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Dissertations / Theses on the topic 'Black holes'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Vika, Marina. "Supermassive black holes : the local supermassive black hole mass function." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2553.

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Over recent years there has been an increase of the number of secure supermassive black hole (SMBH) detections. These SMBH measurements have lead astronomers to establish well defined empirical relationships between the SMBH mass and some of the properties of the host galaxy. The number of galaxies with SMBH mass measurements is currently limited to about 100. One approach of expanding the study of the SMBH is to use the empirical relations for estimating M[subscript(bh)] for larger samples of galaxies. The investigation of the SMBH population (or SMBH mass function) for large sample of galaxi

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2

Chow, D. D. K. "Supergravity black holes." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597655.

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We study charged rotating black hole solutions of various supergravity theories, both ungauged and gauged, focusing on spacetime dimensions <i>D</i> = 4,5,6,7. These solutions may carry several independent angular momenta and U(1) charges, the precise number depending on the theory. We find asymptotically anti-de Sitter black holes in six-and seven-dimensional gauged supergravity. The six-dimensional solution has two independent angular momenta and one U(1) charge from an SU(2) gauge group. The seven-dimensional solution has three independent angular momenta and two equal U(1) charges from an

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3

Whisker, Richard. "Braneworld black holes." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2323/.

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The braneworld paradigm provides an interesting framework within which to explore the possibility that our Universe lives in a fundamentally higher dimensional space- time. In this thesis we investigate black holes in the Randall-Sundrum braneworld scenario. We begin with an overview of extra-dimensional physics, from the original proposal of Kaluza and Klein up to the modern braneworld picture of extra dimensions. A detailed description of braneworld gravity is given, with particular emphasis on its compatibility with experimental tests of gravity. We then move on to a discussion of static, s

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4

Mistry, Bina. "Braneworld black holes and black strings." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2242/.

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This thesis involves the study of strong and weak gravity phenomenology within the braneworld paradigm. We begin with a general overview of the hypothesised concept of extra spatial dimensions and explain why they are so interesting. Turning next to the topic of classical four-dimensional black holes, we discuss their formation via gravitational collapse and indicate some of the strong observational evidence of their existence. We then merge the two independent theories of extra dimensions and black holes together to form braneworld black holes. Focusing our attention on two distinct braneworl

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5

Zhu, Yucong. "The Bright Side of Black Holes: Radiation From Black Hole Accretion Disks." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17463143.

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An understanding of radiation is paramount for connecting observations of accretion disks with the theory of black holes. In this thesis, we explore via radiative transfer postprocessing calculations the observational signatures of black holes. We investigate disk spectra by analyzing general relativistic magnetohydrodynamic (GRMHD) simulations of accretion disks. For the most part there are no surprises -- the resulting GRMHD spectrum is very close to the analytic Novikov & Thorne (1973) prediction from decades past, except for a small modification in the case of spinning black holes, whic

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6

Khan, Abid, Vasileios Paschalidis, Milton Ruiz, and Stuart L. Shapiro. "Disks around merging binary black holes: From GW150914 to supermassive black holes." AMER PHYSICAL SOC, 2018. http://hdl.handle.net/10150/627161.

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We perform magnetohydrodynamic simulations in full general relativity of disk accretion onto nonspinning black hole binaries with mass ratio q = 29/36. We survey different disk models which differ in their scale height, total size and magnetic field to quantify the robustness of previous simulations on the initial disk model. Scaling our simulations to LIGO GW150914 we find that such systems could explain possible gravitational wave and electromagnetic counterparts such as the Fermi GBM hard x-ray signal reported 0.4 s after GW150915 ended. Scaling our simulations to supermassive binary black

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7

Shiiki, Noriko. "Solitons and black holes." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313504.

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8

Deeg, Dorothea. "Quantum Aspects of Black Holes." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-60243.

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9

Schulze, Andreas. "Demographics of supermassive black holes." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2011/5446/.

