Research ArticleModified Fermions Tunneling Radiation from Nonstationary,Axially Symmetric Kerr Black Hole
Jin Pu ,1,2 Kai Lin ,3 Xiao-Tao Zu ,1 and Shu-Zheng Yang 2
1School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China2College of Physics and Space Science, China West Normal University, Nanchong 637002, Sichuan, China3Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences,Wuhan 430074, Hubei, China
Correspondence should be addressed to Shu-Zheng Yang; [email protected]
Received 4 June 2019; Accepted 14 July 2019; Published 22 July 2019
Guest Editor: Saibal Ray
Copyright Β© 2019 Jin Pu et al. This is an open access article distributed under the Creative Commons Attribution License, whichpermits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this paper, by applying the deformeddispersion relation in quantumgravity theory,we study the correction of fermionsβ tunnelingradiation fromnonstationary symmetric black holes. Firstly, themotion equation of fermions ismodified in the gravitational space-time. Based on the motion equation, the modified Hamilton-Jacobi equation has been obtained by a semiclassical approximationmethod.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 ofHawking temperature and the tunnelingrate 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 ther-mally like a black body in 1974 [1, 2], a series of studieshave been carried out on static, stationary, and nonstationaryblack holes. Actually, Hawking thermal radiation is a purethermal radiation, and the radiation spectrum formed by thisradiation is a pure thermal radiation spectrum, which leadsto the problem of the information loss of black holes. In orderto explain the information loss paradox of black holes, Robin-son,Wilczek, Kraus, and Parikh havemodifiedHawking purethermal radiation spectrum and found that the informationwas conserved during Hawking tunneling radiation fromstatic and stationary black holes, by considering the self-gravitational interaction and the change of curved space-timebackground [3β8]. Subsequently, there are a series of studieson themassive particles and fermions via tunneling radiationfrom black holes [9β56]. However, the actual existence ofblack holes in the universe should be nonstationary, so theissues, such as the thermodynamic properties and the infor-mation conservation of nonstationary black holes, andmerg-ing process of black holes, deserve to be studied in depth.
On the other hand, quantum gravity theory suggests thatLorentz symmetrymay bemodified at high energy. Althoughthe dispersion relation theory at high energy has not yet beenfully established, it is generally accepted that the scale of thiscorrection term is equal to or close to the Planck scale. Wehave studied fermionsβ quantum tunneling radiation fromstationary black holes by using the deformed dispersion rela-tion and obtained the very interesting results that there was acorrection in the tunneling radiation behavior [57]. However,the correction is only obtained for fermionsβ tunneling radia-tion at the event horizon of stationary black holes. Therefore,we generalize the modified dispersion relation to study thequantum tunneling radiation of nonstationary symmetricKerr black holes in this paper and give an effective correctionof thermodynamic characteristics of the black holes.
The remainder of this paper is outlined as follows. InSection 2, by applying the modified dispersion relation inquantum gravity theory, we construct new Rarita-Schwingerequation and obtain the modified Hamilton-Jacobi equationof fermions by using semiclassical approximation method.In Section 3, the quantum tunneling radiation of fermionsfrom nonstationary symmetric Kerr black hole is modified
HindawiAdvances in High Energy PhysicsVolume 2019, Article ID 5864042, 7 pageshttps://doi.org/10.1155/2019/5864042
https://orcid.org/0000-0003-3553-8241https://orcid.org/0000-0001-9631-3586https://orcid.org/0000-0003-4050-8725https://orcid.org/0000-0003-2011-5430https://creativecommons.org/licenses/by/4.0/https://doi.org/10.1155/2019/5864042
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correctly, and the tunneling rate and Hawking temperatureare modified. Section 4 ends up with some discussions andconclusions.
