Research Article | Open Access

Sourav Haldar, Christian Corda, Subenoy Chakraborty, "Tunnelling Mechanism in Noncommutative Space with Generalized Uncertainty Principle and Bohr-Like Black Hole", *Advances in High Energy Physics*, vol. 2018, Article ID 9851598, 9 pages, 2018. https://doi.org/10.1155/2018/9851598

# Tunnelling Mechanism in Noncommutative Space with Generalized Uncertainty Principle and Bohr-Like Black Hole

**Academic Editor:**Ozay Gurtug

#### Abstract

The paper deals with nonthermal radiation spectrum by tunnelling mechanism with correction due to the generalized uncertainty principle (GUP) in the background of noncommutative geometry. Considering the reformulation of the tunnelling mechanism by Banerjee and Majhi, the Hawking radiation spectrum is evaluated through the density matrix for the outgoing modes. The GUP corrected effective temperature and the corresponding GUP corrected effective metric in noncommutative geometry are determined using Hawking’s periodicity arguments. Thus, we obtain further corrections to the nonstrictly thermal black hole (BH) radiation spectrum which give new final distributions. Then, we show that the GUP and the noncommutative geometry modify the Bohr-like BH recently discussed in a series of papers in the literature. In particular, we find the intriguing result that the famous law of Bekenstein on the area quantization is affected neither by noncommutative geometry nor by the GUP. This is a clear indication of the universality of Bekenstein’s result. In addition, we find that both the Bekenstein-Hawking entropy and the total BH entropy to third-order approximation are still functions of the BH quantum level.

#### 1. Introduction

Hawking radiation [1] in the tunnelling mechanism [2–11] is an elegant way to approach the particle creation caused by the vacuum fluctuations near the BH horizon. The virtual particle pair can be created either just inside the horizon or just outside the horizon. For both the possibilities, the negative energy particle is absorbed by the BH, resulting in a loss of the mass of the BH, and the positive energy particle moves toward infinity, causing the subsequent emission of Hawking radiation. Considering contributions beyond the semiclassical approximation in the tunnelling process, Parikh and Wilczek [2, 3] formulated the nonthermal spectrum of the radiation from BH which leads to interesting approaches [12, 13] to resolve the information loss paradox of BH evaporation [14]. Also, subsequently, by a novel formulation of the tunnelling formalism, Banerjee and Majhi [7] directly derived the black body spectrum for both bosons and fermions from a BH with standard Hawking temperature. The analysis in [7] was improved by one of us, Christian Corda [15], who found as final result a nonstrictly black body spectrum in agreement with the emission probability in [2, 3]. This nonthermal spectrum is deeply interrelated to the underlying quantum gravity theory. As a result, the particle emission can be interpreted as a quantum transition of frequency between two discrete states [13, 16, 17]. Thus, the particle itself generates a tunnel through the BH horizon [3, 15–17] having finite size. This solves a problem of the thermal approximation; namely, in that case, the tunnelling points have zero separation and hence there is no clear trajectory as there is no barrier [3, 15–17]. Other aspects of tunnelling mechanism have been discussed in [18, 19].

In this paper, we analyse the corrections to the nonthermal spectrum of Parikh and Wilczek due to the noncommutative geometry and the GUP. It is shown that such corrections modify the Bohr-like BH recently discussed in a series of papers in the literature [13, 20–24]. An important result will be that the famous law of Bekenstein on the area quantization [25] is affected neither by noncommutative geometry nor by the GUP. We can consider this as a clear indication of the universality of Bekenstein’s result. We also find that both the Bekenstein-Hawking entropy and the total BH entropy to third-order approximation are still functions of the BH quantum level.

The physical reasons that motivate this work are two. On one hand, the background of noncommutative geometry is important because it can cure, in principle, some of the usual problems encountered in the description of the terminal phase of BH evaporation [26]. On the other hand, the GUP suggests a fundamental and discrete granular structure of space with important implications in quantum gravity [27–29]. For the sake of completeness, we take the chance to signal some recent important approach where GUP importance in BH physics is emphasized [30–35].

