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 study wormhole as the solution of the Wheeler–DeWitt (WdW) equation satisfying
Hawking–Page wormhole boundary conditions in Friedmann–Robertson–Walker (FRW) …

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

In a recent paper1 Euclidean wormhole solution has been obtained with a vacuum Brans–
Dicke theory with parameter ω= 0. These wormholes suffer from unphysical values of the …

Closed timelike curves (CTCs) form an interesting class of objects within the general theory
of relativity as they present the possibility for an observer to travel back in time …