Black Holes Constitute All Dark Matter

TL;DR

This paper proposes that all dark matter consists of intermediate-mass black holes, which dominate the universe's entropy, suggesting a new perspective on dark matter composition and cosmic entropy.

Contribution

It introduces the idea that intermediate-mass black holes could account for all dark matter and dominate the universe's entropy, providing a novel hypothesis.

Findings

Entropy bounds for the universe are established.

Intermediate-mass black holes are proposed as the sole dark matter component.

Black holes dominate the universe's entropy.

Abstract

The dimensionless entropy, ${\cal S} \equiv S/k$, of the visible universe, taken as a sphere of radius 50 billion light years with the Earth at its "center", is discussed. An upper limit ($10^{112}$), and a lower limit ($10^{102}$), for ${\cal S}$ are introduced. It is suggested that intermediate-mass black holes (IMBHs) constitute all dark matter, and that they dominate ${\cal S}$.