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Spacetime Dependent Lagrangians and Electrogravity Duality  [PDF]
Debashis Gangopadhyay,R. Bhattacharyya,L. P. Singh
Physics , 2007,
Abstract: We apply the spacetime dependent lagrangian formalism [1] to the action in general relativity. We obtain a Barriola-Vilenkin type monopole solution by exploiting theelectrogravity duality of the vacuum Einstein equations and using a modified definition of empty space. An {\it upper bound} is obtained on the monopole mass ${\tt M}$, ${\tt M}\leq e^{(1-\alpha)/\alpha}/(1-\alpha)^{2}{\tt G}$ where $\alpha = 2k $ is the global monopole charge. Keywords: global monopole, electrogravity duality, holographic principle. PACS: 11.15.-q, 11.27.+d, 14.80.Hv, 04.
Massive particle quantum tunneling radiation of Barriola-Vilenkin black hole with global monopole
带有整体磁单极子的Barriola-Vilenkin黑洞时空中静质量不为零的粒子的量子隧穿辐射

Meng Qing-Miao,Su Jiu-Qing,Jiang Ji-Jian,
孟庆苗
,苏九清,蒋继建

物理学报 , 2007,
Abstract: The quantum tunneling framework is adopted to investigate tunneling radiation of Barriola-Vilenkin black hole with a global monopole. We obtain a conclusion that the emission rate of massive particles is related with the change of Bekenstein-Hawking entropy. The emission rates of massless and massive particles take the same functional form. It is consistent with the underlying unitary theory.
Global monopole in scalar tensor theory  [PDF]
A. Banerjee,A. Beesham,S. Chatterjee,A. A. Sen
Physics , 1997, DOI: 10.1088/0264-9381/15/3/014
Abstract: The well known monopole solution of Barriola and Vilenkin (BV) resulting from the breaking of a global SO(3) symmetry is extended in general relativity along with a zero mass scalar field and also in Brans-Dicke(BD) theory of gravity.In the case of BD theory, the behaviour of spacetime and other variables such as BD scalar field and the monopole energy density have been studied numerically.For monopole along with a zero mass scalar field, exact solutions are obtained and depending upon the choice of arbitary parameters, the solutions either reduce to the BV case or to a pure scalar field solution as special cases.It is interesting to note that unlike the BV case the global monopole in the BD theory does exert gravitational pull on a test particle moving in its spacetime.
Statistical entropy of Barriola-Vilenkin black hole
Barriola-Vilenkin黑洞的统计熵

Li Gu-Qiang,
李固强

物理学报 , 2004,
Abstract: The partition functions of bosonic and fermionic field in Barriola_Vilenkin black hole are directly derived by using the method of quantum statistics. Then the entropy of the Barriola_Vilenkin black hole is calculated by using the improved brick_wall method in the frame of membrane model.
Generalized Stenfan-Boltzmann law of the Dirac field of Barriola-Vilenkin black hole
Barriola-Vilenkin黑洞Dirac场的广义Stefan-Boltzmann定律

Meng Qing-Miao,Li Zhong-Rang,Li Yu-Shan,
孟庆苗
,李中让,李玉山

物理学报 , 2010,
Abstract: Using the thin film model of black hole, the thermal radiation laws of the Barriola-Vilenkin black hole are studied. We obtained the result that the thermal radiation of the black hole always satisfies the generalized Stenfan-Boltzmann law. The derived generalized Stenfan-Boltzmann coefficient is no longer a constant. When the cut-off distance and the thin film thickness are both fixed, it is a proportional coefficient related to the space-time metric near the event horizon and the average radial effusion velocity of the radiation particles in the thin film. The radiation energy flux of the Dirac field of the Barriola-Vilenkin black hole is proportional to the average radial effusion velocity of the radiation particles in the thin film, and inversely proportional to the square of the black hole mass.
Quantum Corrects to the Entropy of the Barriola Vilenkin Black Hole Due to Spin Fields
自旋场对Barriola-Vilenkin黑洞熵的量子修正

LI Gu-Qiang,LI Zhong-Heng,
李固强
,黎忠恒

数学物理学报(A辑) , 2003,
Abstract: The quantum corrections to the entropy of the Barriola-Vilenkin black hole due to the gravitation electromagnetic and neutrino fields are calculated by using the brick-wall model. It is shown that the quantum corrects consist in two parts: One is aquadratic divergent term at event horizon and is proportional to the surface area of the event horizon. The other is two logarithmically divergent terms which not only depend on the characteristics of the black hole but also on the spin of fields. The whole expression does not take the form of the scalar field.
Quantum corrections to the entropy of the Barriola-Vilenkin black hole due to sp in fields
自旋场对Barriola-vilenkin黑洞熵的量子修正

Li Gu-Qiang,
李固强

物理学报 , 2003,
Abstract: The quantum corrections to the entropy of the Barriola-Vilenkin black hole due to the massless gravitational field are calculated by using the brick-wall model.It is shown that the quantum corrections consist of two parts:One is a quadratic divergent term at the event horizon and is proportional to the surface area of the event horizon.The other is two logarithmically divergent terms which not only depend on the characteristics of the black hole but also on the spin of the field.The whole expression does not take the form of the scalar field.
Quasi-Asimptotically Flat Spacetimes and Their ADM Mass  [PDF]
Ulises Nucamendi,Daniel Sudarsky
Physics , 1996, DOI: 10.1088/0264-9381/14/5/031
Abstract: We define spacetimes that are asymptotically flat, except for a deficit solid angle $\alpha$, and present a definition of their ``ADM'' mass, which is finite for this class of spacetimes, and, in particular, coincides with the value of the parameter $M$ of the global monopole spacetime studied by Vilenkin and Barriola . Moreover, we show that the definition is coordinate independent, and explain why it can, in some cases, be negative.
Physics in the Global Monopole Spacetime
Bezerra de Mello, E.R.;
Brazilian Journal of Physics , 2001, DOI: 10.1590/S0103-97332001000200012
Abstract: in this paper we review some important aspects of the global monopole spacetime and present how this manifold modifies, at classical and quantum points of view, the movement of a charged particle. the explicit calculations of the renormalized vacuum expectation values of the energy-momentum tensors, átmn(x)?ren., associated with massless bosonic and fermionic fields are also presented. moreover the effect of the nonzero temperature in this previous formalism is analyzed. finally, we briefly present other applications of this manifold in the topological inflation and condensed matter system.
Physics in the Global Monopole Spacetime  [cached]
Bezerra de Mello E.R.
Brazilian Journal of Physics , 2001,
Abstract: In this paper we review some important aspects of the global monopole spacetime and present how this manifold modifies, at classical and quantum points of view, the movement of a charged particle. The explicit calculations of the renormalized vacuum expectation values of the energy-momentum tensors, áTmn(x) Ren., associated with massless bosonic and fermionic fields are also presented. Moreover the effect of the nonzero temperature in this previous formalism is analyzed. Finally, we briefly present other applications of this manifold in the topological inflation and condensed matter system.
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