White Holes as the Asymptotic Limit of Evaporating Primordial Black Holes

TL;DR

This paper explores the relationship between primordial black holes and white holes, showing that Planck-sized black holes resemble white holes but do not fully replicate their zero-absorption property, challenging their thermodynamic equivalence.

Contribution

It demonstrates that Planck-sized primordial black holes cannot be considered true white holes due to non-zero absorption probabilities, refining the understanding of their thermodynamic nature.

Findings

Planck-sized PBHs closely simulate white holes

Absorption probability of Planck-sized PBHs is non-zero

Thermodynamically, they are not true white holes

Abstract

This paper examines the interaction of an intense fermion field with all of the particle species of an attometer primordial black hole's (PBH)'s high energy Hawking radiation spectrum. By extrapolating to Planck-sized PBH's, it is shown that, although Planck-sized PBH's closely simulate the zero absorption requirement of white holes, the absorption probability is not truly zero, and therefore, thermodynamically, Planck-sized PBH's are not true white holes.