2. The Modified Hamilton-Jacobi Equation
Kerner and Mann studied the quantum tunneling radiationof the Dirac field using a semiclassical method [20, 21].Subsequently, this method was extended to study quan-tum tunneling radiation in various black holes. Since thekinematic equation of fermions is the Dirac equation butthe Dirac equation is related to the matrix equation, so anew method is proposed in the literature [22β25] to studythe tunneling radiation of Dirac particles in curved space-time of static and stationary black holes. This method isthat the Dirac equation is transformed into a simple matrixequation, and then this matrix equation is converted intothe Hamilton-Jacobi equation in the curved space-time byapplying the relationship between the gamma matrix andthe space-time metric. After this Hamilton-Jacobi equationwas proposed in 2009, it not only promoted the study ofquantum tunneling radiation of dynamic black holes, butalso effectively simplified the research work on quantumtunneling radiation of fermions. Recently, this Hamilton-Jacobi equation, combined with the modified Lorentz dis-persion relation, has been generalized to effectively revisethe quantum tunneling radiation of fermions from the eventhorizon of stationary axisymmetric Kerr-Newman de Sitterblack hole and has obtained very meaningful results [57].However, it only modifies the quantum tunneling radiationof fermions from the stationary black hole, while the realblack holes existing in the universe are nonstationary, sothe quantum tunneling radiation of fermions from the eventhorizon of the dynamic Kerr black hole is modified in thispaper by considering the correction of dispersion relation.
The Lorentz dispersion relation is considered to be oneof the basic relations in modern physics and related to thecorrelative theory research of general relativity and quantumfield theory. Research on the quantum gravity theory hasshown that the Lorentz relationship may be modified in thehigh energy field. In the study of string theory and quantumgravity theory, a dispersion relation has been proposed [58β66]: π20 = βπ2 + π2 β (πΏπ0)πΌ βπ2. (1)In the natural units, π0 and π denote the energy andmomentum of particles, respectively. π is the rest mass ofparticles and πΏ is a constant of the Planck scale. πΌ = 1 isused in the Liouville-string model [62β64]. Kruglov got themodified Dirac equation in the case of πΌ = 2 [67]. Themore general motion equation of fermions was proposedby Rarita and Schwinger and called the Rarita-Schwingerequation [68]. According to (1), we select πΌ = 2, so the Rarita-Schwinger equation in flat space-time is given by(πΎπππ + πβ β πβπΎπ‘ππ‘πΎπππ)ππΌ1 β β β πΌπ = 0, (2)where πΎπ is the gamma matrix in flat space-time; π and πdenote space and time coordinates, respectively. According
to the relationship between the covariant derivative of thecurved space-time and the derivative of the flat space-time,the Rarita-Schwinger equation in the curved space-time ofnonstationary symmetric Kerr black hole can be expressed as(πΎππ·π + πβ β πβπΎvπ·vπΎππ·π)ππΌ1β β β πΌπ = 0, (3)where πΎπ is the gamma matrix in the curved space-time, andv denotes the advanced Eddington coordinate. In (3), whenπ = 0, we have ππΌ1β§πΌπ = π, in which case (3) represents theDirac equation of a spin of 1/2; when π = 1, (3) describesthe motion equation of the fermions with the spin of 3/2.However, when π = 0, the fermions with the spin of 3/2describe the Gravitino particle in the supersymmetry andsupergravity theory, which are a kind of fermions associatedwith the graviton, and the study on such particles is likely topromote the development of quantum gravity theory.
It is worth noting that (3) satisfies the following condi-tions: πΎππΎ] + πΎ]πΎπ = 2ππ]πΌ, (4)πΎππππΌ2β β β πΌπ = π·ππππΌ2 β β β πΌπ = ππππΌ3β β β πΌπ , (5)where πΌ is the unit matrix. In (3),π·π is defined asπ·π β‘ ππ + Ξ©π, (6)where Ξ©π is the spin connection. In (3), coupling constantπ βͺ 1, and πβπΎvπ·vπΎππ·π is very small quantity.
