Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"cosmic censorship"”.
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Cosmic Censorship: A study of the behavior of regular black holes
The Weak Cosmic Censorship Conjecture (CCC) generally states that all singularities must be hidden behind the event horizon. Consequently, this conjecture forbids the destruction of event horizons in singular black holes, since their removal would expose naked singularities. Regular black holes, by …
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From Quantum Information to Cosmic Censorship: Emergent Spacetimes and Their Surfaces
… that holography enforces a refined version of Cosmic Censorship that potentially can replace the Weak Cosmic Censorship (WCC) conjecture, which has been disproven in Anti-de Sitter (AdS) spacetimes. We show that certain important GR results usually proven assuming WCC can instead be derived …
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Violating the Weak Cosmic Censorship Conjecture in Asymptotically Anti-de Sitter Space-Times
… case, violate the spirit of the Weak Cosmic Censorship Conjecture, so that this conjecture fails in 3+ 1 dimensional asymptotically Anti de-Sitter spaces. We then argue that if charged fields are included with a sufficiently large charge relative to their mass, cosmic censorship …
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The imprint of scalar clouds around Kerr black holes: hairy solutions and weak cosmic censorship
… idea for a plausible counterexample to the Weak Cosmic Censorship Conjecture in flat four dimensions, based on the cascading of energies, as seen in AdS \cite{Dias:2015rxy,niehoff2016towards}, whereby with time even higher superradiant modes become dominant and form clouds around the black hole. …
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Approaching the Singularity in Gowdy Universes
It has been shown that the cosmic censorship conjecture holds for polarized Gowdy spacetimes. In the more general, unpolarized case, however, the question remains open. It is known that cylindrically symmetric dust can collapse to form a naked singularity. Since Gowdy universes comprise …
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Diophantine Approximation as Cosmic Censor for AdS Black Holes
… general relativity, more precisely, the Strong Cosmic Censorship conjecture. The main results provide theorems which resolve a linear scalar analog of the Strong Cosmic Censorship conjecture in general relativity for Λ < 0. The proofs are intimately tied to small divisors and the resolution …
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Naked singularities in self-similar gravitational collapse: Stability properties of the Cauchy horizon
The background of this thesis is the cosmic censorship hypothesis, which states that the gravitational collapse of physically reasonable matter should not result in the formation of naked singularities. In the absence of a proof of this hypothesis, much effort has been directed towards examining …
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Wave Equations on Curved Spacetimes
… which are the stability problem and the strong cosmic censorship conjecture. Both of these are ex- tremely difficult, but we can gain some insight by studying linear versions of them. These simplifications give rise to wave equations on curved spacetimes. We investigate the classical stability …
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Numerical Construction of Gravitational Solutions in Asymptotically Anti-de Sitter Spacetimes
… has been important in the context of the weak cosmic censorship hypothesis. In order to study this relationship, we constructed novel four-dimensional asymptotically global AdS solutions by turning on a dipolar differential rotation at the conformal boundary. At fixed energy and boundary …
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Gravitational waves: understanding black holes
… to the predictions of general relativity and the cosmic censorship hypothesis. It is expected that the gravitational field should be well described by the famous Kerr solution. Two approaches for testing this hypothesis are considered; one using X-ray observations and one using gravitational …
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Charged scalar fields on Black Hole space-times
… charged gravitational collapse and the Strong Cosmic Censorship conjecture. The latter problem is related to the question of Determinism of General Relativity, and roughly states that the maximal development of admissible initial data is inextendible. This question is intimately connected to …
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Numerical simulations of instabilities in general relativity
… evidence that in higher dimensions, the weak cosmic censorship conjecture may be violated even in asymptotically flat spacetimes. For Myers-Perry black holes, we investigate instabilities in five and six dimensions. In six dimensions, we demonstrate that both axisymmetric and non-axisymmetric …
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Applications of Numerical Relativity Beyond Astrophysics
… to result in an eventual violation of the weak cosmic censorship conjecture. A landmark simulation of the black string confirmed this in the Kaluza–Klein setting, however the generalisation of this setup to asymptotically flat black rings poses new challenges for numerical relativity. Even after …
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Caustics in gravitational theories
… to both the strong and weak versions of the cosmic censorship hypothesis. In fact, Yodzis and collaborators prove that an event horizon is generated to the future of the initial singularity, so that these types of singularity are naked. If, however, a solution to the field equations …
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Quasinormal Modes of Nearly Extremal Black Holes
… constant, they are closely tied to the Strong Cosmic Censorship Conjecture: if the spectral gap is too large, the modes don't decay slowly enough to destabilise the Cauchy horizon. From the large variety of examples in the literature of nearly extremal black holes with zero-damped modes, it is …
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Quantum Corrected and Nonsingular Black Holes: Theoretical and Phenomenological Aspects
… that these quantum effects strengthen the weak cosmic censorship, thereby enhancing the stability of the black-hole horizon. Subsequently, the spacetime geometry generated by a point-like source in a superposition of different locations is considered. It is shown that the quantum corrections, …