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27 papers · 2 filters
Dark Energy and the Return of the Phoenix Universe
Jean-Luc Lehners, Paul J. Steinhardt
In cyclic universe models based on a single scalar field (e.g., the radion determining the distance between branes in M-theory), virtually the entire universe makes it through the…
Dark Energy, Inflation and Extra Dimensions
Paul J. Steinhardt, Daniel Wesley
We consider how accelerated expansion, whether due to inflation or dark energy, imposes strong constraints on fundamental theories obtained by compactification from higher dimensio…
Multi-Field Inflation on the Landscape
Diana Battefeld, Thorsten Battefeld
We examine a wide class of multi-field inflationary models based on fields that decay or stabilize during inflation in a staggered fashion. The fields driving assisted inflation ar…
Giant magnons and spiky strings on the conifold
Sergio Benvenuti, Erik Tonni
We find explicit solutions for giant magnons and spiky strings on the squashed three dimensional sphere. For a special value of the squashing parameter the solutions describe strin…
The N=2 cascade revisited and the enhancon bearings
Francesco Benini, Matteo Bertolini, Cyril Closset +1
Supergravity backgrounds with varying fluxes generated by fractional branes at non-isolated Calabi-Yau singularities had escaped a precise dual field theory interpretation so far.…
I-odd sector of the Klebanov-Strassler theory
Anatoly Dymarsky, Dmitry Melnikov, Alexander Solovyov
The Klebanov-Strassler background is invariant under the Z_2 symmetry I, which acts by exchanging the bi-fundamental fields A and B, accompanied by the charge conjugation. We study…