LANDAU AND LIFSHITZ PRESCRIPTION FOR A REGULAR BLACK HOLE
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1 SHORT NOTE ASTROPHYSICS LANDAU AND LIFSHITZ PRESCRIPTION FOR A REGULAR BLACK HOLE IRINA RADINSCHI and BRÎNDUSA CIOBANU Department of Physics, Gh. Asachi Technical University, Iaºi, 6600, Romania radinschi@yahoo.com, bciobanu@phys.tuiasi.ro Received July 9, 005 In this paper we continue our study about the energy of a regular black hole in the Landau and Lifshitz prescription. The energy depends on the mass m and charge e of the black hole. We make a discussion of the energy in function of the value of the mass m and charge e of the black hole. For e = 0 or at large distances, the expression of energy reduces to the energy of the Schwarzschild metric that is given by m. This is the same result as that obtained by Sharif for the charge e = 0 or at large distances. The calculations are performed with the Maple program that has attached the GrTensor II version 1.50 platform. 1. INTRODUCTION The subject of the localization of energy continues to be an open one since Einstein [1] has given his important result of the special theory of relativity that mass is equivalent to energy. Misner et al. [] sustained that to look for a local energy-momentum means that is looking for the right answer to the wrong question. Also, they concluded that the energy is localizable only for spherical systems. On the other hand, Cooperstock and Sarracino [] demonstrated that if the energy is localizable in spherical systems then it is also localizable in any space-times. Bondi [4] gave his opinion that a nonlocalizable form of energy is not admissible in general relativity, because any form of energy contributes to gravitation and so its location can in principle be found. Related on the method that used the energy-momentum complexes we can say that there are doubts that these prescriptions could give acceptable results for a given space-time. This is because most of the energy-momentum complexes are restricted to the use of particular coordinates. But some interesting results obtained by several authors [5, 6] demonstrated that the energy-momentum complexes are good tools for evaluating the energy and momentum in general relativity. In this paper we study the energy distribution of a regular black hole in the Landau and Lifshitz prescription [7]. The energy distribution depends on the Rom. Journ. Phys., Vol. 50, Nos. 9 10, P. 1 17, Bucharest, 005
2 14 Irina Radinschi, Brîndusa Ciobanu mass m and charge e of the black hole. We make a discussion in function of the value of the mass m and charge e of the black hole. Also, we give the program for the Landau and Lifshitz energy-momentum complex. Through the paper we use geometrized units (G = 1, c = 1) and follow the convention that Latin indices run from 0 to.. ENERGY OF THE BLACK HOLE The solution that we study was given by Bardeen [8] and represents a regular black hole obeying weak energy condition, and it was powerful in shaping the direction of research on the existence or avoidance of singularities. The metric is given by = ds 1 dt dr r dθ r sin θdϕ ( r + e) 1 + ( r e ). For the charge e = 0 the metric reduces to the Schwarzschild metric. In the Landau and Lifshitz prescription [7] we obtained for the energy distribution [9] the expression E = ( r + e ) + (1). () For e = 0 or at large distances, the expression of energy reduces to the energy of the Schwarzschild metric that is given by m. This is the same result as that obtained by Sharif for the charge e = 0 or at large distances. From () it results that the energy distribution depends on the mass m and charge e of the black hole. If the charge e vanishes we obtain for the energy distribution the value E =. () r We give the Maple program, GrTensor version 1.50 that we used for calculating the components of the Landau and Lifshitz energy-momentum complex: readlib(grii): grtensor(); grdef(`l(^m^j^n^k):=-detg*(g^m^j*g^n^k-g^m^n*g^j^k)`): Created definition for L(up,up,up,up) qload(bardeen);
3 Regular black hole 15 Calculating ds for bardeen... Done. ( sec.) grcalc(l(up,up,up,up)): Calculating detg for bardeen... Done. ( sec.) Calculating g(up,up) for bardeen... Done. ( sec.) Calculating detg for bardeen... Done. ( sec.) Calculating L(up,up,up,up) for bardeen... Done. ( sec.) grdef(`l4^m^j^n:=l^m^j^n^k,k`): grcalc(l4(up,up,up)): Calculating L(up,up,up,up,pdn) for bardeen... Done. ( sec.) Calculating L4(up,up,up) for bardeen... Done. ( sec.) grdisplay(l4(up,up,up)); In the following, we make a discussion related on the graphic representations of the expressions of energy given by () and (). For the expression given by (), first consider the value m = 1 for the mass of the black hole and we choose only positive values for the charge e of the black hole and, also, positive values for the r parameter. We have e = and r = We get the Fig. 1. Fig. 1. The energy distribution takes negative and, also, positive values. Lets see some modifications in the graphic representation of the expression of energy distribution E. First, we consider that we take e = and r = The graphic representation of the energy distribution is given in Fig.. If in the first case we have negative values and, also, positive values for the energy distribution in the second case we have only positive values for the energy of the black hole. The maximum of the energy is less than in the first case. Now, if we take for the charge e = 1 10 and for the r parameter r = we get the graphic representation from Fig..
