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

Shift Symmetric Orbital Inflation

25 Jun 2019, 15:45
15m
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

100
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Speaker

Yvette Welling (Deutsches Elektronen-Synchrotron DESY)

Description

Recent swampland conjectures highlight again the importance of finding viable scenarios for inflation that are not strictly single-field. In particular, one may wonder whether there are multi-field inflationary scenarios that have a similar phenomenology to single field inflation. We present a family of exact models of inflation - dubbed Orbital Inflation - in which the multi-field effects are significant, but the phenomenology remains similar to single field inflation. This simple predictions have a dynamic origin, and are non-trivial, as the isocurvature perturbations are exactly massless. The effective action of perturbations inherits a symmetry from an equivalence between background solutions. We comment on how our results could be connected to symmetries of the UV theory.

Presentation Materials