An elementary introduction is given to the problem of black hole entropy as formulated by Bekenstein and Hawking. The information theoretic basis of Bekenstein's formulation is briefly surveyed, and compared with Hawking's approach. The issue of calculating the entropy by actual counting of microstates is taken up next, within two currently popular approaches to quantum gravity, viz., superstring theory and canonical quantum gravity. The treatment of the former assay is confined to a few remarks, mainly of a critical nature, while some computational techniques of the latter approach are elaborated. The author concludes by trying to find commonalities between these two rather disparate directions of work.
Indian Journal of Physics Section B
- Pub Date:
- April 1999
- Black Holes: Entropy;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- 13 pages, Revtex, 5 eps figures. Invited talk at National Symposium on Trends and Perspectives in Theoretical Physics, IACS, Calcutta, India, April, 1998. One reference added