# Evolution of Universes in Causal Set Cosmology

## TL;DR

This paper explores how causal set models of quantum gravity can describe universe creation events, such as black hole bounces, and suggests a mechanism for universe evolution consistent with cosmological natural selection.

## Contribution

It introduces a model for universe creation after black hole singularities within causal set cosmology, demonstrating parameter renormalisation in this context.

## Key findings

- Renormalisation of dynamical parameters occurs after universe creation events.
- Black hole bounces can be modeled as universe creation in causal set theory.
- Potential link to Smolin's Cosmological Natural Selection hypothesis.

## Abstract

The causal set approach to the problem of quantum gravity is based on the hypothesis that spacetime is fundamentally discrete. Spacetime discreteness opens the door to novel types of dynamical law for cosmology and the Classical Sequential Growth (CSG) models of Rideout and Sorkin form an interesting class of such laws. It has been shown that a renormalisation of the dynamical parameters of a CSG model occurs whenever the universe undergoes a Big Crunch-Big Bang bounce. In this paper we propose a way to model the creation of a new universe after the singularity of a black hole. We show that renormalisation of dynamical parameters occurs in a CSG model after such a creation event. We speculate that this could realise aspects of Smolin's Cosmological Natural Selection proposal.