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.
Results
Showing 1 to 20 of 42 for “"Gravitational Collapse"”.
-
Electromagnetism in Gravitational Collapse
A numerical approach to including electromagnetism with general relativity is developed using GRAXI as a starting point. We develop a mathematical model describing electromagnetism coupled to a scalar field in an evolving axisymmetric spacetime. As there are numerous formulations of …
-
Cylindrically symmetric models of gravitational collapse
… of generalising the Oppenheimer-Snyder model of gravitational collapse to the cylindrically symmetric case The second problem is an analysis of cylindncally symmetric spacetimes with self-similarity modelling gravitational collapse The field equations and regularity conditions are examined …
-
Gravitational collapse and the information loss problem
This thesis is intended to critically review the standard black holes. In this thesis, we used the intractability of the black hole Information loss problem and the current crisis stirred up by the black hole Firewall paradox to support the argument that nature is better off without black holes.
-
Black Spaghetti: A Numerical Model of Gravitational Collapse in 4 + 1 Spacetime
<p>We investigate spherically-symmetric gravitational collapse in the presence of a single "large" extra dimension through the use of analytical and numerical techniques. This has bearing on higher-dimensional ideas concerning hypothetical objects called "black strings," or black holes extending …
-
Naked singularities in self-similar gravitational collapse: Stability properties of the Cauchy horizon
… 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 spacetimes which contain naked …
-
Gravitational collapse, compact objects and gravitational waves in General Relativity and modified gravity
… upgraded to advanced status GW150914, the first gravitational wave signal from the inspiral and merger of two black holes was detected. The following consistent detections (9 further black hole binaries and one neutron star system) and the introduction of the European interferometer Virgo, as …
-
Stability and gravitational collapse in extended theories of gravity: from singularities to bouncing scenarios
Einstein theory of General Relativity was well adapted and accepted until limitations in the form of an unexplained form of energy, referred today as Dark Energy, were observed. For this reason, modifications to the standard Theory of General Relativity were proposed: the so-called f(R) theories. …
-
Analysis of tidal dynamics of binary neutron stars and properties of gravitational collapse beyond general relativity
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
-
Properties of Neutron Star Critical Collapses
Critical phenomena in gravitational collapse opened a new mathematical vista into the theory of general relativity and may ultimately entail fundamental physical implication in the astrophysical realm, especially in gravitational collapse scenarios. However, at present, the dynamics of critical …
-
Global Positioning System in Curved Space-Time and Other Applications of General Relativity
… are worked out. These are the study of the gravitational collapse of stars and the dynamical evolution of a three-dimensional Einstein-Klein-Gordon field.
-
Heavy neutrino matter at finite temperature
… a system of massive fermions which interact only gravitationally, the phase transition that is associated with gravitational collapse. It is shown that by cooling a non-degenerate gas of massive neutrinos below some critical temperature, a condensed phase emerges, consisting of quasi-degenerate …
-
A comparison of the HI and CO velocity dispersions of nearby galaxies
… the stability of galactic disks against gravitational collapse to form stars, in some star formation recipes, in studies of gas dynamics, and to determine how much turbulence there is in the interstellar medium. Atomic hydrogen (HI) dispersions have been used in the studies of star …
-
Contributions to the Study of Lithospheric Deformation and Seismicity in Stable Continental Regions
… topographic data was used to calculate the gravitational potential energy, and in turn the body stress and deviatoric stress for the region. This study also investigated how this deviatoric stress (or deviatoric strain) can be more accurately calculated on a spherical rather than a flat …
-
Asymptotically Safe Gravity: from spacetime foliation to cosmology
… a more fundamental quantum theory for the gravitational interaction. However, as it is well known, the quantization of General Relativity leads to a (perturbatively) non-renormalizable theory. The Asymptotic Safety scenario for Quantum Gravity provides a natural mechanism for constructing a …
-
Colapso gravitacional de fluido perfeito em espaços-tempos circularmente simétricos com auto-similaridade cinemática
… is found that some of these solutions represent gravitational collapse and the final state of the collapse can be either a black hole or a null singularity. It is also shown that one solution can have two different kinds of kinematic self-similarity. At last, linear perturbations of homothetic …
-
Oppenheimer-Snyder Collapse in the BSSN Formalism
… of complicated scenarios. Oppenheimer-Snyder collapse, an exact solution for the gravitational collapse of a uniform, pressure-less ball of dust into a black hole, provides valuable insight into the collapse of realistic mass distributions such as stars. Early numerical relativity simulations …
-
Fermion Quantum Field Theory In Black-hole Spacetimes
… spacetimes is an acute one. The study of gravitational collapse necessitates the need of such. In this dissertation, we construct the theory of free fermions living on the static Schwarzschild black-hole and the rotating Kerr black-hole. The construction capitalises upon the fact that both …
-
Approaching the Singularity in Gowdy Universes
… is known that cylindrically symmetric dust can collapse to form a naked singularity. Since Gowdy universes comprise gravitational waves that are locally cylindrically symmetric, perhaps these waves can collapse onto a symmetry axis and create a naked singularity. It is known that in the case of …
-
Propagation of molecular outflows into inhomogeneous media
… mass-ejection phenomena created during the gravitational collapse of dense cores are thought to be responsible for the molecular outflows that are observed in molecular clouds. Interactions between these molecular outflows and the inhomogeneous molecular clouds they encounter may cause …
-
Circumstellar environments around the youngest protostars: interferometric observations and modeling
… Astronomy. Protostars form through gravitational collapse inside their natal envelopes, and these circumstellar envelopes contain valuable information about the physical processes of star formation. In this thesis, both molecular lines and dust continuum are utilized to investigate …
Page 1 of 3