TL;DR
This paper reviews the concept of black hole entropy, discusses related puzzles, and explores how violations of energy conditions can lead to unexpected entropy behaviors at the event horizon.
Contribution
It provides a brief overview of black hole entropy issues and highlights the impact of energy condition violations on entropy behavior.
Findings
Black hole entropy has unresolved puzzles.
Violating energy conditions can alter entropy behavior.
Unexpected entropy phenomena occur at the event horizon.
Abstract
The notion of black-hole entropy was introduced by Jacob Bekenstein in 1972. During past 45 years this subject was in the center of interests of the modern theoretical physics. In this paper we briefly discuss "puzzles" of the black-hole physics, connected with their entropy. We also demonstrate that when the standard energy conditions are violated entropy associated with the event horizon can have quite unexpected behavior.
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Taxonomy
TopicsCosmology and Gravitation Theories · Relativity and Gravitational Theory · Black Holes and Theoretical Physics