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Supermassive black holes are a fundamental component of the universe in general and of galaxies in particular. Almost every massive galaxy harbours a supermassive black hole (SMBH) in its center. Furthermore, there is a close connection between the growth of the SMBH and the evolution of its host galaxy, manifested in the relationship between the mass of the black hole and various properties of the galaxy's spheroid component, like its stellar velocity dispersion, luminosity or mass. Understanding this relationship and the growth of SMBHs is essential for our picture of galaxy formation and e

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10

Moore, Christopher James. "Gravitational waves : understanding black holes." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/257043.

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This thesis concerns the use of observations of gravitational waves as tools for astronomy and fundamental physics. Gravitational waves are small ripples in spacetime produced by rapidly accelerating masses; their existence has been predicted for almost 100 years, but the first direct evidence of their existence came only very recently with the announcement in February 2016 of the detection by the LIGO and VIRGO collaborations. Part I of this thesis presents an introduction to gravitational wave astronomy, including a detailed discussion of a wide range of gravitational wave sources, their sig

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11

Cervantes, Pedro. "Black Holes in Infinite Dimensions." Thesis, Uppsala universitet, Teoretisk fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-341732.

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The description of a black hole in the limit of very large number of spacetime dimensions D simplifies considerably. When D approaches infinity, the gravitational field lines of force are infinitely dispersed among the infite number of spacetime directions. This implies that outside the near-horizon region of the black hole the background spacetime will be flat, while the gravitational field will be strongly localized near the horizon. Thus, we can attempt to replace the black hole by a sphere cut off at the horizon in an empty background. In this project we attempt to obtain the physical cond

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12

Habouzit, Mélanie. "Formation of supermassive black holes." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066360/document.

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Des trous noirs supermassifs (TNs) de plusieurs millions de masses solaires occupent le centre de la plupart des galaxies proches. La découverte du TN Sagittarius A* au centre de notre galaxie, La Voie lactée, l'a confirmé. Pour autant, certaines galaxies semblent dépourvues de TNs (par exemple NGC205, M33), ou alors ne posséder un TN que de quelques milliers de masses solaires. D'autre part, des TNs dans leur forme la plus lumineuse, appelés quasars, dont la luminosité est plus importante que des centaines de fois celle d'une galaxie toute entière, ont été observés à très grand décalage spect

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13

Slezakova, Gabriela. "Geodesic Geometry of Black Holes." The University of Waikato, 2006. http://hdl.handle.net/10289/2659.

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The study of geodesics is of intrinsic significance in the study of the geometry of space-time. In this thesis null, space-like and time-like geodesics are studied in the case of the space-times of Schwarzschild, Reissner-Nordstrouml;m and Kerr black holes. These space-times have been investigated with varying degrees of thoroughness in many articles and some books. However, there are some significant gaps in these treatments and the central aim of this thesis is to fill these gaps where necessary. Moreover, the following topics are covered for the first time. 1. In Chapter 4 a thorough treatm

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14

MacMillan, Joseph. "Adiabatic growth of black holes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63333.pdf.

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15

Michaud, Guy 1971. "Two-dimensional dilation black holes." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22776.

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In this thesis, we study toy models of two-dimensional gravity. We first review two known models: the classical and quantum corrected CGHS models and the quantum corrected model of RST. These two models have black holes solutions with curvature singularities, similar to the Schwartzschild black hole. This singularity becomes naked in the RST model at a certain event during the evaporation. In the third chapter, we build a more general version with new quantum corrections beyond those presented in the RST model, which enable us to find a model without curvature singularities. We will also see t

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16

Parsons, James Duncan. "Black holes with a twist." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/846/.