#### 2. Basic Equations for Noncommutative Space

In noncommutative space, the usual definition of mass density in the form of Dirac delta function does not hold due to position-position uncertainty relation. A particle mass, instead of being exactly localized at the point, is diffused in a region of linear size . The intrinsic uncertainty can be expressed as the coordinate commutator: , where the antisymmetric matrix characterizes the fundamental cell discretization of space-time, analogous to the discretization of the phase-space by the Planck constant . It should be noted that the effect of noncommutativity is not visible at presently accessible energies; that is, cm. In particular, one should take into account the noncommutativity effect at distance . As a result, there will be density of energy and momentum. Thus, in noncommutative geometry, the mass density is described by a Gaussian distribution of minimal width as (we work in Planck units, i.e., in the following) [26, 36, 37]Here the noncommutative parameter is a small ( unity in Planck units) positive number. Hence the mass of the analogous Schwarzschild BH is given by [37]where the (lower) incomplete gamma function is defined as [37]Thus, in the limit , that is, , we have the usual gamma function and commutative geometry is recovered. Hence, the usual Schwarzschild metric, that is [15],takes the noncommutative form as [37]Note that line element (5) can also be obtained as the solution of the Einstein field equations with (2) being the matter content. Thus, the event horizon can be obtained by solving aswhich clearly shows that cannot be solved in closed form.

For the sake of completeness, we stress that noncommutative corrections to different thermodynamical quantities have been discussed in [38].

#### 3. Tunnelling Approach to Radiation Spectrum: GUP Corrections

In strictly thermal approach, the probability of emission of Hawking quanta is [1]where is the energy frequency of the emitted radiation and is the usual Hawking temperature. This probability of emission has been modified by Parikh and Wilezek in the tunnelling framework, considering contributions beyond the semiclassical approximation as [2, 3]with . For the sake of completeness, we stress that, in [39], nonthermal corrections to the Hawking effect were discussed through a different approach. In that case, the structure of is retained as , where is given by [39]The nonleading terms are the corrections to the temperature due to quantum effects and (see [39] for details).

Now, comparing the above two probabilities in (7) and (8), one can introduce the notion of the effective BH temperature as [13, 15–17]Analogously, one can define the effective mass and effective horizon radius as [13, 15–17]Further, these effective quantities can be interpreted as average values of the corresponding quantities before (i.e., initial) and after (i.e., final) the particle emission [13, 15–17]. Accordingly, the effective temperature is the inverse of the average value of the inverses of the initial and final Hawking temperatures [13, 15–17]. As a result, the effective Schwarzschild line element is [15]One can describe this line element as the BH dynamical geometry during the emission of the particle. Further, proceeding along the line of approach of one of us (Christian Corda) [15], the final nonstrictly thermal distributions considering the BH dynamical geometry take the form [15]where the suffices and represent boson and fermion particles, respectively. This tunnelling approach has been recently finalized in [20].

On the other hand, by taking into account the noncommutative geometry discussed in Section 1 of this paper, starting from the noncommutative form of the Schwarzschild metric (5), the equations from (7) to (13) must be replaced by their noncommutative counterparts aswhere is the Hawking temperature in the noncommutative geometry:Now, let us consider the modified Hawking temperature due to GUP corrections [27, 28]. It can be expressed as [27, 28]As a consequence, we can introduce* a GUP modified BH mass and a GUP modified horizon radius* as [27, 28]respectively. Thus, (16) readsUsing Hawking’s periodicity argument [15, 27, 39–41], one obtains the modified GUP Schwarzschild-like line element [27]:and [27]as the* GUP modified surface gravity*. The modified Schwarzschild solution (19) is obtained using the GUP in the background of noncommutative geometry. Thus, it is clear that the GUP Schwarzschild solution is not a solution of the Einstein field equation. It will be interesting to find modification of Einstein gravity for which the GUP Schwarzschild solution is a solution. This could be the subject of future works.

Now, combining this GUP correction with the notion of effective temperature, one can introduce the* GUP corrected effective temperature* as [27]the* GUP corrected effective Boltzmann factor* as [27]and the* GUP corrected effective mass and effective horizon radius* as [27]Note that the equations from (16) to (20) represent GUP corrections using Hamilton-Jacobi method beyond the semiclassical approximation. By taking into account the noncommutative geometry, the equations from (16) to (23) becomeFurther, by Hawking’s periodicity argument [15, 27, 40, 41], one easily obtains the modified GUP noncommutative effective Schwarzschild-like line element asNow, if one follows step by step the analysis in [15, 27], then at the end one obtains the correct physical states for boson and fermions asand the correct distributions aswhich, by using the first of (25), becomeThe above expressions of the distributions clearly show that they are not thermal in nature as the BH dynamical geometry during the emission of the particle, the GUP corrections to the semiclassical Hawking temperature, and the noncommutative geometry are taken into account.

