A classical, non-singular, bouncing universe

Understand

We present a model for a classical, non-singular bouncing cosmology without violation of the null energy condition (NEC).

• The field content is General Relativity plus a real scalar field with a canonical kinetic term and only renormalizable, polynomial type self-interaction for the scalar field in the Jordan frame.
• The universe begins vacuum-energy dominated and is contracting at $t=-\infty$.
• We consider a closed universe with a positive spatial curvature, which is responsible for the universe bouncing without any NEC violation.