Research Article | Open Access
Ali Övgün, "The Bekenstein-Hawking Corpuscular Cascading from the Back-Reacted Black Hole", Advances in High Energy Physics, vol. 2017, Article ID 1573904, 9 pages, 2017. https://doi.org/10.1155/2017/1573904
The Bekenstein-Hawking Corpuscular Cascading from the Back-Reacted Black Hole
Exciting peculiarities of Planck-scale physics have immediate effects on the Bekenstein-Hawking radiation emitted from black holes (BHs). In this paper, using the tunneling formalism, we determine the Bekenstein-Hawking temperature for the vector particles from a back-reacted black hole (BBH) constructed from a conformal scalar field surrounded by a BTZ (Banados-Teitelboim-Zanelli) BH. Then, under the effect of the generalized uncertainty principle, we extend our calculations for scalar particles to understand the effects of quantum gravity. Then, we calculate an evaporation time for the BBH, the total number of Bekenstein-Hawking particles, and the quantum corrections of the number. We observe that remnants of the BH evaporation occur and that they affect the Bekenstein-Hawking temperature of the BBH as well as the total number of Bekenstein-Hawking particles.
Many years ago, Bekenstein suggested that, in a quantum theory of gravity, the surface area of a black hole (BH) should have a discrete spectrum . In 1972, Bekenstein wrote a seminal paper showing that the entropy of a BH is exactly proportional to the size of its event horizon; then, he showed that there is a maximum amount of information that can be stored in a finite region of space, a concept known as the Bekenstein bound [2, 3]. Following Bekenstein’s insights, some of the most significant ideas in theoretical physics were born, such as Bekenstein-Hawking radiation [2–5], the BH information paradox, the holographic principle, and the BH firewall paradox. It is a remarkable fact that, according to the seminal works of Bekenstein and then Hawking [2–5], BHs are not entirely black. That surprising claim was made over forty years ago. Examining the behavior of quantum fluctuations around the event horizon of a BH, Bekenstein and Hawking substantiated the theory that BHs emit thermal radiation with a constant temperature (the so-called Bekenstein-Hawking temperature) that is directly proportional to the surface gravity , which is the gravitational acceleration experienced at the BH’s horizon [2, 3, 5]: When BHs evaporate, their temperatures increase adiabatically as a function of their remaining mass. Quantum fluctuations create a virtual particle pair near the BH horizon. While the particle with negative energy tunnels into the horizon (absorption), the other having positive energy flies off into spatial infinity (emission) and produces Bekenstein-Hawking radiation (BHR). There are various methods for calculating the level of BHR, and the two most popular tunneling methods are the null geodesic method and the Hamilton-Jacobi (HJ) method [6–39]. Both approaches use the tunneling method by applying the WKB (Wentzel-Kramers-Brillouin) approximation and finding the emission and absorption probabilities of the tunneling particles, which give the tunneling rate as follows [40–51]: where is the action of the classically forbidden trajectory of the tunneling particle, which has an energy and a temperature . Here, the conservation of energy plays an important role. First, there is a transition between states with the same total energy; then, it radiates when the mass of the residual hole must go down. Also, there is a way to lower the mass of the BH. This brings us to the idea that BHs are thought to be excited states in quantum gravity, so that one can derive the BH temperature, which is related to the Boltzmann factor, using the imaginary part of the action during the process of the emission of an s-wave from the inside to the outside of the horizon [6–11]. For calculations of the tunneling probability, it is simple to use a WKB approximation. It should be noted that one can ignore the higher-order terms (and use only a linear-order expansion), which have a self-interaction effect that results from the conservation of energy [18–21]. One of the methods for finding is the HJ method. This method is generally employed by substituting a suitable ansatz, with consideration of the symmetries of the space-time, into the relativistic HJ equation [23, 24, 38–40, 52, 53]. The resulting radial integral always possesses a pole located at the event horizon. However, using the residue theory, the associated pole can be analytically avoided. It is argued that BHs emit radiation that is dissimilar to emitted radiation from a thermal objects except that the BH radiation spectrum is semiclassically sparse. At least in the weak regime, a quantum BH retains a discrete profile that may result from the simplicity of the spectrum. Different complicated spectra can be obtained, and they cause the radiation to look continuous enough in profile to use different quantum theories . Furthermore, from the emission spectrum of the BH radiation, if the grey body factor is ignored, semiclassical treatment shows that BHs radiate and that the resulting emission spectrum is similar to that of the thermal radiation of a blackbody. Reference  showed that there is a very long time gap between the emissions; moreover, the same conclusion that the cascade of BHR is very sparse was also shown. For an observer at the asymptotic infinity, the flux of BHR from a BH is intensely sparse , especially for a Schwarzschild BH. However, for dimensional cases that are lower/higher than dimensions, Bekenstein-Hawking cascades have a continuous character [1, 57–60].
