Anatomy of Malicious Singularities

TL;DR

This paper investigates malicious singularities in space-time models, showing they cause topological collapse to a point and are probabilistically irrelevant when analyzed through noncommutative geometry.

Contribution

It introduces a framework linking malicious singularities to equivalence relations on the frame bundle and applies noncommutative geometry to analyze their properties.

Findings

Malicious singularities cause the space-time structure to collapse to a single point.

Noncommutative algebraic methods reveal these singularities are probabilistically irrelevant.

Conditions for the occurrence of malicious singularities are formulated.

Abstract

As well known, the b-boundaries of the closed Friedman world model and of Schwarzschild solution consist of a single point. We study this phenomenon in a broader context of differential and structured spaces. We show that it is an equivalence relation $\rho $, defined on the Cauchy completed total space $\bar{E}$ of the frame bundle over a given space-time, that is responsible for this pathology. A singularity is called malicious if the equivalence class $[p_0]$ related to the singularity remains in close contact with all other equivalence classes, i.e., if $p_0 \in \mathrm{cl}[p]$ for every $p \in E$. We formulate conditions for which such a situation occurs. The differential structure of any space-time with malicious singularities consists only of constant functions which means that, from the topological point of view, everything collapses to a single point. It was noncommutative geometry that was especially devised to deal with such situations. A noncommutative algebra on $\bar{E}$, which turns out to be a von Neumann algebra of random operators, allows us to study probabilistic properties (in a generalized sense) of malicious singularities. Our main result is that, in the noncommutative regime, even the strongest singularities are probabilistically irrelevant.