Dark energy models can be seen as dynamical systems. In this paper, we show that multifield models with a curved field space give rise to new critical points and we analyze their stability. These are new accelerating solutions in late-time cosmology which exist even for steep potentials. This opens up the possibility to realize quintessence models even when quantum corrections spoil the flatness of the underlying potential. These nonlinear sigma models arise naturally in supergravity and string models where their multifield dynamics can help to avoid swampland bounds.
Cicoli, M., Dibitetto, G., Pedro, F.g. (2020). New accelerating solutions in late-time cosmology. PHYSICAL REVIEW D, 101(10) [10.1103/PhysRevD.101.103524].
New accelerating solutions in late-time cosmology
Giuseppe Dibitetto;
2020-01-01
Abstract
Dark energy models can be seen as dynamical systems. In this paper, we show that multifield models with a curved field space give rise to new critical points and we analyze their stability. These are new accelerating solutions in late-time cosmology which exist even for steep potentials. This opens up the possibility to realize quintessence models even when quantum corrections spoil the flatness of the underlying potential. These nonlinear sigma models arise naturally in supergravity and string models where their multifield dynamics can help to avoid swampland bounds.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