In order to study the tunneling radiation of fermionsin nonstationary curved space-time, π is used to representthe action function of particles, and the wave function offermions is written asππΌ1 β β β πΌπ = ππΌ1 β β β πΌππ(π/β)π. (7)For nonstationary and axisymmetric curved space-time,there must be πππ = π, (8)where π is the angular momentum parameter of particlesβtunneling radiation and a constant for nonstationary axisym-metric black holes. Substituting (6), (7), and (8) into (3), βis considered as a small quantity, and the lowest order isretained, so we obtainππΎππππππΌ1 β β β πΌπ + πππΌ1 β β β πΌπ + ππvππΎvπΎππππππΌ1 β β β πΌπ = 0. (9)Because of πΎππππ = πΎvπvπ + πΎππππ, (9) is abbreviated toΞππππππΌ1 β β β πΌπ +ππ·ππΌ1 β β β πΌπ = 0, (10)where Ξπ = πΎπ β πππvππΎvπΎπ,ππ· = π β π (πvπ)2 πvv. (11)We use premultiplication Ξ]π]π to (10) and getΞ]π]πΞππππππΌ1 β β β πΌπ +ππ·Ξ]π]πππΌ1 β β β πΌπ = 0, (12)where Ξ]Ξπ = πΎ]πΎπ β 2ππππ½ππΎπ½πΎ]πΎπ + O (π2) . (13)
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Now, after exchanging π and ] in (12) and comparing themwith (12), we get[πΎππΎ] + πΎ]πΎπ2 ππππ]π + π2 β 2πππvv (πvπ)2β 2πππvππvπ½ππ½ππΎππππ] ππΌ1 β β β πΌπ + O (π2)= [ππ]ππππ]π + π2 β 2πππvv (πvπ)2β 2πππvππvπ½ππ½ππΎππππ] ππΌ1 β β β πΌπ + O (π2) = 0.
(14)
Eq. (14) is further simplified toπππΎππππππΌ1 β β β πΌπ +ππππΌ1β β β πΌπ = 0, (15)where ππ = ππ]ππππ]π + π2 β 2πππvv (πvπ)22πvππvπ½ππ½π . (16)We use premultiplication βπππΎππππ for (15) and exchange πand ]. Then, we add it to (15) and divide that by 2, so we get[π2ππ]ππππ]π +π2π] ππΌ1β β β πΌπ = 0. (17)This is a matrix equation, actually an eigenmatrix equation.The condition that the equation has a nontrivial solution isthat the value of the determinant corresponding to its matrixis 0; that is, π2ππ]ππππ]π +π2π = 0. (18)Ignoring O(π2), the modified Hamilton-Jacobi equation canbe obtained from the above equation asππ]ππππ]π + π2 β 2πππvv (πvπ)2 = 0. (19)Obviously, modified Hamilton-Jacobi equation (19) isentirely different from the previously well-known Hamilton-Jacobi equation, with the addition of the modified term2πππvv(πvπ)2. Equation (19), derived from the modifiedRarita-Schwinger equation, is not affected by the specificspin and can describe themotion equation of any fermions inthe semiclassical approximation method. For any fermionsin nonstationary curved space-time, it is convenient to studyand modify characteristics of quantum tunneling radiationof fermions as long as the properties of the curved space-timeand the action π of fermions are known.3. Fermionsβ Tunneling Radiation inNonstationary Symmetric Kerr Black Hole
In the advanced Eddington coordinate, the line element ofnonstationary symmetric Kerr black hole is expressed asππ 2 = β(1 β 2πππ2 )ππ2 + 2πvππβ 22πππ sin2ππ2 πvππ β 2π sin2πππππ + π2ππ2
+ [(π2 + π2) + 2πππ2 sin2ππ2 ] sin2πππ2,(20)
where π2 = π2 + π2 cos2π,π = π(v), π = π(v). According to(20), the inverse tensors metric of the black hole is
ππ] = (π00 π01 0 π03π10 π11 0 π130 0 π22 0π30 π31 0 π33), (21)where π00 = π2 sin2ππ2 ,π01 = π10 = π2 + π2π2 ,π03 = π30 = ππ2 ,π13 = π31 = ππ2 ,π11 = Ξπ2 ,π22 = 1π2 ,π33 = 1π2 sin2π ,Ξ = π2 + π2 β 2ππ.
