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SUMMARY:Attractors\, Bifurcations and Curvature in Multi-Field inflation
DTSTART:20191021T140000
DTEND:20191021T153000
DTSTAMP:20260916T045155Z
UID:1e3630ad4587837fbf1d7698e116f00edd79e7bdef5cdda030f1ed2e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Evangelos Sfakianakis (Nikhef\, Amsterdam)\nRecent years have 
 seen the introduction of various multi-field inflationary scenarios\, in w
 hich the curvature and geodesics of the scalar manifold play a crucial rol
 e. I will outline a simple description that unifies these different propos
 als and discuss their stability criteria. I will demonstrate how the under
 lying dynamics is governed by an effective potential\, whose critical poin
 ts and bifurcations determine the late-time behaviour of the system\, thus
  unifying hyperinflation\, angular\, orbital and side-tracked inflation. I
 nterestingly\, hyperinflation can be shown to be a special case of side-tr
 acked inflation. This equivalence relies on the enhanced isometries of the
  hyperbolic manifold and I will show the explicit coordinate transformatio
 n that maps the two models into each other. In the case of angular inflati
 on\, the universal predictions of multi-field alpha attractors are modifie
 d\, allowing us to constrain the curvature of the hyperbolic manifold and 
 mass ratio of the two fields\, for certain models.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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