Accretion of a Phantom Scalar Field by a Black Hole: restrictions on the field distribution

TL;DR

This paper uses numerical simulations to investigate how a phantom scalar field accretes onto a black hole, revealing that thick wave packets with small wave numbers are inefficiently accreted, leaving some field outside.

Contribution

It provides new insights into the restrictions on scalar field distribution during black hole accretion, especially for phantom fields, through detailed numerical analysis.

Findings

Thick wave packets with small wave number are inefficiently accreted.

A portion of the scalar field remains outside the black hole after accretion.

The properties of the wave packet influence the accretion efficiency.

Abstract

Using numerical simulations we study the accretion of a phantom scalar field into a black hole and track the black hole horizon shrinking process. We integrate the amount of field left outside the black hole during the process in terms of the properties of the wave packet sent toward the black hole. Our results indicate that the accretion of thick wave packets with small wave number is inefficient and a portion of the scalar field remains outside the black hole.