Cosmological Entropy and Black Holes in Galactic Halos

TL;DR

This paper explores the role of intermediate and larger mass black holes in galactic halos, emphasizing their contribution to the universe's entropy and suggesting that dark energy significantly influences cosmic entropy levels.

Contribution

It proposes considering larger black hole masses up to 10^6 M_sun for entropy calculations, expanding beyond previous MACHO search ranges.

Findings

Dark energy contributes 99% of total entropy.

Black holes up to 10^6 M_sun are relevant for cosmic entropy.

Intermediate mass black holes amplify distant sources.

Abstract

In this talk we discuss intermediate mass black holes (IMBHs) by their amplilification of distant sources; MACHO searches have studied event times $2 h \lesssim t_0 \lesssim 2 y$ corresponding masses in the range $10^{-6} M_{\odot} \lesssim M \lesssim 100 M_{\odot}$. We suggest that larger masses up to $10^6 M_{\odot}$ are also of considerable interest by arguments about the entropy of the universe. One percent by mass of dark energy can provide ninety-nine percent of total entropy.