588 citations · 1.7k across the 10 of their papers we have counts for
10 papers
Inflationary spacetimes are not past-complete
Arvind Borde, Alan H. Guth, Alexander Vilenkin
Many inflating spacetimes are likely to violate the weak energy condition, a key assumption of singularity theorems. Here we offer a simple kinematical argument, requiring no energ…
Constraints on Spatial distributions of Negative Energy
Arvind Borde, L. H. Ford, Thomas A. Roman
This paper initiates a program which seeks to study the allowed spatial distributions of negative energy density in quantum field theory. Here we deal with free fields in Minkowski…
Creation and Structure of Baby Universes in Monopole Collisions
Arvind Borde, Mark Trodden, Tanmay Vachaspati
Under certain circumstances, the collision of magnetic monopoles, topologically locked-in regions of false vacuum, leads to topological inflation and the creation of baby universes…
Violations of the Weak Energy Condition in Inflating Spacetimes
Arvind Borde, Alex Vilenkin
We argue that many future-eternal inflating spacetimes are likely to violate the weak energy condition. It is possible that such spacetimes may not enforce any of the known average…
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…