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In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to offer a good opportunity to study closed string tachyon condensation, as there are tachyons in the winding sector even in superstring theory. We study extremal BTZ black holes, both M = O and M = J from a world sheet perspective. The string spectrum is calculated within bosonic string theory and tachyons are identied within the spectrum. The at space limit of the M = 0 black hole is considered and an extension to superstring theory is discussed. In the second half of the thesis we discus

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17

Mellor, Felicity Avril. "Black holes and quantum cosmology." Thesis, University of Newcastle Upon Tyne, 1990. http://hdl.handle.net/10443/682.

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The work of this thesis falls into two parts: a discussion of decoherence in quantum Kaluza-Klein theories and a study of some of the properties of general black hole metrics in de Sitter spacetime. Kaluza-Klein theories permit a variety of compactifications and arbitrary scales for the internal space. There must be no quantum interference between these different possibilities. In chapter one it is demonstrated that in the Salam-Sezgin compactification interference between differently scaled interenal spaces is suppressed. In chapter two new gravitational instantons are presented which are rel

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18

Wray, Andrew M. "Topological defects and black holes." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332341.

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19

Giammatteo, Massimiliano. "Quasinormal modes of black holes." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397532.

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20

Atkinson, John William. "Demography of supermassive black holes." Thesis, University of Hertfordshire, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397769.

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21

Hayward, Justin. "Black holes in two dimensions." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389846.

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22

Falls, Kevin. "Asymptotic safety and black holes." Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/45249/.

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We study the ultraviolet properties of quantum gravity and its consequences for black hole physics using the functional renormalisation group (RG). In particular we concentrate on the asymptotic safety scenario for quantum gravity put forward by S. Weinberg. This approach relies on the existence of an ultraviolet fixed point in the renormalisation group flow. In chapter 2 we review the functional renormalisation group formalism that is used in order to search for the existence of a fixed point with the properties required for asymptotic safety. Following this introduction, in chapter 3 we use

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23

Appels, Michael John. "Thermodynamics of accelerating black holes." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12737/.

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We address a long-standing problem of describing the thermodynamics of an accelerating black hole. We derive a standard first law of black hole thermo- dynamics, with the usual identification of entropy proportional to the area of the event horizon — even though the event horizon contains a conical singularity. We show how to generalise this result, formulating thermodynamics for black holes with varying conical deficits. We derive a new potential for the varying tension defects: the thermodynamic length, both for accelerating and static black holes. We discuss possible physical processes in w

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24

Procopio, Giovanni Paolo. "Black holes on the brane." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611130.

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25

Reall, Harvey Stephen. "Black holes, branes and cosmology." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621061.

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26

Gutowski, Jan Bernard. "Black holes and brane solitons." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620991.

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27

Westmoreland, Shawn Michael. "Optical black holes and solitons." Diss., Kansas State University, 2010. http://hdl.handle.net/2097/6910.

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Doctor of Philosophy<br>Department of Mathematics<br>Louis Crane<br>We exhibit a static, cylindrically symmetric, exact solution to the Euler-Heisenberg field equations (EHFE) and prove that its effective geometry contains (optical) black holes. It is conjectured that there are also soliton solutions to the EHFE which contain black hole geometries.

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28

Cunha, e. Mello Marina Machado. "Black holes in dynamical spacetimes." reponame:Repositório Institucional da UFABC, 2018.

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29

Garofalo, David A. G. "Magnetic fields around black holes." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8017.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Astronomy. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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30

Harun-or-Rashid, S. M. "Cosmological parameters and black holes." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/mat/fysii/vk/harun-or-rashid/.

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31

Musco, Ilia. "Formation of primordial black holes." Doctoral thesis, SISSA, 2006. http://hdl.handle.net/20.500.11767/4238.

