Inflation near a metastable de Sitter vacuum from moduli stabilisation

Antoniadis, Ignatios; Lacombe, Osmin; Leontaris, George K. (2020). Inflation near a metastable de Sitter vacuum from moduli stabilisation. The European physical journal. C, Particles and fields, 80(11) Springer 10.1140/epjc/s10052-020-08581-9

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We study the cosmological properties of a metastable de Sitter vacuum obtained recently in the framework of type IIB flux compactifications in the presence of three D7-brane stacks, based on perturbative quantum corrections at both world-sheet and string loop level that are dominant at large volume and weak coupling. In the simplest case, the model has one effective parameter controlling the shape of the potential of the inflaton which is identified with the volume modulus. The model provides a phenomenological successful small-field inflation for a value of the parameter that makes the minimum very shallow and near the maximum. The horizon exit is close to the inflection point while most of the required e-folds of the Universe expansion are generated near the minimum, with a prediction for the ratio of tensor-to-scalar primordial fluctuations r∼4×10−4. Despite its shallowness, the minimum turns out to be practically stable. We show that it can decay only through the Hawking-Moss instanton leading to an extremely long decay rate. Obviously, in order to end inflation and obtain a realistic model, new low-energy physics is needed around the minimum, at intermediate energy scales of order 1012 GeV. An attractive possibility is by introducing a "waterfall"' field within the framework of hybrid inflation.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Antoniadis, Ignatios

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

16 Nov 2020 13:23

Last Modified:

22 Nov 2020 02:50

Publisher DOI:

10.1140/epjc/s10052-020-08581-9

ArXiv ID:

2007.10362

BORIS DOI:

10.7892/boris.147907

URI:

https://boris.unibe.ch/id/eprint/147907

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