Test the Weak Cosmic Supervision Conjecture in Dark Matter-Black Hole System

TL;DR

This paper investigates how perfect fluid dark matter influences the destruction of black hole event horizons, suggesting dark matter could potentially violate the weak cosmic censorship conjecture in Kerr-like black holes.

Contribution

It provides a detailed analysis of the effects of dark matter parameters on black hole horizon stability under test particles and scalar fields, revealing conditions that can lead to horizon destruction.

Findings

Dark matter can destroy extremal black hole horizons with test particles.

The event horizon destruction depends on the dark matter strength parameter.

Scalar field interactions can disrupt horizons for certain mode patterns and parameters.

Abstract

There is a possibility that the event horizon of a Kerr-like black hole with perfect fluid dark matter (DM) can be destroyed, providing a potential opportunity for understanding the weak cosmic censorship conjecture of black holes. In this study, we analyze the influence of the strength parameter of perfect fluid DM on the destruction of the event horizon of a Kerr-like black hole with spinning after injecting a test particle and a scalar field. We find that, when a test particle is incident on the black hole, the event horizon is destroyed by perfect fluid dark matter for extremal black holes. For nearly extremal black holes, when the dark matter parameter satisfies $\alpha \in \left (-r_{h} , 0\right ) \cup \left ( r_{h} ,k_2\right )$ i.e.$(A<0)$, the event horizon of the black hole will not be destroyed; when the dark matter parameter satisfies $\alpha \in\left ( k_1 ,-r_{h} \right ]\cup \left[0,r_{h}\right ]$ i.e.$(A\ge 0)$, the event horizon of the black hole will be destroyed. When a classical scalar field is incident into the black hole in the extremal black hole case, we find that the range of mode patterns of the scalar field that can disrupt the black hole event horizon is different for different values of the perfect fluid dark matter strength parameter. In the nearly extremal black hole case, through our analysis, we have found when $\alpha\neq0 $ and $\alpha\neq\pm\ r_h$ i.e.$A\neq0$, the event horizon of the black hole can be disrupted. Our research results indicate that dark matter might be capable of breaking the black hole horizon, thus potentially violating the weak cosmic censorship conjecture.