The collapsed pure initial state supports the formation of a BH, which was concluded by Hawking, and then the radiation shades into a high-entropy mixed state. This is contrary to the fundamentals of quantum mechanics which cannot maintain its pure state, so it becomes mixed up and causes an information paradox . Here, we use a back-reacted black hole (BBH), which is a BTZ (Banados-Teitelboim-Zanelli) BH surrounded by a conformal scalar field [54, 61–64], to investigate the BHR from tunneling vector particles and quantum gravity-affected scalar particles. Our motivation for working on dimensions is to make the problem much easier. First, there are no propagating degrees of freedom. Quantum gravity in dimensions is renormalizable and finite. It is also well known that the findings in dimensions are a good guide to what would happen in the real world. We will now find out what happens to the Bekenstein-Hawking temperature of scalar and vector particles from a BBH.
This paper is organized as follows. In Section 2, we introduce the geometric and thermodynamic features of BBH space-time. In Section 3, we study the Proca equation to find a massive boson in this geometry. Then, we employ the HJ method with the separation of variables technique to obtain the BHR level of the BBH. Then, in Section 4, we repeat the calculations for the radiating scalar particles under the effect of quantum gravity. We compute the corrected Bekenstein-Hawking temperature. Finally, in Section 5, we obtain the total number of outgoing Bekenstein-Hawking particles, and the paper ends with our conclusions in Section 6.
2. Back-Reacted Black Hole
The BBH is constructed from a BTZ BH surrounded by a conformal scalar field. For this reason, one calculates the stress-energy tensor by considering the transparent boundary conditions at infinity; the approximate solution coincides, on a finite domain, with the exact solution [54, 62, 63]. Transparent boundary conditions, whose name comes from the fact that they are designed to be transparent to outgoing perturbations, have the attribute of being nonreflecting. Transparent boundary conditions were originally designed for the Schrodinger equations but have also been applied to the wave equation  and the conformal scalar field [54, 62, 63]. The semiclassical equations are used to find the correction to the BBH geometry. The exact solution of the metric of the BBH in the presence of a conformally coupled scalar field in three dimensions can be expressed as : where It is noted that is the cosmological constant, is the mass of the BBH, and is the length of the Planck. Note that for transparent boundary conditions is defined as follows : where is an arbitrary phase. For a field with periodic boundary conditions (bosons), while for fields with antiperiodic boundary conditions (fermions).
The BTZ BH is recovered at for . Furthermore, the metric has an event horizon which is located at
Since the perturbative expansion has no corrections from graviton loops, only radiative corrections are obtained from quantum excitations of the matter fields, because the quantum gravity in dimensions is renormalizable and finite. Furthermore, it is observed that the temperature is linear in . The corrections are removed when the for a large , so the back-reaction is more dominant for small masses than for the Planck mass. The other important point is that , which depends on the ratio , causes corrections so that, for a small cosmological constant, we can ignore the perturbation of the geometry produced by radiation fields.
3. Bekenstein-Hawking Radiation of Vector Particles from BBH
To calculate the BHR of the tunneling vector particles from the BBH, the Proca equation is used on the BBH geometry. The massive vector particles are described by the Proca equation with the wave function given by [22–27] in whichTo leading order in the energy we can neglect the effects of the self-gravitation of the particle . Then we solve the Proca equation on the background of the BBH, It is assumed that the solution exists in the form of the vector functions: where are some arbitrary constants, with the help of action
Then the above equations becomeUsing the WKB approximation, the action can be chosen at the leading order in as Here the energy is defined by and the angular momentum of the spin-1 vector particles is defined by ; furthermore is a constant. Then we use (14) inside the solutions of (13) considering the leading order in . Then matrix (let us say matrix) is obtained: . It is noted that the superscript means the transition to the transposed vector. So, the nonzero components of the matrix of are calculated as follows:
The condition of the finding nontrivial solutions of any linear equations () gives
Then the solution of the above equation for the radial function yieldsIt is noted that and show that the vector particles move away from the BBH and move towards to the BBH. Moreover, there are poles located at horizon ; the imaginary part of can be calculated by using the complex path integration method [27, 34, 35]. Then, the integral becomes
Then we obtain the probabilities of the vector particles tunnels through the horizon out/in:
The ingoing vector particles must have the which mean that their chance to fall inside is 100% in agreement with the definition of the BH [26, 27, 34]. Consequently, we can choose the ; then it becomes and we can calculate the tunneling rate of the vector particles asNote that the Bekenstein-Hawking temperature of the BBH is recovered by using relation between the tunneling rate and the Boltzmann factor . Hence, the Bekenstein-Hawking temperature of BBH is [54, 62, 63] Hence, we obtain the correct Bekenstein-Hawking temperature of the BBH using the tunneling method for the spin-1 particles.