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This thesis presents results from general relativistic numerical computations of primordial black-hole formation during the radiation-dominated era of the universe. Growing-mode perturbations are specified within the linear regime and their subsequent evolution is followed as they become nonlinear. We use a spherically symmetric Lagrangian code and study both super-critical perturbations, which go on to produce black holes, and sub-critical perturbations, for which the overdensity eventually disperses into the background medium. For super-critical perturbations, we revisit the results of

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32

O'Sullivan, Stephen Gerard. "Making better binary models and modeling distorted black holes using black hole perturbation theory." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99297.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>In this thesis, I discuss the application and development of black hole perturbation theory both from an observational standpoint via gravitational waves and also tidal distortions of black hole horizons. The promise of gravitational wave astronomy depends on our ability to accurately model gravitational wave signals from astrophysical sources. This requires large numbers of accurate theoretical template waveforms spanning large

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33

Nielsen, Alex. "Black Hole Horizons and Black Hole Thermodynamics." Thesis, University of Canterbury. Physics and Astronomy, 2007. http://hdl.handle.net/10092/1363.

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This work investigates how black holes can be described in terms of different definitions of horizons. Global definitions in terms of event horizons and Killing horizons are contrasted with local definitions in terms of trapping horizons and dynamical horizons. The discussion is framed in the context of the laws of black hole thermodynamics.

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34

Fanidakis, Nikolaos. "A new twist on black holes : the role of black hole spin in galaxy formation." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/765/.

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We study the coevolution of black holes (BHs) and their host galaxies through cosmic time. The calculation is embedded in the GALFORM semi-analytic model which simulates the formation and evolution of galaxies in a cold dark matter (CDM) universe. The BH and galaxy formation models are coupled: during the evolution of the host galaxy, hot and cold gas are added to the BH by flows triggered by halo gas cooling, disc instabilities and galaxy mergers. This builds up the mass and spin of the BH, and the resulting accretion power regulates gas cooling and subsequent star formation. Using the Blandf

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35

Park, Minkyu. "Black hole microstates with a new constituent." Kyoto University, 2018. http://hdl.handle.net/2433/232242.

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36

Lenzi, Michele. "Effective potentials for corpuscular black holes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13539/.

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L’approccio innovativo alla fisica dei buchi neri quantistici proposto da Dvali e Gomez, permette di trovare nuove soluzioni ad alcuni dei principali problemi dell’unione tra relatività generale e meccanica quantistica. In particolare, porta a un’interpretazione originale della geometria classica, che diventa un concetto emergente dalla descrizione della gravità attraverso uno stato quantistico di gravitoni con numero d’occupazione elevato. Queste idee sono la principale motivazione del nostro lavoro, che chiarisce alcuni aspetti delicati stabilendo un netto collegamento tra il modello quant

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37

Giorgi, Giacomo. "The thermodynamic theory of black holes." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16350/.

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Studiando le equazioni di Einstein-Maxwell si ricava la soluzione di Kerr-Newman che descrive il comportamento generale di un buco nero rotante e carico. Questa soluzione dipende da tre parametri m, a e Q che definiscono rispettivamente la massa, il momento angolare e la carica del buco nero. Per a=Q= 0 si ottiene la soluzione di Schwarzschild che presenta un orizzonte deglieventi in r= 2m. Per a= 0 si ottiene la soluzione di Reissner-Nordstrøm per buchi neri carichi e per Q= 0 la soluzione di Kerr per buchi neri rotanti. La termodinamica dei buchi neri è l’area di studio che cerca di

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38

Zucchini, Sara. "Primordial black holes in string inflation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17097/.

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In this thesis we consider the production of primordial black holes (PBH) in the context of single field inflation with the aim of describing a significant fraction of dark matter. In the models we consider, the inflaton is a string modulus and its potential is typical of type IIB fibre inflation. The potential presents a plateau at CMB scales and an extremely flat region on smaller scales. The background is analysed by solving the Friedmann's and the Klein-Gordon equations for the system. Perturbations are introduced through the usual Mukhanov-Sasaki equation for the gauge invariant curvatur

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39

Maccarrone, Heredia Alessandro. "Microscopic analysis of rotating black holes." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/395196.

