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Добірка наукової літератури з теми "Einstein-Maxwell-Scalar system"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Einstein-Maxwell-Scalar system"

Koh, I. G., Y. S. Myung, and H. Nishino. "Stability analysis of Einstein/Maxwell-scalar system." Physical Review D 32, no. 12 (December 15, 1985): 3195–200. http://dx.doi.org/10.1103/physrevd.32.3195.

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Jantzen, Robert T. "Finite-dimensional Einstein-Maxwell-scalar field system." Physical Review D 33, no. 8 (April 15, 1986): 2121–35. http://dx.doi.org/10.1103/physrevd.33.2121.

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Tadmon, Calvin, and Sophonie Blaise Tchapnda. "On the spherically symmetric Einstein–Yang–Mills–Higgs equations in Bondi coordinates." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2146 (June 15, 2012): 3191–214. http://dx.doi.org/10.1098/rspa.2012.0171.

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We revisit and generalize, to the Einstein–Yang–Mills–Higgs (EYMH) system, previous results of Christodoulou and Chae concerning global solutions for the Einstein-scalar field and the Einstein–Maxwell–Higgs (EMH) equations. The novelty of the present work is twofold. For one thing, the assumption on the self-interaction potential is improved. For another thing, explanation is furnished why the solutions obtained here and those proved by Chae for the EMH system decay more slowly than those established by Christodoulou in the case of self-gravitating scalar fields. Actually, this latter phenomenon stems from the non-vanishing local charge in EMH and EYMH models.

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Fabris, Júlio C., Tales Augusto Oliveira Gomes, and Denis Campos Rodrigues. "Black Hole and Wormhole Solutions in Einstein–Maxwell Scalar Theory." Universe 8, no. 3 (February 27, 2022): 151. http://dx.doi.org/10.3390/universe8030151.

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We classified and studied the charged black hole and wormhole solutions in the Einstein–Maxwell system in the presence of a massless, real scalar field. The possible existence of charged black holes in general scalar–tensor theories was studied in Bronnikov et al., 1999; black holes and wormholes exist for a negative kinetic term for the scalar field. Using a conformal transformation, the static, spherically symmetric possible structures in the minimal coupled system are described. Besides wormholes and naked singularities, only a restricted class of black hole exists, exhibiting a horizon with an infinite surface and a timelike central singularity. The black holes and wormholes defined in the Einstein frame have some specificities with respect to the non-minimal coupling original frame, which are discussed in the text.

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Nurmagambetov, A. J., and I. Y. Park. "Quantum-Gravitational Trans-Planckian Energy of a Time-Dependent Black Hole." Symmetry 11, no. 10 (October 16, 2019): 1303. http://dx.doi.org/10.3390/sym11101303.

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We continue our recent endeavor in which a time-dependent black hole solution of a one-loop quantum-corrected Einstein-scalar system was obtained and its near-horizon behavior was analyzed. The energy analysis led to a trans-Planckian scaling behavior near the event horizon. In the present work, the analysis is extended to a rotating black hole solution of an Einstein–Maxwell-scalar system with a Higgs potential. Although the analysis becomes much more complex compared to that of the previous, we observe the same basic features, including the quantum-gravitational trans-Planckian energy near the horizon.

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Norbert, Noutchegueme. "GLOBAL REGULAR SOLUTION FOR THE EINSTEIN-MAXWELL-BOLTZMANN-SCALAR FIELD SYSTEM IN A BIANCHI TYPE-I SPACE-TIME." JOURNAL OF ADVANCES IN MATHEMATICS 13, no. 1 (March 30, 2017): 7087–118. http://dx.doi.org/10.24297/jam.v13i1.5982.

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We prove an existence and uniqueness of regular solution to the Einstein-Maxwell-Boltzmann-Scalar Field system with pseudo-tensor of pressure and the cosmological constant globaly in time. We clarify the choice of the function spaces and we establish step by step all the essential energy estimations leading to the global existence theorem.

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Panotopoulos, Grigoris, and Ángel Rincón. "Charged slowly rotating toroidal black holes in the (1 + 3)-dimensional Einstein-power-Maxwell theory." International Journal of Modern Physics D 28, no. 01 (January 2019): 1950016. http://dx.doi.org/10.1142/s0218271819500160.

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In this work, we find charged slowly rotating solutions in the four-dimensional Einstein-power-Maxwell nonlinear electrodynamics assuming a negative cosmological constant. By solving the system of coupled field equations explicitly, we obtain an approximate analytical solution in the small rotation limit. The solution obtained is characterized by a flat horizon structure, and it corresponds to a toroidal black hole. The Smarr’s formula, the thermodynamics and the invariants Ricci scalar and Kretschmann scalar are briefly discussed.

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Lazaroiu, C. I., and C. S. Shahbazi. "Generalized Einstein-Scalar-Maxwell theories and locally geometric U-folds." Reviews in Mathematical Physics 30, no. 05 (May 31, 2018): 1850012. http://dx.doi.org/10.1142/s0129055x18500125.

