Kerr-NUT-de Sitter as an Inhomogeneous Non-Singular Bouncing Cosmology

Understand

We present exact non-singular bounce solutions of general relativity in the presence of a positive cosmological constant and an electromagnetic field, without any exotic matter.

• The solutions are distinguished by being spatially inhomogeneous in one direction, while they can also contain non-trivial electromagnetic field lines.
• The inhomogeneity may be substantial, for instance, there can be one bounce in one region of the universe and two bounces elsewhere.
• Since the bounces are followed by a phase of accelerated expansion, the metrics described here also permit the study of (geodesically complete) models of inflation with inhomogeneous initial conditions.