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 19 of 19 for “"wormholes"”.
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Traversable Wormholes in Kerr Black Holes
Wormholes have long been a source of interest in general relativity, having been first coined by John Wheeler in 1957. More recently, wormholes have proven instrumental to our understanding of quantum gravity, with particular interest being given to Euclidean wormholes and their relevance to the …
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The life of quanta : entanglement wormholes and the second law
… area of Einstein-Rosen (ER) bridges (or wormholes) connecting them. We show that the geometrical entropy of classical ER bridges satisfies the subadditivity, triangle, strong subadditivity, and CLW inequalities. These are nontrivial properties of entanglement entropy, so this is evidence …
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Perturbations and symmetry in gravitational theories : wormholes, wave dynamics, and quantum effects in rotating spacetimes.
… treatment shows that horizonless rotating wormholes exhibit Bogoliubov mode mixing, superradiant amplification, and entanglement generation driven by rotational asymmetry. These results demonstrate how symmetry principles unify perturbative observables and quantum effects across …
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Discovering Relationships between Reservoir Properties and Production Data for CHOPS Using Data Mining Methods
… oil recovery. It’s generally believed that wormholes, resulting from sand flow, enhance oil recovery in this process. However, due to complexity and variability, it’s difficult for wormhole models to precisely describe how wormholes develop within the formation. In this study, we regard …
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Experimental and theoretical studies of reactive transport processes in soluble porous rocks
… and reaction in the rock matrix often induce wormholes, which are long, finger-like channels that form due to the dissolution heterogeneity in the matrix. These wormholes become major flow pathways, which greatly increase the permeability of the rock. To study the reactive transport processes …
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The wave function of the universe
… Hawing and D.N. Page (1990) in the context of wormholes. Wormholes are generally considered to play a major role in setting the cosmological constant to zero and to provide a mechanism for black hole evaporation. It is significant that we are able to show that even the class of bulk matter …
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Quantum Effects of the Massless Spin One-Half Field in Static Spherically Symmetric Black Hole and Wormhole Spacetimes
… results for the full stress-energy tensors for wormholes are analyzed in terms of an arbitrary renormalization parameter to see if the ``exotic" energy condition needed to keep such an object from collapsing are met. No wormhole geometry studied is found to be a self-consistent solution when …
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A Hierarchical Algorithm for Probabilistically Complete Path Planning in Multi-Floor Environments
… of 2D maps, representing floors, connected by “wormholes”, which represent elevators and other between-floor connections. The full topological structure of the space can thus be described as a weighted graph. However, existing planning algorithms for multi-floor environments modeled in this way …
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Signature change in spherical vacuum spacetimes
… region can lead to new universes by providing "wormholes" through to other Lorentzian universes. By this we mean that, if one follows "time-like" geodesic paths from a Lorentzian region into a Euclidean region, they bounce (instead of hitting a singularity) and can then pass through a second …
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Experimental and Modelign of Foam Physics in Porous Media
… sand production generates some high-permeability wormholes, which often present difficulties for applying follow-up processes to increase the recovery factor beyond that of CHOPS (Pan et al., 2013). The third objective is to investigate the viability of anionic surfactant sodium bis(2-ethylhexyl) …
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Study of reactive flow, ground deformation and real-time tomography with applications on CO₂ sequestration
… a network approach that models the formation of wormholes from reactive flow of high concentration carbonic acid in limestone is devised. In this model, the pore space is partitioned into two parts, the bigger subset of the pore network as a leading sub-network while the reminder of porosity …
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Aspects of Black Hole Physics: Scalar Sources, Holography and Gravitational Wave Emission
… hole mimickers, in particular boson stars and wormholes. We discuss the existence and the stability of boson stars in higher dimensions and boson stars built with multiple scalars. We compute tidal Love numbers for various mimickers and discuss how to distinguish black holes from their possible …
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An Exploration of AdS3 Gravity as a Holographic Theory
… operators. This model has eternal traversable wormholes supported by suitable boundary conditions on the matter fields. Within this construction, the field theory of boundary gravitons is used to compute the spectrum of gravitational fluctuations and in principle the gravitational contribution …
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Building a reliable and secure management framework for software-defined networks
… at a centralized SDN controller, it apprehends wormholes not only without requiring any particular location information but also without causing significant communication and coordination overhead. SWANS also countermeasures various false-positive and false-negative scenarios generated by the …
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A Novel Automatic History Matching Method and Upscaling Study of Cyclic Solvent Injection Process for Post-Chops Heavy Oil Reservoirs
… data. In addition, the location of the wormholes may affect the magnitude of capillary pressure employed in history matched cases. The CSI operational strategies in a typical western Canadian heavy oil post- CHOPS reservoir (M reservoir) were investigated by numerical simulation. The …
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A clean slate approach to secure wireless networking
… such as the following: man-in-the-middle, wormholes, dropping packets, Byzantine behaviors, disruption of timing events, presenting false topologies, etc. More importantly, this protocol suite obviates the need to identify all of the other types attacks that can potentially be carried out …
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Integrated optimization of hybrid steam-solvent injection in post-CHOPS reservoirs with wormhole networks and foamy oil behaviour under uncertainty
… both its in-situ generated open channels (i.e., wormholes) and induced foamy oil lead to a higher oil recovery than expected. Hybrid steam-solvent injection has been considered as the most effective recovery method for heavy oil reservoirs; however, the existence of wormhole networks makes it …
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Nitrate and Ammonium Transformation and Fate in Groundwater of an Agricultural Watershed: An Isotope and Geochemistry Approach
… when vegetation is inactive. The abundance of wormholes observed in an excavated test pit, suggests macro-porosity in the sediments aids the infiltration and contributes to the rapid transmission of the meteoric signal to the water table and thus accounting for the rapid shift in trends …