4. Bekenstein-Hawking Radiation of Scalar Particles from BBH with the Effect of the Quantum Gravity
In this section, we check the effects of quantum gravity on the BHR of scalar particles from a BBH using the generalized uncertainty principle (GUP). One may ask how we can extend the quantum mechanics, considering the gravitational interactions. The answer is a quantum theory of gravity, which is the biggest problem in theoretical physics. One common feature among various quantum gravity theories, such as string theory, loop quantum gravity, and noncommutative geometry, is the existence of a minimum measurable length [66–74]. An effective model for realizing the minimum length is the GUP, based on which the first generalized uncertainty relationship was proposed by , to solve the problem of quantum gravity.
First, we solve the Klein-Gordon (KG) equation under the effect of the GUP on the background of the BBH to find the BHR. The commutation relationship is modified by using quantum gravity as follows [45, 67–69]: and the GUP is derived as follows: It is noted that is a small value, is the Planck mass, is the Planck length ( m), and is a dimensionless parameter.
Quantum gravity effects the KG equation which is the relativistic wave equation for the scalar particles, because the position, momentum, and energy operators are modified due to the GUP, respectively, as follows:Furthermore, the frequency is also generalized aswith the energy operator . One can calculate the square of momentum operators up to order as where, in the last step, we only keep the leading order term of .
Therefore, the generalized KG equation with the wave function can be written as  Herein, we substitute the ansatz for the semiclassical wave function of the scalar particles where is the constant, into the generalized KG equation (27) with the BBH metric (4) which is the background of scalar particle motion. Then, the differential equation for the action is calculated as follows:The separation of variables is used to solve the generalized KG equation after (29) is expanded into the lowest order of where is the constant. Then we substitute (30) into (29) to solve for the . Then the radial part of the scalar wave function is found thatwhere the positive and negative signatures are for the outgoing and ingoing scalar particles. To solve this integral, after using the residue method around the pole at the horizon, we obtain the solution Herein, similarly to the previous section, we use the fact of the probability of ingoing particles to 100%. Thus, the tunneling rate is calculated for the scalar particles with the effect of the quantum gravity asNow, it is easy to recover Bekenstein-Hawking temperature for the scalar particles with the effect of quantum gravity
It is easily observed that when we choose , it is equal to the original result of Bekenstein-Hawking temperature. Hence, the BHR of the BBH with the effect of the quantum gravity has remnants.
5. Total Number of Tunneling Massless Bekenstein-Hawking Particles
In this section, we calculate the estimation of the total number of massless quanta emitted by the BBH. One shows that the total number of quanta emitted by the BBH is proportional to the square of the BBH’s initial mass in Planck units. Firstly we introduce Planck’s law of black body radiation for two space dimensions to calculate the spectral luminosity density of an ideal black body as follows () [75–77]: Note that , , and are the energy, surface area, and the temperature, respectively. The result of the integration of (35) is the Stefan-Boltzmann law which is stated that the power emitted per unit area of the surface of a black hole is directly proportional to the 4th power of its temperature [75, 76]. After we take integral of (35), for two space dimensions, the luminosity is found as Then the emission rate of the emitted quanta is obtained as where is the number of radiating degrees of freedom, Now, we recall the Bekenstein-Hawking temperature of the BBH and the area of the BBH in dimension as One shows that the mass loss rate is related to the luminosity as follows: Then the evaporation time of the BTZ BH is obtained asAfter that we calculate the emission rate of the Bekenstein-Hawking particles The total number of the outgoing Bekenstein-Hawking particles is obtained by following relation [75, 76]: and it is found as Note that it does not depend on the spin of the particles so both vector and scalar particles radiate from BBH with the same number of particles [75, 76].
