein Gravity
Masafumi Seriu
Taking (2+1)-dimensional pure Einstein gravity for arbitrary genus as a model, we investigate the relation between the partition function formally defined on the entire phase s…