Ricci Reheating

Opferkuch, Toby; Schwaller, Pedro; Stefanek, Ben A.

doi:10.1088/1475-7516/2019/07/016

Ricci Reheating

Toby Opferkuch
(
- CERN
)
,
Pedro Schwaller
(
- U. Mainz, PRISMA
)
,
Ben A. Stefanek
(
- U. Mainz, PRISMA
)

May 14, 2019

15 pages

Published in:

JCAP 07 (2019) 016

Published: Jul 10, 2019

e-Print:

1905.06823 [gr-qc]

DOI:

10.1088/1475-7516/2019/07/016

Report number:

CERN-TH-2019-063,
MITP/19-032

View in:

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Abstract: (IOP)

We present a model for viable gravitational reheating involving a scalar field directly coupled to the Ricci curvature scalar. Crucial to the model is a period of kination after inflation, which causes the Ricci scalar to change sign thus inducing a tachyonic effective mass m2 −H2 for the scalar field. The resulting tachyonic growth of the scalar field provides the energy for reheating, allowing for temperatures high enough for thermal leptogenesis. Additionally, the required period of kination necessarily leads to a blue-tilted primordial gravitational wave spectrum with the potential to be detected by future experiments. We find that for reheating temperatures TRH 1 GeV, the possibility exists for the Higgs field to play the role of the scalar field.

Note:

9 pages, 6 figures

field theory: scalar
scalar: Ricci
temperature: reheating
curvature: scalar
curvature: Ricci
gravitational radiation: primordial
gravitational radiation: spectrum
leptogenesis: thermal
temperature: high
tachyon

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Figures(9)

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