Advances in High Energy Physics

Advances in High Energy Physics / 2019 / Article
Special Issue

Dark Matter and Dark Energy in General Relativity and Modified Theories of Gravity

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Research Article | Open Access

Volume 2019 |Article ID 5864042 | 7 pages | https://doi.org/10.1155/2019/5864042

Modified Fermions Tunneling Radiation from Nonstationary, Axially Symmetric Kerr Black Hole

Academic Editor: Saibal Ray
Received04 Jun 2019
Accepted14 Jul 2019
Published22 Jul 2019

Abstract

In this paper, by applying the deformed dispersion relation in quantum gravity theory, we study the correction of fermions’ tunneling radiation from nonstationary symmetric black holes. Firstly, the motion equation of fermions is modified in the gravitational space-time. Based on the motion equation, the modified Hamilton-Jacobi equation has been obtained by a semiclassical approximation method. Then, the tunneling behavior of fermions at the event horizon of nonstationary symmetric Kerr black hole is investigated. Finally, the results show that, in the nonstationary symmetric background, the correction of Hawking temperature and the tunneling rate are closely related to the angular parameters of the horizon of the black hole background.

1. Introduction

Since Hawking proposed that black holes can radiate thermally like a black body in 1974 [1, 2], a series of studies have been carried out on static, stationary, and nonstationary black holes. Actually, Hawking thermal radiation is a pure thermal radiation, and the radiation spectrum formed by this radiation is a pure thermal radiation spectrum, which leads to the problem of the information loss of black holes. In order to explain the information loss paradox of black holes, Robinson, Wilczek, Kraus, and Parikh have modified Hawking pure thermal radiation spectrum and found that the information was conserved during Hawking tunneling radiation from static and stationary black holes, by considering the self-gravitational interaction and the change of curved space-time background [38]. Subsequently, there are a series of studies on the massive particles and fermions via tunneling radiation from black holes [956]. However, the actual existence of black holes in the universe should be nonstationary, so the issues, such as the thermodynamic properties and the information conservation of nonstationary black holes, and merging process of black holes, deserve to be studied in depth.

On the other hand, quantum gravity theory suggests that Lorentz symmetry may be modified at high energy. Although the dispersion relation theory at high energy has not yet been fully established, it is generally accepted that the scale of this correction term is equal to or close to the Planck scale. We have studied fermions’ quantum tunneling radiation from stationary black holes by using the deformed dispersion relation and obtained the very interesting results that there was a correction in the tunneling radiation behavior [57]. However, the correction is only obtained for fermions’ tunneling radiation at the event horizon of stationary black holes. Therefore, we generalize the modified dispersion relation to study the quantum tunneling radiation of nonstationary symmetric Kerr black holes in this paper and give an effective correction of thermodynamic characteristics of the black holes.

The remainder of this paper is outlined as follows. In Section 2, by applying the modified dispersion relation in quantum gravity theory, we construct new Rarita-Schwinger equation and obtain the modified Hamilton-Jacobi equation of fermions by using semiclassical approximation method. In Section 3, the quantum tunneling radiation of fermions from nonstationary symmetric Kerr black hole is modified correctly, and the tunneling rate and Hawking temperature are modified. Section 4 ends up with some discussions and conclusions.

2. The Modified Hamilton-Jacobi Equation

Kerner and Mann studied the quantum tunneling radiation of the Dirac field using a semiclassical method [20, 21]. Subsequently, this method was extended to study quantum tunneling radiation in various black holes. Since the kinematic equation of fermions is the Dirac equation but the Dirac equation is related to the matrix equation, so a new method is proposed in the literature [2225] to study the tunneling radiation of Dirac particles in curved space-time of static and stationary black holes. This method is that the Dirac equation is transformed into a simple matrix equation, and then this matrix equation is converted into the Hamilton-Jacobi equation in the curved space-time by applying the relationship between the gamma matrix and the space-time metric. After this Hamilton-Jacobi equation was proposed in 2009, it not only promoted the study of quantum tunneling radiation of dynamic black holes, but also effectively simplified the research work on quantum tunneling radiation of fermions. Recently, this Hamilton-Jacobi equation, combined with the modified Lorentz dispersion relation, has been generalized to effectively revise the quantum tunneling radiation of fermions from the event horizon of stationary axisymmetric Kerr-Newman de Sitter black hole and has obtained very meaningful results [57]. However, it only modifies the quantum tunneling radiation of fermions from the stationary black hole, while the real black holes existing in the universe are nonstationary, so the quantum tunneling radiation of fermions from the event horizon of the dynamic Kerr black hole is modified in this paper by considering the correction of dispersion relation.

The Lorentz dispersion relation is considered to be one of the basic relations in modern physics and related to the correlative theory research of general relativity and quantum field theory. Research on the quantum gravity theory has shown that the Lorentz relationship may be modified in the high energy field. In the study of string theory and quantum gravity theory, a dispersion relation has been proposed [5866]:In the natural units, and denote the energy and momentum of particles, respectively. is the rest mass of particles and is a constant of the Planck scale. is used in the Liouville-string model [6264]. Kruglov got the modified Dirac equation in the case of [67]. The more general motion equation of fermions was proposed by Rarita and Schwinger and called the Rarita-Schwinger equation [68]. According to (1), we select , so the Rarita-Schwinger equation in flat space-time is given bywhere is the gamma matrix in flat space-time; and denote space and time coordinates, respectively. According to the relationship between the covariant derivative of the curved space-time and the derivative of the flat space-time, the Rarita-Schwinger equation in the curved space-time of nonstationary symmetric Kerr black hole can be expressed aswhere is the gamma matrix in the curved space-time, and denotes the advanced Eddington coordinate. In (3), when , we have , in which case (3) represents the Dirac equation of a spin of ; when , (3) describes the motion equation of the fermions with the spin of . However, when , the fermions with the spin of describe the Gravitino particle in the supersymmetry and supergravity theory, which are a kind of fermions associated with the graviton, and the study on such particles is likely to promote the development of quantum gravity theory.

