27 citations · 32 across the 3 of their papers we have counts for
4 papers
Global String Instantons
Jose J. Blanco-Pillado, Georgios Fanaras, Alexander Vilenkin
We study the formation of gravitating global strings through quantum mechanical tunneling. The instantons that describe the nucleation process are characterized by two parameters:…
Quantum cosmology, eternal inflation, and swampland conjectures
Georgios Fanaras, Alexander Vilenkin
In light of the recent swampland conjectures, we explore quantum cosmology and eternal inflation beyond the slow roll regime. We consider a model of a closed universe with a scalar…
The tunneling wavefunction in Kantowski-Sachs quantum cosmology
Georgios Fanaras, Alexander Vilenkin
We use a path-integral approach to study the tunneling wave function in quantum cosmology with spatial topology and positive cosmological constant (the Kantowsk…
Friedmann-like universes with weak torsion: a dynamical system approach
J. D. Barrow, C. G. Tsagas, G. Fanaras
We consider Friedmann-like universes with torsion and take a step towards studying their stability. In so doing, we apply dynamical-system techniques to an autonomous system of dif…