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18 papers · 2 filters
Eternal inflation, bubble collisions, and the persistence of memory
Jaume Garriga, Alan H. Guth, Alexander Vilenkin
A ``bubble universe'' nucleating in an eternally inflating false vacuum will experience, in the course of its expansion, collisions with an infinite number of other bubbles. In an…
Aspects of spinorial geometry
U. Gran, J. Gutowski, G. Papadopoulos +1
We review some aspects of the spinorial geometry approach to the classification of supersymmetric solutions of supergravity theories. In particular, we explain how spinorial geomet…
Dimensional reduction, truncations, constraints and the issue of consistency
Josep M. Pons
A brief overview of dimensional reductions for diffeomorphism invariant theories is given. The distinction between the physical idea of compactification and the mathematical proble…
N=31, D=11
U. Gran, J. Gutowski, G. Papadopoulos +1
We show that eleven-dimensional supergravity backgrounds with thirty one supersymmetries, N=31, admit an additional Killing spinor and so they are locally isometric to maximally su…
On the way from matter-dominated era to dark energy universe
Shin'ichi Nojiri, Sergei D. Odintsov, Hrvoje Stefancic
We develop the general program of the unification of matter-dominated era with acceleration epoch for scalar-tensor theory or dark fluid. The general reconstruction of single scala…
Dynamics and Stability of Black Rings
Henriette Elvang, Roberto Emparan, Amitabh Virmani
We examine the dynamics of neutral black rings, and identify and analyze a selection of possible instabilities. We find the dominating forces of very thin black rings to be a Newto…