Reheating after S-Brane Ekpyrosis

Abstract

In recent work, two of us proposed a nonsingular Ekpyrotic cosmology making use of an S-brane which forms at the end of the phase of Ekpyrotic contraction. This S-Brane mediates a transition between contraction and expansion. Graviitational waves passing through the S-Brane acquire a roughly scale-invariant spectrum, and if the S-Brane has zero shear, then a roughly scale-invariant spectrum of cosmological perturbatiions results. Here, we study the production of gauge field fluctuations driven by the decay of the S-Brane, and we show that the reheating process via gauge field production will be efficient, leading to a radiation-dominated expanding phase.

7 pages, 1 figure, one reference added

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• Through a Black Hole into a New Universe
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
• Contracting Cosmologies and the Swampland
• Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
• String Theory and The Arrow of Time
• Limitations of an Effective Field Theory Treatment of Early Universe Cosmology
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• Trans-Planckian Censorship Conjecture and Early Universe Cosmology
• Low-Energy String Theory Predicts Black Holes Hide a New Universe
• de Sitter Excited State in Heterotic E_8 x E_8 Theory