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String creation and cosmology
Steven S. Gubser
I argue that string creation may have played a role in reheating the universe after inflation. For strings in four dimensions that arise from branes wrapping cycles in the extra di…
Degenerate eigenvalues for Hamiltonians with no obvious symmetries
Steven S. Gubser, Robert K. Bradley
Certain Hamiltonians based on two coupled quantum mechanical spins exhibit degenerate eigenvalues despite having no obvious non-abelian symmetries. Operators acting to permute the…
String production at the level of effective field theory
Steven S. Gubser
Pair creation of strings in time-dependent backgrounds is studied from an effective field theory viewpoint, and some possible cosmological applications are discussed. Simple estima…
Universality classes for horizon instabilities
Steven S. Gubser, Arkadas Ozakin
We introduce a notion of universality classes for the Gregory-Laflamme instability and determine, in the supergravity approximation, the stability of a variety of solutions, includ…