CoCo 2o2o: Cosmology in Colombia

Dark Energy from Coupled p−forms

23 Sept 2020, 14:20

20m

CoCo

Speaker

Alejandro Guarnizo (Universidad Antonio Nariño)

Description

In this work we study the possibility to obtain an accelerated expansion from arbitrary couplings between $p$-forms in a 4-dimensional space-time. The Lagrangian is built with couplings between 1- and 2-forms with kinetic functions of a scalar field $\varphi$ (a quintessence field in this context). By using a dynamical system approach, we study the evolution of the fields in an anisotropic background, which is a natural framework to show if the interaction between $p$-forms can sustain a non-negligible shear. In addition, we found conditions for the cosmological viability of a dark energy dominated epoch. The evolution and stability is also confirmed by numerical integrations.

Presentation materials

Coco_2020_AGT.pdf