De Sitter
O universo de Einstein-de Sitter perturbado
... Por outro lado, construímos ura modelo cosmológico não homogêneo, dotado de um campo local de velocidades, a partir do modelo cosmológico de Einstein-de Sitter, que é homogêneo e despr[r] ...
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Bounded energy waves on the black hole interior of Reissner–Nordström–de Sitter
... om-de Sitter spacetimes it is, in some sense, the higher stability of their exterior regions, when compared with their asymptotically flat counterparts, that is responsible for the higher stability of their Cauchy ...
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Analogue Model For Anti-de Sitter As A Description Of Point Sources In Fluids
... anti-de Sitter space calls for a boundary condition at r = 0, which corresponds to a choice of a self-adjoint extension of the (spatial part of) the wave ...
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A gap theorem for complete constant scalar curvature hypersurfaces in the de Sitter space
... In 1977, Goddard [8] conjectured that the only complete space-like hypersurfaces (those whose induced metric is Riemannian) in S n+1 1 with constant mean curvature are the totally umbilical ones. Montiel [12] proved this ...
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Modos quase-normais de buracos negros plano-simétricos anti-de sitter em d dimensões
... anti-de Sitter em d dimens˜oes, cuja geometria das se¸c˜oes espaciais ´e plana e cuja topologia pode ser plana, cil´ındrica ou ...anti-de Sitter em cinco e seis dimens˜oes, e os modos quase-normais das ...
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On Complete Spacelike Hypersurfaces with Constant Scalar Curvature in the De Sitter Space
... Let M n be a complete spacelike hypersurface with constant normalized scalar curvature R in the de Sitter Space S 1 n +1 . Let H the mean curvature and suppose that R = (R − 1) > 0 and R ≤ sup H 2 ≤ C R , where ...
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Rigidity results for submanifolds with parallel mean curvature vector in the De Sitter space
... of mean curvature H in the De Sitter space S 3 1 (c) of constant curvature c > 0. (This result was generalized by Cheng in 1991 [3] to general submanifolds in the De Sitter space.) One year later S. ...
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Anti-de-Sitter regular electric multipoles: Towards Einstein-Maxwell-AdS solitons
... Anti-de-Sitter (AdS) gravity has been under intense scrutiny, motivated, in particular, by the gauge–gravity duality [1] . A central question one may ask, as for asymptotically flat gravity, is under which ...
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Hadamard states for a scalar field in anti-de Sitter spacetime with arbitrary boundary conditions
... In a recent paper [C. Dappiaggi and H. C. R. Ferreira, Phys. Rev. D 94, 125016 (2016) ], the authors argued that the singularities of the two-point functions on the Poincar´e domain of the n-dimensional anti–de ...
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Erratum to “A gap theorem for complete constant scalar curvature hypersurfaces in the de Sitter space”
... Erratum to “A gap theorem for complete constant scalar curvature hypersurfaces in the de Sitter space”.. [J.[r] ...
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Dirac perturbations on Schwarzschild-anti-de Sitter spacetimes: Generic boundary conditions and new quasinormal modes
... We study Dirac quasinormal modes of Schwarzschild –anti–de Sitter (Schwarzschild-AdS) black holes, following the generic principle for allowed boundary conditions proposed in [M. Wang, C. Herdeiro, and M. O. P. ...
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Loop quantization of a model for D = 1 + 2 (anti)de sitter gravity coupled to topological matter
... We have proceeded to the loop quantization of D = 1 + 2 gravity with a cosmological constant and a coupling with topological matter fields defined via a semi-simple extension of the de Sitter or anti-de ...
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Thermodynamic properties of asymptotically anti-de Sitter black holes in d=4 Einstein-Yang-Mills theory
... As a result, the subject of BH thermodynamics has enjoyed a constant interest over the last four decades. BH solutions in anti- de Sitter (AdS) spacetime background have been considered also in this context. For ...
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Maxwell perturbations on Kerr-anti-de Sitter black holes: Quasinormal modes, superradiant instabilities, and vector clouds
... Scalar and gravitational perturbations on Kerr –anti–de Sitter (Kerr-AdS) black holes have been addressed in the literature and have been shown to exhibit a rich phenomenology. In this paper, we complete the ...
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Maxwell perturbations on asymptotically Anti-de-Sitter spacetimes: generic boundary conditions and a new branch of quasinormal modes
... Perturbations of asymptotically Anti-de-Sitter (AdS) spacetimes are often considered by imposing field vanishing boundary conditions (BCs) at the AdS boundary. Such BCs, of Dirichlet-type, imply a vanishing energy ...
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Um teorema tipo-Picard para a aplicação de Gauss hiperbólica de superfícies CMC-1 imersas no espaço hiperbólico e no espaço de Sitter 3-dimensional.
... As superfícies de Bryant com curvatura total finita, porém, não são os únicos candidatos. Ainda no contexto hiperbólico é possível citar mais dois possíveis casos de supéficies naturais onde tal investigação pode ser ...
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Notes On Conservation Laws, Equations Of Motion Of Matter, And Particle Fields In Lorentzian And Teleparallel De Sitter Space-time Structures
... de Sitter spacetime with the result that these curves are not geodesics is equivocated, since those authors use constrained variations in- stead of arbitrary variations of the length ...
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Hipersuperfícies tipo-espaço com curvatura de ordem superior constante no espaço de Sitter.
... Nesta seção, vamos introduzir as Transformações de Newton, que serão de nidas a partir do operador de forma A. Mostraremos as suas principais propriedades, e usaremos estas aplicações no próximo capítulo para obter as ...
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Interaction of Hawking radiation with static sources in de Sitter and Schwarzschild-de Sitter spacetimes
... where q is a small coupling constant 兲 of such a source when it is uniformly accelerated with the same proper acceleration in the inertial vacuum of Minkowski spacetime or, equiva- lently, when it is static in the FDU ...
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De Sitter relativity and quantum physics
... This scenario fits quite reasonably with the idea that a high-energy experiment should modify the local structure (texture) of spacetime. The important point is that the de Sitter speci[r] ...
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