#### 4. Corrections to the Bohr-Like Black Hole

The general conviction that BHs should be highly excited states representing the fundamental bricks of quantum gravity [42] has been shown to be correct in the recent works [13, 20–24]. In such papers, one of us (Christian Corda) has indeed shown that the Schwarzschild BH is the gravitational analogy of the historical semiclassical Bohr’s hydrogen atom [43, 44]. The Bohr-like approach to BH quantum physics started with the pioneering works [16, 17]. It works through the natural correspondence between Hawking radiation and BH quasi-normal modes (QNMs) [13, 20–24]. Considering an isolated BH (in the same way that Bohr considered an isolated hydrogen atom), the emissions of Hawking quanta and the absorptions of external particles “trigger” the BH QNMs [13, 20–24]. In this analogy, BH QNMs represent the “electron” jumping from a quantum level to another one. Hence, their absolute values are the energy “shells” of the “gravitational hydrogen atom” [13, 20–24]. Remarkably, the time evolution of the system permits to solve the BH information puzzle [13, 22]. The results in [13, 20–24] are also consistent with previous results in the literature, including the historic result of Bekenstein on the area quantization [25]. The Bohr-like framework for BH quantum physics also finalizes the famous tunnelling approach of Parikh and Wilczek. One indeed finds the correct value of the prefactor of the Parikh and Wilczek probability of emission, that is, in (8), as [20]In this equation, represents the maximum value of the principal quantum number which can be found in (17) in [20], while is the BH excited level. Thus, depends on the BH quantum level (see [20] for details). This result permits to write down the probability of emission between two generic BH quantum levels and in the intriguing form [20]: In a quantum mechanical framework, Hawking radiation can be physically interpreted in terms of quantum jumps among unperturbed levels [13, 16, 17, 20–24].

For large values of , that is, for excited BHs, the QNMs’ expression of the Schwarzschild BH is independent of the angular momentum quantum number [13, 16, 17, 20–24]. In order to take into account the nonstrict thermality of the radiation spectrum, one replaces the Hawking temperature with the effective temperature in the standard (thermal) QNMs equation obtaining [13, 16, 17, 20–24]:Here and are real numbers with and for (scalar and gravitational perturbations), and for (vector perturbations), and and for half-integer values of .

Now, let us see how the corrections due to the GUP and to noncommutative geometry change the model. As we use the modified GUP in noncommutative effective Schwarzschild line element (32) instead of the effective Schwarzschild line element (12), (38) must be replaced by The solution of (39) in terms of readsClearly, a BH does not emit more energy than its total mass [13, 16, 17, 20–24]. In this case, we must take into account the corrections to the mass arising from the GUP and noncommutative geometry. Thus, the physical solution is the one obeyingthat is, is the value of total energy emitted by the BH when it is excited at a level [13, 16, 17, 20–24].

Let us consider an emission from the ground state (i.e., a BH that is not excited) to a state with large . Then, by using (42), the GUP corrected mass of the analogous BH changes from to If now one considers a transition from to a different state with , having , the GUP corrected mass of the analogous BH changes again from to in previous equation is given byand it represents the jump between the two levels due to the emission of a particle having frequency . Such a discrete amount of energy corresponds to a quantum jump. The issue that for large one finds independence on the other quantum numbers is perfectly consistent with* the Correspondence Principle* stated by Bohr [45]. This principle indeed claims that “transition frequencies at large quantum numbers should equal classical oscillation frequencies.” We stress again the analogy with Bohr’s hydrogen atom. In fact, in that model [43, 44], energy is gained and lost by electrons through quantum jumps from one allowed energy shell to another. Hence, radiation can be absorbed or emitted and the energy difference of the levels respects the Planck relation (in standard units), where is the Planck constant and is the transition frequency. In the present GUP corrected analogous Bohr-like BH, QNMs (the “gravitational electrons”) only gain and lose energy through jumps from one allowed energy shell to another with absorptions or emissions of Hawking quanta, but now the energy difference of the levels is governed by (45). Remarkably, one interprets (42) in terms of a particle, the “electron,” which is quantized on a circle of length This finalizes the cited similarity to Bohr’s hydrogen atom. Equation (46) represents indeed a perfect analogy with the electron travelling around the hydrogen nucleus with circular orbits in Bohr’s approach [43, 44] and is also similar to planets travelling around the Sun in our solar system. We stress that Bohr’s hydrogen atom represents an approximated model with respect to the valence shell atom model of full quantum mechanics. In the same way, the present GUP corrected analogous Bohr-like BH should be a better approximated model with respect to previous results in [13, 20–23]. But it is still far from the final, currently unknown, BH model of a full unitary quantum gravity theory.

