English

Two-field Cosmological $\alpha$-attractors with Noether Symmetry

High Energy Physics - Theory 2019-04-29 v3

Abstract

We study Noether symmetries in two-field cosmological α\alpha-attractors, investigating the case when the scalar manifold is an elementary hyperbolic surface. This encompasses and generalizes the case of the Poincare disk. We solve the conditions for the existence of a `separated' Noether symmetry and find the form of the scalar potential compatible with such, for any elementary hyperbolic surface. For this class of symmetries, we find that the α\alpha-parameter must have a fixed value. Using those Noether symmetries, we also obtain many exact solutions of the equations of motion of these models, which were studied previously with numerical methods.

Keywords

Cite

@article{arxiv.1809.10563,
  title  = {Two-field Cosmological $\alpha$-attractors with Noether Symmetry},
  author = {Lilia Anguelova and Elena Mirela Babalic and Calin Iuliu Lazaroiu},
  journal= {arXiv preprint arXiv:1809.10563},
  year   = {2019}
}

Comments

65 pages; references and appendix added