4 16 Irina Radinschi, Brîndusa Ciobanu 4 Fig. Fig. The energy distribution of the black hole takes only positives values. The maximum of the energy is less than in the first case and greater than in the second case.. DISCUSSION One of the most interesting and challenging problems of relativity, the energy and momentum localization remained an open issue because the numerous attempts at constructing an energy-momentum density don't give a generally accepted expression. As we pointed out above, we can obtain good results related on the localization of energy with several energy-momentum complexes, particularly with the Landau and Lifshitz energy-momentum complex. The importance of the energy-momentum complexes was pointed out by Chang, Nester and Chen [10] who showed that the energy-momentum complexes are actually quasilocal and legitimate expression for the energymomentum. They concluded that there exist a direct relationship between
5 5 Regular black hole 17 energy-momentum complexes and quasilocal expressions because every energymomentum complexes is associated with a legitimate Hamiltonian boundary term. We use the Landau and Lifshitz prescription to compute the energy distribution of a regular charged black hole solution and, also, we make a discussion of the result. The energy of the regular black hole solution given by Bardeen [9] depends on the mass m and charge e of the black hole. In the case e = 0 or at large distances, the expression of energy reduces to the energy of the Schwarzschild metric that is given by m. This result is the same with the one obtained by Sharif for the charge e = 0 or at large distances. We make a comparison between our results for the energy distribution taking different values for the charge e of the black hole and r parameter. In all the cases we have the same value for the mass m of the black hole. The energy distribution takes negative and, also, positive values. The maximum of the energy is reached in the first case. These results sustain that the Landau and Lifshitz energy-momentum complex is a powerful tool for obtaining the energy distribution in a given space-time. REFERENCES 1. C. Műller, Ann. Phys. (NY) 4, 47, 1958; A. Trautman, in Gravitation: an Introduction to Current Research, ed. L. Witten Wiley, New York, p. 169, C. W. Misner, K. S. Thorne and J. A. Wheeler, Gravitation, W. H. Freeman and Co., NY, 60, F. I. Cooperstock and R. S. Sarracino, J. Phys. A: Math. Gen., 11, 877, H. Bondi, Proc. R. Soc. London, A47, 49, K. S. Virbhadra, Phys. Rev, D60, , 1999; S. S. Xulu, Int. J. Theor. Phys., 7, 177, 1998; S. S. Xulu, Int. J. Mod. Phys., D7, 77, 1998; E. C. Vagenas, hep-th/00716; I. Radinschi, Acta Physica Slovaca, 49(5), 789, 1999; I. Radinschi, Mod. Phys. Lett., A15, Nos. 11&1, 80, 000; T. Bringley, Mod. Phys. Lett., A17, 157, 00; M. Súkeník and J. Sima, gr-qc/010106; M. Sharif, hep-th/ R. Gad, gr-qc/040109; I. Radinschi, Mod. Phys. Lett., A15 (5), 171, 000; I-Ching Yang and I. Radinschi, Chin. J. Phys., 41, 6, 00; I-Ching Yang and I. Radinschi, grqc/00910; C. Ciubotariu, I. Radinschi, B. Ciobanu and C. Neacsu, Rom. J. Phys., 40(8 9), 799, L. D. Landau and E. M. Lifshitz, The Classical Theory of Fields, Pergamon Press, p. 80, J. Bardeen, Proc. GR5, Tiflis, USSR, I. Radinschi and B. Ciobanu, accepted for publication at Buletinul UTI, Chia-Chen Chang, J. M. Nester and Chiang-Mei Chen, Phys. Rev. Lett. 8, 1897, 1999.
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