## Correlation and the black hole information loss problem

**Dongshan He;Qingyu Cai;College of Physics & Electronic Engineering, Xianyang Normal University;State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences;**

Information is physical, it cannot simply disappear in any physical process. This basic principle of information science constitutes one of the most important elements for the very foundation to our daily life and to our understanding of the universe. However, this fundamental principle is challenged by the physics of black holes. Classic black holes was viewed as only capable of absorbing but not emitting particles, so black holes look completely black. All matter that falls into the black hole will be stored in the black hole forever, and the information carry by these matter will always be stored in the black hole. Although the information in the black hole cannot be seen, we know that the information has not been lost. After considering the quantum effect, the black hole is no longer completely black. By considering quantum effect of black hole, Hawking shows that black holes emit thermal radiation like ordinary hot bodies. It is well known that there is no correlation between thermal radiation, therefore no information can be carried out by Hawking radiation.With the black hole evaporating, the information inside the black hole will gradually be lost. However, the unitary property of quantum mechanics indicates that information is conserved, therefore, the loss of black hole information conflicts with the unitary of quantum mechanics, this is the so-called mystery of black hole information loss. This problem reflects the conflict between gravitational theory and quantum theory, and attracts wide attention of scientists.Whether there is a correlation between Hawking radiation is the key to solving the problem of black hole information loss. Without considering the self-gravitating of the radiating particles in Hawking's initial calculations, he obtained the results of the pure thermal spectrum, so his result is inconsistent with energy conservation. Kraus and Wilczek show that the thermal spectrum may be corrected if the self-gravitating of the radiant particles is taken into account, thus Hawking radiations must be correlated, and their correlations can carry away information encoded within. This paper firstly introduced the black hole radiation non-thermal spectrum obtained by Parikh and Wilczek, who use the method of quantum tunneling after counting the self-gravitating of radiation particles; then it also introduced the research of Zhang et al., which proves that the entropy is conservation during black hole radiation process based on the non-thermal spectrum obtained by Parikh and Wilczek; and finally we proposed a possible physical mechanism for the correlation between black hole radiation, which shows that the gravitational correlation between the black hole radiation particles can carry information, so that the information is conserved during the black hole radiation process. The series of research on black hole information loss problem reveals that information conservation remains true when gravitational correlations among Hawking radiations are properly taken into account. Information conservation principle thus states Hawking radiation is unitary, which shows that the dynamics of a black hole obey the laws of quantum mechanics. Since a black hole is a result of general relativity, the unitarity of a black hole definitely indicates the possibility of a unified gravity and quantum mechanics.

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