A Dynamical Mechanism for the Big Bang and Non-Regularizability for $w=1$

TL;DR

This paper investigates a contracting universe transitioning through a big bang with a time-varying equation of state approaching 1, revealing the singularity's non-regularizability and proposing a dynamical mechanism involving an extended big bang state.

Contribution

It introduces a novel dynamical mechanism for the big bang involving an extended state and analyzes the non-regularizability of the singularity when w approaches 1.

Findings

The singularity at w=1 is non-regularizable with infinitely many extensions.

An extended big bang state is defined using a new time variable N, where w varies continuously.

The mechanism provides a complete dynamical description of the big bang transition.

Abstract

We consider a contracting universe and its transition to expansion through the big bang singularity with a time varying equation of state $w$, where $w$ approaches $1$ as the universe contracts to the big bang. We show that this singularity is non-regularizable. That is, there is no unique extension of the physical quantities after the transition, but rather infinitely many. This is entirely different from the case of $w > 1$ studied in \cite{Xue:2014}, where $w$ approaches a constant value $w_c > 1$ as the universe contracts. In that case a continuous transition through the big bang to yield a unique extension was possible only for a discrete set of $w_c$ satisfying coprime conditions. We also show that there exists another time variable, $N$, at the big bang singularity itself, at $t=0$, where $w$, varies as a function of $N$. This defines an {\em extended big bang state}. Within it, $H$ is infinity. In the extended state, $w$ varies from a universe dominated by the cosmological constant to $1$. After $w$ reaches $1$ then the big bang occurs and time $t >0$ resumes. This gives a dynamical mechanism for the big bang that is mathematically complete as a function of $N$. Dynamical systems methods are used with classical modeling.