Now, let us set and in (45). We get the emitted energy for a jump between two neighboring levels asBekenstein [25] has shown that the Schwarzschild BH area quantum should be (the* Planck length* cm is equal to one in Planck units). In Schwarzschild BHs, the* horizon area* is connected to the mass by the relation . Hence, a variation of the mass enables the variation of the area. Setting (the case of an emission), if one uses (43) and (47), one getsOne can think that (49) gives the area quantum of an excited GUP corrected analogous BH for a jump from the level to the level in function of the “overtone” number and of the initial GUP corrected analogous BH mass. But we see that one has a problem using (49). An absorption from the level to the level is indeed possible through the absorbed energy:Hence, if one sets , one gets a quantum of areaThus, one finds that the absolute value of the area quantum for an absorption between two levels is not the same as the absolute value of the area quantum for an emission between the same levels. This is because . Instead, we intuitively expect the area spectrum to be equal for both absorption and emission [13, 22]. One solves this problem considering the* GUP corrected analogous effective mass* which corresponds to the transitions between the two levels and . This latter is indeed the same for emission and absorption:Hence, let us replace with in (49) and again with in (51). We find Thus, now one gets . Equations (50) and (52) and some algebra giveThus, we find the very intriguing result that the famous law of Bekenstein on the area quantization [25] is affected neither by noncommutative geometry nor by the GUP. This is a clear indication of the universality of Bekenstein’s result on the area quantization [25].

If one puts and , one finds the formulas of the number of quanta of area asbefore the emission andafter the emission, respectively. This implies thatas one expects. Now, one can write down the famous formula of Bekenstein-Hawking entropy [1, 46, 47] asbefore the emission andafter the emission, respectively. Hence, the Bekenstein-Hawking entropy can be written as a function of the QNMs principal quantum number, that is, of the BH quantum excited state. Equations (58) and (59) permit to generalize the results in [13, 20–24] to the current case of the GUP corrected mass of the analogous BH.

Now, we recall that the Bekenstein-Hawking entropy cannot be considered the definitive answer for a correct quantum theory of gravity [48]. It is indeed very important going beyond the Bekenstein-Hawking entropy and finding its subleading corrections [48]. By using the quantum tunnelling approach, one remarkably arrives to the subleading corrections at third-order approximation [49]:In this approach, the total BH entropy depends on four different parts: the standard Bekenstein-Hawking entropy, a logarithmic term, an inverse area term, and an inverse squared area term [49]. Thus, one can find the formulas of the total BH entropy taking into account the subleading corrections at third-order approximation and considering the GUP corrected mass of the analogous BH asbefore the emission andafter the emission, respectively. Therefore, the total BH entropy at third-order approximation can be written as a function of the BH excited state Again, here we improve the results in [13, 20–24] to the current case of the GUP corrected mass of the analogous BH.

#### 5. Summary and Concluding Remarks

The present work considers GUP correction of nonthermal radiation spectrum in the background of noncommutative geometry using the framework of tunnelling mechanism. At first, we formulated the line element for Schwarzschild BH in the context of noncommutative geometry. Then we introduced the notion of effective temperature, effective mass, and effective horizon radius considering contributions beyond semiclassical approximation. Also, following the idea of one of us, Christian Corda, we have determined the nonstrictly thermal distributions for bosons and fermions. Subsequently, we introduce the GUP correction to the BH dynamical geometry by finding the final distributions for the GUP corrected mass of the analogous BH.

After that, it has been shown that the GUP and the noncommutative geometry modify the Bohr-like BH model, recently discussed in [13, 20–24]. In particular, we found the intriguing result that the famous law of Bekenstein on the area quantization [25] is affected neither by noncommutative geometry nor by the GUP. This is a clear indication of the universality of Bekenstein’s result. Finally, it has been shown that both the Bekenstein-Hawking entropy and the total BH entropy to third-order approximation are still functions of the BH quantum level, generalizing the results in [13, 20–24].

#### Conflicts of Interest

The authors declare that they have no conflicts of interest.

#### Acknowledgments

Subenoy Chakraborty acknowledges IUCAA, Pune, India, for their warm hospitality and research facilities at library. Subenoy Chakraborty also acknowledges the UGC-DRS Programme in the Department of Mathematics, Jadavpur University. Sourav Haldar is thankful to UGC NET-JRF for awarding research fellowship. Christian Corda has been supported financially by the Research Institute for Astronomy and Astrophysics of Maragha (RIAAM) (Project no. 1/4717-112).

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#### Copyright

Copyright © 2018 Sourav Haldar et al. 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 SCOAP^{3}.