Dynamical Evolution of an Unstable Gravastar with Zero Mass

TL;DR

This paper investigates the evolution of a zero-mass gravastar, revealing it cannot form a stable structure and instead collapses into a non-interacting, point-like defect without an event horizon.

Contribution

It provides a physical interpretation of a zero-mass gravastar solution and demonstrates its collapse into a non-gravitational, topological defect, which is a novel insight.

Findings

No stable gravastar forms at zero mass.

Collapse results in a non-interacting, point-like topological defect.

Exterior spacetime remains de Sitter vacuum during collapse.

Abstract

Using the conventional gravastar model, that is, an object constituted by two components where one of them is a massive infinitely thin shell and the other one is a de Sitter interior spacetime, we physically interpret a solution characterized by a zero Schwarzschild mass. No stable gravastar is formed and it collapses without forming an event horizon, originating what we call a massive non-gravitational object. The most surprise here is that the collapse occurs with an exterior de Sitter vacuum spacetime. This creates an object which does not interact gravitationally with an outside test particle and it may evolve to a point-like topological defect.