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We give the global mathematical formulation of the coupling of four-dimensional scalar sigma models to Abelian gauge fields on a Lorentzian four-manifold, for the generalized situation when the duality structure of the Abelian gauge theory is described by a flat symplectic vector bundle [Formula: see text] defined over the scalar manifold [Formula: see text]. The construction uses a taming of [Formula: see text], which we find to be the correct mathematical object globally encoding the inverse gauge couplings and theta angles of the “twisted” Abelian gauge theory in a manner that makes no use of duality frames. We show that global solutions of the equations of motion of such models give classical locally geometric U-folds. We also describe the groups of duality transformations and scalar-electromagnetic symmetries arising in such models, which involve lifting isometries of [Formula: see text] to the bundle [Formula: see text] and hence differ from expectations based on local analysis. The appropriate version of the Dirac quantization condition involves a discrete local system defined over [Formula: see text] and gives rise to a smooth bundle of polarized Abelian varieties, endowed with a flat symplectic connection. This shows, in particular, that a generalization of part of the mathematical structure familiar from [Formula: see text] supergravity is already present in such purely bosonic models, without any coupling to fermions and hence without any supersymmetry.

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Mazharimousavi, S. Habib, and M. Halilsoy. "Einstein–Born–Infeld black holes with a scalar hair in three dimensions." Modern Physics Letters A 30, no. 33 (October 13, 2015): 1550177. http://dx.doi.org/10.1142/s0217732315501771.

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We present black hole solutions in (2+1)-dimensional Einstein’s theory of gravity coupled with Born–Infeld (BI) nonlinear electrodynamic and a massless self-interacting scalar field. The model has five free parameters: mass [Formula: see text], cosmological constant [Formula: see text], electric [Formula: see text] and scalar [Formula: see text] charges and BI parameter [Formula: see text]. To attain exact solution for such a highly nonlinear system we adjust, i.e. finely tune, the parameters of the theory with the integration constants. In the limit [Formula: see text], we recover the results of Einstein–Maxwell–Scalar theory, obtained before. The self-interacting potential admits finite minima apt for the vacuum contribution. Hawking temperature of the model is investigated versus properly tuned parameters. By employing this tuned-solution as basis, we obtain also a dynamic solution which in the proper limit admits the known solution in Einstein gravity coupled with self-interacting scalar field. Finally, we establish the equations of a general scalar–tensor field coupled to nonlinear electrodynamics (NED) field in 2+1 dimensions without searching for exact solutions.

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Jaramillo, Víctor, Daniel Martínez-Carbajal, Juan Carlos Degollado, and Darío Núñez. "Born-Infeld boson stars." Journal of Cosmology and Astroparticle Physics 2023, no. 07 (July 1, 2023): 017. http://dx.doi.org/10.1088/1475-7516/2023/07/017.

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Abstract We study the Einstein-Klein-Gordon system coupled to the Born-Infeld electrodynamics. We explore the solution space of a static spherically symmetric, complex scalar field minimally coupled to both gravitational and electromagnetic fields. The resulting asymptotically flat solutions resemble the known charged boson stars in Maxwell electrodynamics. The behaviour of such configurations as a function of the Born-Infeld parameter b and the scalar field charge parameter q has been analyzed. Given b, a critical value for q exists beyond which no static solutions exist, we find that the value of this critical charge increases with respect to the Maxwell case (b → ∞) as b decreases. We also found that Born-Infeld boson stars have lower mass for any finite value of the Born-Infeld parameter and that their compactness is lower than Maxwell's counterparts.

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Дисертації з теми "Einstein-Maxwell-Scalar system"

Svedberg, Christopher. "Future stability of the Einstein-Maxwell-Scalar field system and non-linear wave equations coupled to generalized massive-massless Vlasov equations." Doctoral thesis, KTH, Matematik (Avd.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93891.

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This thesis consists of two articles related to mathematical relativity theory. In the first article we prove future stability of certain spatially homogeneous solutionsto Einstein’s field equations. The matter model is assumed to consist of an electromagnetic field and a scalar field with a potential creating an accelerated expansion. Beside this, more general properties concerning Einstein’s field equation coupled to a scalar field and an electromagnetic field are settled. The most important of these questions are the existence of a maximal globally hyperbolic development and the Cauchy stability of solutions to the initial value problem. In the second article we consider Einstein’s field equations where the matter model consists of two momentum distribution functions. The first momentum distribution function represents massive matter, for instance galactic dust, and the second represents massless matter, for instance radiation. Furthermore, we require that each of the momentum distribution functions shall satisfy the Vlasov equation. This means that the momentum distribution functions represent collisionless matter. If Einstein’s field equations with such a matter model is expressed in coordinates and if certain gauges are fixed we get a system of integro-partial differential equations we shall call non-linear wave equations coupled to generalized massive-massless Vlasov equations. In the second article we prove that the initial value problem associated to this kind of equations has a unique local solution.
QC 20120503

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Yuan, Pei-Hung, and 袁珮閎. "Holographic Applications of Einstein-Maxwell-scalar System in Strongly Coupled Problems." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f7tgsq.

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Анотація:

博士
國立交通大學
物理研究所
105
Holographic theory is one of the most important theories in last two decades. It delivers a whole new aspect to make a bridge between a space-time and its boundary and claims that the information involves in the bulk are equivalent to the amounts where the boundary enclosed. From the phenomenology point of view, Einstein-Maxwell-scalar is a very general system. On the other hand, we can also derive the EMS form from supergravity by taking the low energy limit of the superstring theory. Therefore, it is worth to understand the EMS system not only in phenomenology but also has theoretical importance. In this thesis, I analytically derive a higher dimensional space-time blackening solutions in Einstein-Maxwell-scalar system systematically. By studying the analytic black hole solution, I can control the changes of physical quantities and understand physical inside within the structures, such as speed of sound and confinement phase transition in QCD, metal/insulator phase transition and also the entanglement entropy, and so on and so forth.

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