(22)
According to (20), the null hypersurface equation of the blackhole is given by ππ] ππππ₯π ππππ₯] = 0, (23)Substituting (22) into (23), the equation at the event horizonof the black hole is expressed asπ2π2π» sin2π + π2π» β 2πππ» + π2 + π2π» β 2 (π2π» + π2) Μππ»= 0, (24)From (24), we haveππ»= π + [π2 β (1 β 2 Μππ») (π2 + π2 Μππ» sin2π + π2π» β 2π2 Μππ»)]1/21 β 2 Μππ» . (25)Obviously, the event horizon of the black hole ππ» is associatedwith π(v), π(v), πvπ|π=ππ» = Μππ», and πππ|π=ππ» = ππ». Oncewe know the characteristics of the event horizon of the black
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hole, we can study the quantum tunneling radiation at theevent horizon.
The motion equation of fermions is given by matrixequation (3). From the above research, we can conclude thatthe motion equation of any half-integer fermions can bereduced to (19), and (19) is the modified Hamilton-Jacobiequation, where π is the main function of Hamilton, alsoknown as the action of fermions. Substituting (22) and (8)into (19), the motion equation of the half-integer fermions inspace-time of the black hole is obtained:π00 (πππv)2 + 2πππv ππππ + 2π03ππππv + 2π13πππππ+ π11 (ππππ)2 + π22 (ππππ)2 + π33π2 + π2β 2πππ00 (πππv)2 = 0.
(26)
Since the space-time of the black hole is axially symmetric,π is a constant according to π = ππ/ππ. Equation (26) isthe motion equation of fermions in nonstationary Kerr blackhole. Actually, (26) is amodifiedHamilton-Jacobi equation inthe nonstationary curved space-time, where π = π(v, π, π). Inorder to solve the equation,we need to use the general tortoisecoordinate transformation as follows:πβ = π + 12π [π β ππ» (v0, π0)] ,
vβ = v β v0,πβ = π β π0. (27)According to (27), we haveπππ = 2π (π β ππ») + ππ»2π (π β ππ») πππβ ,πππ = πππβ β ππ»ππ»2π (π β ππ») πππβ ,ππv = ππvβ β Μππ»ππ»2π (π β ππ») πππβ .
(28)
Substituting (27) and (28) into (26) and noticing
π = π (vβ, πβ, πβ) ,πππvβ = βπ,ππππβ = ππ,(29)
where π denotes the energy of fermionsβ tunneling radiation,ππ is π component of the generalizedmomentumof fermions,π is a small quantity, and π Μπ2 is also a small quantity, theequation at the horizon of the black hole can be written asπ΄π· ( ππππβ)2 + 2 πππvβ ππππβ + π΅π· πππβ + 2π (π β ππ») πΆπ·= 0 (30)whereπ΄ = 12π (π β ππ») {π00 Μππ» + 2 Μππ» [2π (π β ππ») + 1]+ π11 [2π (π β ππ») + 1]2 + π11 [2π (π β ππ») + 1]2+ π22π2π»} ,π΅ = π22ππππ» β π13π β π03π Μππ»,πΆ = π00π2 + π22π2π + π33π + π2 β 2πππ00π2,π· = π00 Μππ» β π01 + 2πππ00 Μππ».
