# A new kind of cyclic universe

## TL;DR

This paper proposes a novel cyclic universe model combining ekpyrotic contraction and a classical bounce, leading to a universe with oscillating parameters and exponential growth across cycles, addressing key cosmological problems.

## Contribution

It introduces a new cyclic cosmology framework that naturally incorporates a non-singular bounce and solves multiple fundamental cosmological issues.

## Key findings

- Resolves homogeneity, isotropy, flatness, and monopole problems.
- Generates a nearly scale-invariant density perturbation spectrum.
- Addresses issues beyond standard inflationary models.

## Abstract

Combining intervals of ekpyrotic (ultra-slow) contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the Hubble parameter, energy density and temperature oscillate periodically, but the scale factor grows by an exponential factor from one cycle to the next. The resulting cosmology not only resolves the homogeneity, isotropy, flatness and monopole problems and generates a nearly scale invariant spectrum of density perturbations, but it also addresses a number of age-old cosmological issues that big bang inflationary cosmology does not. There may also be wider-ranging implications for fundamental physics, black holes and quantum measurement.