We contrast the initial condition requirements of various contemporary cosmological models
including inflationary and bouncing cosmologies. Canonical quantization of general …

The quantum creation of universes with compact spacelike sections that have curvature k
either closed, flat, or open, ie, k=±1, 0, is studied. In the flat and open cases, the …

We derive exact series solutions for the Wheeler–DeWitt equation corresponding to a
spatially closed Friedmann–Robertson–Walker universe with cosmological constant for …

The maximal symmetry, or perfect cosmological principle (PCP), that prevents AdS-type
spaces from degenerating into anti-inflationary collapse is argued to be unphysical. For …

Euclidean wormholes first appeared in the Euclidean path integral approach to quantum
gravity. In a more general way, Hawking and Page interpreted such configurations as …

We contrast the possibility of inflation starting (a) from the universe's inception or (b) from an
earlier noninflationary state. Neither case is ideal since (a) assumes that quantum …

We study a model of quantum cosmology originating from a classical model of gravitation
where a self-interacting scalar field is coupled to gravity with the metric undergoing a …

Abstract Cotsakis et al.[Phys. Rev. D 49, 6489 (1994)] claimed that wormhole solutions can
be obtained with real scalar fields which could in turn be simulated with higher order gravity …

We study the classical and quantum euclidean wormholes for an empty (4+ 1) dimensional
Kaluza–Klein universe with a positive cosmological constant and a spatially flat Robertson …

We study the classical and quantum wormholes for a flat Euclidean Friedmann-Robertson-
Walker metric with a perfect fluid including an ordinary matter source plus a source playing …