It is worth noting that (3) satisfies the following conditions:where is the unit matrix. In (3), is defined aswhere is the spin connection. In (3), coupling constant , and is very small quantity.

In order to study the tunneling radiation of fermions in nonstationary curved space-time, is used to represent the action function of particles, and the wave function of fermions is written asFor nonstationary and axisymmetric curved space-time, there must bewhere is the angular momentum parameter of particles’ tunneling radiation and a constant for nonstationary axisymmetric black holes. Substituting (6), (7), and (8) into (3), is considered as a small quantity, and the lowest order is retained, so we obtainBecause of , (9) is abbreviated towhereWe use premultiplication to (10) and getwhereNow, after exchanging and in (12) and comparing them with (12), we getEq. (14) is further simplified towhereWe use premultiplication for (15) and exchange and . Then, we add it to (15) and divide that by , so we getThis is a matrix equation, actually an eigenmatrix equation. The condition that the equation has a nontrivial solution is that the value of the determinant corresponding to its matrix is ; that is,Ignoring , the modified Hamilton-Jacobi equation can be obtained from the above equation asObviously, modified Hamilton-Jacobi equation (19) is entirely different from the previously well-known Hamilton-Jacobi equation, with the addition of the modified term . Equation (19), derived from the modified Rarita-Schwinger equation, is not affected by the specific spin and can describe the motion equation of any fermions in the semiclassical approximation method. For any fermions in nonstationary curved space-time, it is convenient to study and modify characteristics of quantum tunneling radiation of fermions as long as the properties of the curved space-time and the action of fermions are known.

3. Fermions’ Tunneling Radiation in Nonstationary Symmetric Kerr Black Hole

In the advanced Eddington coordinate, the line element of nonstationary symmetric Kerr black hole is expressed aswhere , , . According to (20), the inverse tensors metric of the black hole iswhereAccording to (20), the null hypersurface equation of the black hole is given bySubstituting (22) into (23), the equation at the event horizon of the black hole is expressed asFrom (24), we haveObviously, the event horizon of the black hole is associated with , , , and . Once we know the characteristics of the event horizon of the black hole, we can study the quantum tunneling radiation at the event horizon.

The motion equation of fermions is given by matrix equation (3). From the above research, we can conclude that the motion equation of any half-integer fermions can be reduced to (19), and (19) is the modified Hamilton-Jacobi equation, where is the main function of Hamilton, also known as the action of fermions. Substituting (22) and (8) into (19), the motion equation of the half-integer fermions in space-time of the black hole is obtained:Since the space-time of the black hole is axially symmetric, is a constant according to . Equation (26) is the motion equation of fermions in nonstationary Kerr black hole. Actually, (26) is a modified Hamilton-Jacobi equation in the nonstationary curved space-time, where . In order to solve the equation, we need to use the general tortoise coordinate transformation as follows:According to (27), we haveSubstituting (27) and (28) into (26) and noticingwhere denotes the energy of fermions’ tunneling radiation, is component of the generalized momentum of fermions, is a small quantity, and is also a small quantity, the equation at the horizon of the black hole can be written aswhereWhen , we havewhereFrom , we getSo the event horizon surface gravity is given byWe notice and getObviously, the event horizon surface gravity is modified, and the modified term depends on . It means that the correction is made in different angle directions. Due to , we haveThus, the imaginary part of the total action and the quantum tunneling rate, respectively, areHere, as shown in (36), it is clear that mentioned above is the event horizon surface gravity of the black hole. So, the event horizon temperature of the black hole is given byIt is worth noting that the temperature (40) is the modified Hawking temperature, since in (40) is the modified surface gravity related to the correction term . Obviously, the correction of tunneling rate, surface gravity, and Hawking temperature at the event horizon of the black hole are related not only to the rates of the event horizon change , , and of the black hole, but also to the correction of the angle parameter .

4. Discussion

In this paper, we study the quantum tunneling radiation of fermions in nonstationary curved space-time by combining the modified Lorentz dispersion relation and obtain the modified character of quantum tunneling radiation related to the effects of the Planck scale. The modified Dirac equation proposed by Kruglov is first extended to the modified Rarita-Schwinger equation for the more general fermions, and the modified Hamilton-Jacobi equation of fermions is obtained in the semiclassical approximation method. Then, we study the quantum tunneling radiation of fermions in curved space-time of nonstationary symmetric Kerr black hole using the modified Hamilton-Jacobi equation and obtain the correction of Hawking temperature and tunneling rate of fermions. Interestingly, we found that the modified Hawking temperature at the event horizon of the black hole depends not only on the rates of the event horizon change , , and of the black hole, but also on the correction of the angle parameter . It means that the correction of Hawking radiation not only is the radial property of the black hole, but also is related to the angular property of the black hole.

In the study of quantum tunneling radiation of black holes, people first modified Hawking pure thermal radiation and then modified character of tunneling radiation from stationary black holes. With the research on quantum gravity effect, we combine the deformed dispersion relation to modify the tunneling radiation of nonstationary symmetric Kerr black hole effectively. We believe that the correction of tunneling radiation from other types of curved space-time will yield some interesting results. This paper only provides a method to modify quantum tunneling radiation, and further research is needed.

Data Availability

This paper is a theoretical research that does not involve data processing. No data were used to support this study.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grants No. 11573022, No. 11805166) and by the starting funds of China West Normal University with Grants No. 17YC513 and No. 17C050.

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