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Gravitational Collapse and Singularity Removal in Rastall Theory
Published 2021-01-01“…In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. …”
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Special N-dimensional charged anti-de-Sitter black holes in f(Q) gravitational theory
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Axially Symmetric Null Dust Space-Time, Naked Singularity, and Cosmic Time Machine
Published 2017-01-01“…The radial geodesics near the singularity and the gravitational lensing (GL) will be discussed. …”
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Axial Symmetry Cosmological Constant Vacuum Solution of Field Equations with a Curvature Singularity, Closed Time-Like Curves, and Deviation of Geodesics
Published 2020-01-01“…We wish to discuss the physical properties and show that this solution can be interpreted as gravitational waves of Coulomb-type propagate on anti-de Sitter space backgrounds. …”
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The Quantization of a Kerr-AdS Black Hole
Published 2018-01-01“…We also prove that the Kerr-AdS space-time can be maximally extended by replacing in a generalized Boyer-Lindquist coordinate system the r variable by ρ=r2 such that the extended space-time has a timelike curvature singularity in ρ=-a2.…”
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Regular black holes from pure gravity
Published 2025-02-01“…We show via an explicit construction how an infinite tower of higher-curvature corrections generically leads to a resolution of the Schwarzschild singularity in any spacetime dimension D≥5. The theories we consider have two key properties that ensure the results are general and robust: (1) they provide a basis for (vacuum) gravitational effective field theory in five and higher-dimensions, (2) for each value of the mass, they have a unique static spherically symmetric solution. …”
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Spacetime Junctions and the Collapse to Black Holes in Higher Dimensions
Published 2012-01-01“…The vacuum exterior solutions are either static or containing gravitational waves. We then review the global geometrical properties of the matched solutions which, besides black holes, may include the existence of naked singularities and wormholes. …”
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Isotropy of an Upper Limb Exoskeleton and the Kinematics and Dynamics of the Human Arm
Published 2009-01-01“…One of the potential implications of these results might be the need to compensate gravitational load during robotic-assistive rehabilitation treatment. …”
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On stabilization of magnetically charged brane shell and over-extremality
Published 2025-01-01“…Abstract In string theory, we can geometrically realize a metastable state by wrapping D5-branes and anti D5-branes to a singular manifold. We consider wrapping D3-branes to the internal space in this setup. …”
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Double logarithms in N $$ \mathcal{N} $$ ≥ 4 supergravity: weak gravity and Shapiro’s time delay
Published 2020-01-01“…This screening of the gravitational interaction at short distances in the double logarithmic sector of the amplitudes is more acute as the number of gravitinos in the theory increases. …”
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Parameter constraints on a black hole with Minkowski core through quasiperiodic oscillations
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Hybrid Technique to Improve the River Water Level Forecasting Using Artificial Neural Network-Based Marine Predators Algorithm
Published 2022-01-01“…The finding demonstrated that singular spectrum analysis is a highly effective method to denoise time series. …”
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