Entropy of Intermediate-Mass Black Holes

TL;DR

This paper discusses the entropy contribution of intermediate-mass black holes (IMBHs) in galactic halos, highlighting their potential to surpass supermassive black holes in entropy and exploring their formation and observational constraints.

Contribution

It provides an analysis of the entropy of IMBHs and their significance in dark matter halos, offering new insights into their role in cosmic entropy budget.

Findings

IMBHs could account for up to 10% of halo dark matter

IMBHs can contribute more entropy than supermassive black holes

Observational limits still allow significant IMBH populations

Abstract

Observational searches for Intermediate-Mass Black Holes (IMBHs), defined to have masses between 30 and 300,000 solar masses, provide limits which allow up to ten percent of what is presently identified as halo dark matter to be in the form of IMBHs. These concentrate entropy so efficiently that the halo contribution can be bigger than the core supermassive black hole. Formation of IMBHs is briefly discussed.