(31)
When π β ππ», we haveπ΄( ππππβ)2 + 2 (π β π0) ππππβ = 0, (32)
where
π΄|πβππ» = limπβππ»vβv0πβπ0
π00 Μπ2π» β 2π01 Μππ» [2π (π β ππ») + 1] + π11 [2π (π β ππ») + 1]2 + π22π2π»2π (π β ππ») (π00 Μππ» β π01 + 2πππ00 Μππ») = 1. (33)From π΄|πβππ» = 1, we getπ0πβππ» = π03π Μππ» + π22ππ Μππ» β π13ππ00 Μππ» β π01 + 2πππ00 Μππ»= ππ Μππ» + ππ Μππ» β πππ2 sin2π Μππ» β π2π» β π2 + 2ππ Μππ»π2 sin2π
= ππ Μππ» + ππ Μππ» β πππ2 sin2π Μππ» β π2π» β π2 (1β 2ππ Μππ»π2 sin2ππ2 sin2π Μππ» β π2π» β π2 + O (π2)) .(34)
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So the event horizon surface gravity is given by
π = (1 β 2 Μππ») ππ» βππ2 sin2π0 Μππ» (1 + 2ππ) β (π2π» + π2) (1 β 2 Μππ») + 4πππ» β (π2π» + π2)= (1 β 2 Μππ») ππ» βππ2 sin2π0 Μππ» (1 + 2ππ) β (π2π» + π2) (1 β 2 Μππ») + 4πππ» (35)Wenotice π2π»(1β2 Μππ»)β2πππ»+π2(1β2 Μππ»+ Μπ2π» sin2π0)+π2π» = 0and getπ = (1 β 2 Μππ») ππ» βπ2πππ» β (1 β Μππ») Μππ»π2 sin2π0 + π2π» + 2πππ2 sin2π0= (1 β 2 Μππ») ππ» βπ(1 β 2 Μππ») [π2π» + π2 (1 β Μππ» sin2π0)] + π2π» + 2πππ2 sin2π0= (1 β 2 Μππ») ππ» βπ(1 β 2 Μππ») [π2π» + π2 (1 β Μππ» sin2π0)] + π2π» Γ {1β 2πππ2 sin2π0(1 β 2 Μππ») [π2π» + π2 (1 β Μππ» sin2π0)] + π2π» + O (π2)}
(36)
Obviously, the event horizon surface gravity is modified, andthemodified termdepends on π0. Itmeans that the correctionis made in different angle directions. Due to ππ/ππ = [1 +1/2π (π β ππ»)](ππ/ππβ), we haveπ = ππ2π [(π β π0) Β± (π β π0)] . (37)Thus, the imaginary part of the total action and the quantumtunneling rate, respectively, areπΌππ+ β πΌππβ = ππ2π [(π β π0) Β± (π β π0)] , (38)Ξ = Ξππππ π πππΞπππ ππ‘πππ = exp [2ππ (π β π0)] (39)Here, as shown in (36), it is clear that π mentioned above is theevent horizon surface gravity of the black hole. So, the eventhorizon temperature of the black hole is given byπ|π=ππ» = π 2π . (40)It is worth noting that the temperature (40) is the modifiedHawking temperature, since π in (40) is the modified surfacegravity related to the correction term 2πππ2sin2π0. Obvi-ously, the correction of tunneling rate, surface gravity, andHawking temperature at the event horizon of the black holeare related not only to the rates of the event horizon changeΜππ», ππ», andπ(v) of the black hole, but also to the correctionof the angle parameter π0.4. Discussion
In this paper, we study the quantum tunneling radiation offermions in nonstationary curved space-time by combining
the modified Lorentz dispersion relation and obtain themodified character of quantum tunneling radiation related tothe effects of the Planck scale. The modified Dirac equationproposed by Kruglov is first extended to the modifiedRarita-Schwinger equation for the more general fermions,and the modified Hamilton-Jacobi equation of fermions isobtained in the semiclassical approximation method. Then,we study the quantum tunneling radiation of fermions incurved space-time of nonstationary symmetric Kerr blackhole using themodifiedHamilton-Jacobi equation and obtainthe correction of Hawking temperature and tunneling rate offermions. Interestingly, we found that the modified Hawkingtemperature at the event horizon of the black hole dependsnot only on the rates of the event horizon change Μππ», ππ»,and π(v) of the black hole, but also on the correctionof the angle parameter π0. It means that the correction ofHawking radiation not only is the radial property of the blackhole, but also is related to the angular property of the blackhole.
In the study of quantum tunneling radiation of blackholes, people first modified Hawking pure thermal radiationand then modified character of tunneling radiation fromstationary black holes. With the research on quantum gravityeffect, we combine the deformed dispersion relation tomodify the tunneling radiation of nonstationary symmetricKerr black hole effectively. We believe that the correction oftunneling radiation from other types of curved space-timewill yield some interesting results. This paper only provides amethod to modify quantum tunneling radiation, and furtherresearch is needed.
Data Availability
This paper is a theoretical research that does not involve dataprocessing. 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 ScienceFoundation of China (GrantsNo. 11573022, No. 11805166) andby the starting funds of China West Normal University withGrants No. 17YC513 and No. 17C050.
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