Counterexample to the passive topological censorship of K(pi,1) prime factors

TL;DR

This paper presents a counterexample in general relativity showing that certain topological features of spacetime are not hidden from observers, challenging previous assumptions about topological censorship.

Contribution

It provides a specific counterexample to the passive topological censorship conjecture for K(pi,1) prime factors in asymptotically flat spacetimes.

Findings

Counterexample spacetime with non-negative energy density

Demonstrates not all topological features are passively censored

Contradicts previous topological censorship arguments

Abstract

A globally hyperbolic asymptotically flat spacetime is presented (having non-negative energy density and pressures) that shows that not all K(pi,1) prime factors of the Cauchy surface topology are passively censored according to asymptotic observers in contradiction to an argument of Friedman, Schleich, and Witt.