6 citations · 6 across the 4 of their papers we have counts for
6 papers
Fermionic sectors for the Kodama state
Stephon Alexander, Kristin Schleich, Donald M. Witt
Diffeomorphisms not connected to the identity can act nontrivially on the quantum state space for gravity. However, in stark contrast to the case of nonabelian Yang-Mills field the…
The Gravitational Instability of the Vacuum: Insight into the Cosmological Constant Problem
Stephon Alexander, Manasse Mbonye, John Moffat
A mechanism for suppressing the cosmological constant is developed, based on an analogy with a superconducting phaseshift in which free fermions coupled perturbatively to a weak gr…
The geometrization of matter proposal in the Barrett-Crane model and resolution of cosmological problems
S. Alexander, L. Crane, M. D. Sheppeard
We give an overview of the current issues in early universe cosmology and consider the potential resolution of these issues in an as yet nascent spin foam cosmology. The model is t…
Non-Topological Inflation from Embedded Defects
Stephon Alexander, Robert Brandenberger, Moshe Rozali
We discuss a new mechanism of obtaining a period of cosmological inflation in the context of string theory. This mechanism is based on embedded defects which form dynamically on hi…
Attractive Forces Between Global Monopoles and Domain Walls
Stephon Alexander, Robert Brandenberger, Richard Easther
We study the interaction between stable monopoles and domain walls in a scalar field theory. Numerical simulations reveal that there is an attractive force betw…
On the Interaction of Monopoles and Domain Walls
Stephon Alexander, Robert Brandenberger, Richard Easther +1
We study the interaction between monopoles and embedded domain walls in a O(3) linear sigma model. We discover that there is an attractive force between the monopole and the wall.…