361 citations · 1.2k across the 32 of their papers we have counts for
4 papers · 1 filter
Wormholes in String Theory
Dan N. Vollick
A wormhole is constructed by cutting and joining two spacetimes satisfying the low energy string equations with a dilaton field. In spacetimes described by the "string metric" the…
Maintaining a Wormhole with a Scalar Field
Dan N. Vollick
It is well known that it takes matter that violates the averaged weak energy condition to hold the throat of a wormhole open. The production of such ``exotic'' matter is usually di…
Negative Energy Density States for the Dirac Field in Flat Spacetime
Dan N. Vollick
Negative energy densities in the Dirac field produced by state vectors that are the superposition of two single particle electron states are examined. I show that for such states t…
The influence of the cosmological expansion on local systems
F. I. Cooperstock, V. Faraoni, D. N. Vollick
Following renewed interest, the problem of whether the cosmological expansion affects the dynamics of local systems is reconsidered. The cosmological correction to the equations of…