Black hole and entropy
July 7, 2009 Leave a comment
Solodukhin, S. (1998). Entropy of the Schwarzschild black hole and the string–black-hole correspondence Physical Review D, 57 (4), 2410-2414 DOI: 10.1103/PhysRevD.57.2410
Black Holes and Entropy
The idea that black holes have entropy, was first given by Jacob Bekenstein in 1970. If something has entropy it must have temperature , thus it should radiate energy which was hard to imagine at that time when sci fi were showing nothing can escape from a black hole. After a long debate and calculations lead Hawking to accept that uncertainty principle allow to escape from a black hole. During the quantum fluctations , pairs of particle are generated. Hawking’s theory predicts that the pair production of particles will be greater where the curvature of space time is most severe and changing most rapidly. We can expect to find many particle pairs at the event horizon of a black hole. Under conditions near the horizon, tidal effects of gravity can pull the pairs apart with enormous force. That feed enough energy into them to change the virtual particles into real particles. As real particles, they don’t have to meet again and annihilate one anothe. Two newly created particles at the event horizon excagbogd energy,one ending up with negative energy and the other with positive energy. The negative energy particles goes below the event horizon to the singularity. The energy particles may either pulled by black hole or escape to distance outside the black hole, making off with the borrowed. To an observer at a distance the particle appears to come out of the black hole. In fact it comes from event horizon. Hawking radiation is a part of this process. Thus black hole is thermodynamic system. This theory still needs more complication and research.