Thermodynamics of Black Holes: Theoretical Developments and Information Paradox

One of the most significant and puzzling and fecund fields of modern physics is the thermodynamics of black holes: a paradigm that has emerged through the meeting of general relativity with quantum field theory. These mysterious gravitational objects, which were thought to be empty darkness, have exposed highly thermodynamic features such as temperature, entropy, and evaporation. Black holes have been reinterpreted in a thermodynamic picture by the work of Bekenstein and Hawking, who found that classical views of event horizons and conservation laws are no longer valid. As a theoretical possibility, the Hawking radiation led to the introduction of a quantum mechanical instability of black hole spacetimes, unleashing an avalanche of discussions about the process of black hole evaporation, the fate of information, and the final geometry of spacetime. The information paradox that ensued because of the firewall hypothesis is what ardently raises debate even today. At the same time, the development of string theory and holography (especially in the realization of the Anti-de Sitter/Conformal Field Theory correspondence) has provided possible solutions as well by subsuming black hole entropy and unitarity into more encompassing theories. Thermodynamic basis, Hawking radiation, the entropy-area law, information paradox, and holographic advancement are discussed in a very systematic and critical way in this paper. The paper has helped to prove that the role of a black hole as an astrophysical object is just one of its dimensions because it can also be used to obtain a tool to unite quantum mechanics and gravity.