For the case of scalar particles with the effect of quantum gravity, the total number of the outgoing Bekenstein-Hawking particles is
The total number of Bekenstein-Hawking particles () increases with the effect of the quantum gravity constant . However, at some point, becomes zero, and no particles are emitted. The results of the calculation of the total number of tunneling massless Bekenstein-Hawking particles are compatible with recent studies on the information paradox . Also, one can calculate the number of gravitons in the BH quantum portrait with similar conclusions [56, 78, 79]. In this paper, we follow the same proposal as , but we investigate it differently for dimensions, imagining a BH to be a Bose-Einstein condensate with very large and massive gravitons. To solve the information paradox, BHR is thought of as resulting from a decrease in the condensate with nonthermal properties of order when a two-body interaction occurs and also gives evidence of a quantum portrait of a semiclassical BH [78, 79]. One can interpret each Bekenstein-Hawking radiated particle as an information storage unit; in fact, there is an expected link between the entropy and the particle number, so that the BHR can be thought of as sparse in a semiclassical (corpuscular) regime.
In this paper, first by using the generalized Klein-Gordon and Proca equations, we investigate the scalar/vector particles tunneling from a BBH and recover the corresponding Bekenstein-Hawking temperatures. For this purpose, first we use the Proca equation for the tunneling spin-1 (vector) particles on the background of BBH space-time. Using the WKB approximation to the Proca equation, we find the set of field equations. Then we use the Hamilton-Jacobi ansatz to solve these equations. To solve these equations, we take the determinant of coefficient matrix as zero and we expand the functions in Taylor’s series near horizon to find the radial wave equation using the complex path integral. Then we use the surface gravity and calculate the probability of tunneling of spin-1 particles from the BBH. Using the Boltzmann formula, we derive the corresponding Bekenstein-Hawking temperature. It is worthwhile to mention here that the self- gravitating effects have been neglected; however there are back-reaction effects because of the BBH geometry. Moreover, we calculate the Bekenstein-Hawking temperature only in a leading order term. Hence, we can conclude that Bekenstein-Hawking temperature is not dependent on the types of particles and also the tunneling probabilities are same. Therefore, their corresponding Bekenstein-Hawking temperatures are the same for all kinds of particles.
Second, we use the effect of GUP that the existence of a minimal length leads to the modification of the Heisenberg uncertainty principle on the tunneling scalar particles. The GUP contains an additional quadratic term in momentum in addition to a minimal length. After we generalize the Klein-Gordon equation using the effect of the GUP, we focus on the Hamilton-Jacobi method to determine the tunneling probability of the scalar particles. Again we use the WKB approximation and Hamilton-Jacobi ansatz in the tunneling formalism and calculate the imaginary part of the action in order to obtain the Bekenstein-Hawking temperature. Hence, it is shown that if the GUP is used, then the Bekenstein-Hawking temperature of the tunneling scalar particle at the event horizon differs from the original case and the Bekenstein-Hawking temperature has a nonthermal feature. The back-reactions on the black hole have also similar nonthermal effects on the Bekenstein-Hawking temperature. It is concluded that using the GUP decreases the back-reacted effects on the Bekenstein-Hawking temperature. However, the GUP effects are not sufficient to extinguish the Bekenstein-Hawking temperature.
Scalar and vector particles radiate from a BBH with equivalent energies if the GUP is not used. After one uses the generalized Klein-Gordon equation with the effect of GUP, the corrected temperature decreases with the effects of quantum gravity, and at some point, remnants are left. Then, we calculate the total number of emitted Bekenstein-Hawking particles from the special case of a BBH, which is a BTZ BH. Also, we check the effects of quantum gravity on the total number of emitted particles from the BH. It is shown that the emitted Bekenstein-Hawking particles are information-carrying units. This indicates a corpuscular interpretation instead of an undulatory one, and when the BH collapses, its unitary property is preserved, and the BH evaporates. Hence, the effect of quantum gravity balances the classical tendency of rising temperature, and there exist remnants. In summary, it is very rare for the BHR to be extremely diluted. The BHR particles are discrete during propagation and also appear as particles later on so that the BHR particles appear to be a particle feature.
Conflicts of Interest
The author declares that there are no conflicts of interest regarding the publication of this paper.
This work was supported by the Chilean FONDECYT Grant no. 3170035.
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Copyright © 2017 Ali Övgün. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.