24-28 June 2019
CERN
Europe/Zurich timezone
There is a live webcast for this event.

No-Go theorems for ekpyrosis from ten-dimensional supergravity

25 Jun 2019, 14:30
15m
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

100
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Speaker

Kunihito Uzawa (Kwansei Gakuin University)

Description

In this talk, we present whether the new ekpyrotic scenario can be embedded into ten-dimensional supergravity. We use that the scalar potential obtained from flux compactifications of type II supergravity with sources has a universal scaling with respect to the dilaton and the volume mode. Similar to the investigation of inflationary models, we find very strong constraints ruling out ekpyrosis from analyzing the fast-roll conditions. We conclude that flux compactifications tend to provide potentials that are neither too flat and positive (inflation) nor too steep and negative (ekpyrosis).

Presentation Materials