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A. Achúcarro, E. J. Copeland, O. Iarygina, G. A. Palma, D. G. Wang and Y. Welling, “Shift-Symmetric Orbital Inflation: single field or multi-field?,” arXiv:1901.03657 [astro-ph.CO]
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Then

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2019

Attractors, Bifurcations and Curvature in Multi-field Inflation

Christodoulidis, Perseas, Roest, Diederik, Sfakianakis, Evangelos I.

Understand

Recent years have seen the introduction of various multi-field inflationary scenarios in which the curvature and geodesics of the scalar manifold play a crucial role.

We outline a simple description that unifies these different proposals and discuss their stability criteria.
We demonstrate how the underlying dynamics is governed by an effective potential, whose critical points and bifurcations determine the late-time behaviour of the system, thus unifying hyperinflation, angular, orbital and side-tracked inflation.
Interestingly, we show that hyperinflation is a special case of side-tracked inflation, relying on the enhanced isometries of the hyperbolic manifold.