Fundamental Concepts
Cosimo Bambi, Sourabh Nampalliwar

TL;DR
This chapter reviews the fundamental properties, observational evidence, and future challenges related to black holes in general relativity, highlighting the role of high-energy astrophysical observations and open research questions.
Contribution
It provides a comprehensive overview of black hole properties, discoveries, observational techniques, and outlines open problems and future directions in black hole research.
Findings
Black holes have unique properties predicted by general relativity.
Astrophysical black holes are observed through X-ray and gamma-ray emissions.
Several open problems and future research directions are identified.
Abstract
This chapter briefly discusses the fundamental properties of black holes in general relativity, the discovery of astrophysical black holes and their main astronomical observations, how X-ray and -ray facilities can study these objects, and ends with a list of open problems and future developments in the field.
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