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Reheating after S-brane ekpyrosis

Jul 2, 2020

7 pages

Published in:

Phys.Rev.D 102 (2020) 6, 063514

Published: Sep 15, 2020

e-Print:

2007.01203 [hep-th]

DOI:

10.1103/PhysRevD.102.063514

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Abstract: (APS)

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. Gravitational 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.

Note:

7 pages, 1 figure, one reference added

Cosmology
gauge field theory: fluctuation
cosmological model: ekpyrotic
S-brane
reheating
mediation
Hubble constant
string model: Type IIB
Born-Infeld model

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