1.4k citations · 4k across the 44 of their papers we have counts for
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Patching up the No-Boundary Proposal with virtual Euclidean wormholes
Raphael Bousso, Andrew Chamblin
In quantum cosmology, one often considers tunneling phenomena which may have occurred in the early universe. Processes requiring quantum penetration of a potential barrier include…
Abelian Higgs hair for extreme black holes and selection rules for snapping strings
A. Chamblin, J. M. A. Ashbourn-Chamblin, R. Emparan +1
It has been argued that a black hole horizon can support the long range fields of a Nielsen-Olesen string, and that one can think of such a vortex as black hole ``hair''. We show t…
Can extreme black holes have (long) Abelian Higgs hair?
A. Chamblin, J. M. A. Ashbourn-Chamblin, R. Emparan +1
It has been argued that a black hole horizon can support the long range fields of a Nielsen-Olesen string, and that one can think of such a vortex as black hole ``hair''. In this p…
Nucleating Black Holes via Non-Orientable Instantons
A. Chamblin, G. W. Gibbons
We extend the analysis of black hole pair creation to include non- orientable instantons. We classify these instantons in terms of their fundamental symmetries and orientations. Ma…
Topology and Time Reversal
Andrew Chamblin, G. W. Gibbons
In this lecture we address some topological questions connected with the existence on a general spacetime manifold of diffeomorphisms connected to the identity which reverse the ti…
Some applications of differential topology in general relativity
Andrew Chamblin
Recently, there have been several applications of differential and algebraic topology to problems concerned with the global structure of spacetimes. In this paper, we derive obstru…
On the Obstructions to non-Cliffordian Pin Structures
Andrew Chamblin
We derive the topological obstructions to the existence of non-Cliffordian pin structures on four-dimensional spacetimes. We apply these obstructions to the study of non-Cliffordia…
Topology and Causal Structure
Andrew Chamblin
We investigate the causal structure of spacetimes for which the metric is singular on a set of points.
Obstructions to Pin Structures on Kleinian Manifolds
L. J. Alty, A. Chamblin
We develop various topological notions on four-manifolds of Kleinian signature . In particular, we extend the concept of `Kleinian metric homotopy' to non-orientable man…
A Judgement on Sinors
Andrew Chamblin, G. W. Gibbons
This note contains some comments on a recent paper by Friedman on two-component spinors in spacetimes which do not admit a time-orientation, and is intended to clarify the relation…
Kinks and Time Machines
Andrew Chamblin, Gary Gibbons, Alan R. Steif
We show that it is not possible to smooth out the metric on the Deutsch-Politzer time machine to obtain an everywhere non-singular asymptotically flat Lorentzian metric.