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The main objective of this thesis is to understand from a microscopic point of view some of the characteristic phenomena of rotating black holes. The inclusion of rotation gives rise to physics that allows a more precise and detailed understanding of the microscopic string theory of black holes. In this thesis we focus on two models of particular interest: one is based on the D0-D6 system and the other on the D1-D5-P system. The former is interesting because, through its connection to M-theory, it yields a statistical-mechanics description of neutral black holes. The latter allows to have b

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Cebeci, Hakan. "Kerr Black Holes And Its Generalizations." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1006154/index.pdf.

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The scalar tensor theory of gravitation is constructed in D dimensions in all possible geometries of spacetime. In Riemannian geometry, theory of gravitation involves a spacetime metric g with a torsion-free, metric compatible connection structure. If the geometry is non-Riemannian, then the gauge theory of gravitation can be constructed with a spacetime metric g and a connection structure with torsion. In non-Riemannian theory, connections may be metric compatible or non-metric compatible. It is shown that theory of gravitation which involves non-metric compatible connection and torsion, can

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41

Capela, Fabio. "Black holes and the dark sector." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209310.

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This thesis is divided in two parts: the first part is dedicated to the study of black hole solutions in a theory of modified gravity, called massive gravity, that may be able to explain the actual stage of accelerated expansion of the Universe, while in the second part we focus on constraining primordial black holes as dark matter candidates.<p><p>In particular, during the first part we study the thermodynamical properties of specific black hole solutions in massive gravity. We conclude that such black hole solutions do not follow the second and third of law of thermodynamics, which may signa

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42

Harry, I. W. "Can we hear black holes collide?" Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55138/.

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The focus of this work is the attempt to detect gravitational waves emitted by compact binary coalescences (CBCs) using gravitational wave interferometers. We begin by reviewing the basic theory of gravitational waves and the methods for their detection, focusing on CBCs. We also briefly describe the laser interferometers that are being used to attempt to detect gravitational radiation. We describe in detail the search pipeline that has been used to search for gravitational waves emitted from CBCs in data taken by the LIGO and Virgo detectors. We present the latest results of the all-sky, all-

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Deegan, Patrick. "Accretion onto stellar mass black holes." Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/7831.

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I present work on the accretion onto stellar mass black holes in several scenarios. Due to dynamical friction stellar mass black holes are expected to form high density cusps in the inner parsec of our Galaxy. These compact remnants may be accreting cold dense gas present there, and give rise to potentially observable X-ray emission. I build a simple but detailed time-dependent model of such emission. Future observations of the distribution and orbits of the gas in the inner parsec of Sgr A* will put tighter constraints on the cusp of compact remnants. GRS 1915+105 is an LMXB, whose large orbi

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Daniels, D. R. "Quantum field theory near black holes." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636346.

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In Part I we investigated the phenomenon that photons propagating in curved space-time may, depending on their direction and polarisation, travel at speeds greater than the speed of light <I>c</I>. The explicit cases calculated for, were the Reissner Nordstrom and Kerr metrics. This led to a postulated Horizon Sum Rule and Polarisation Theorem for photons propagating in general black hole spacetimes. The effects of a purely electromagnetic background were also calculated on photon propagation, with an intriguing possible link with the conformal anomaly appearing. We argue that the 'faster than

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45

Ballantyne, D. R. "Ionized accretion discs around black holes." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596325.

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Many galaxies in the Universe show evidence of a supermassive black hole at their dynamical centre. About 10-20% of these galaxies also contain an extremely bright, point-like continuum source in their nuclear region. These luminous objects are called active galactic nuclei (AGN), and are thought to be powered by material accreting onto the central black hole. The infalling gas loses its energy and angular momentum by passing through an accretion disc. The disc then radiates away this energy, and it is this radiation that is observed as an AGN. When observed in the X-ray waveband AGN are found

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46

Turton, David J. "On black holes in string theory." Thesis, Queen Mary, University of London, 2011. http://qmro.qmul.ac.uk/xmlui/handle/123456789/2348.

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This thesis investigates black holes in string theory through string amplitudes and through gauge-gravity duality. The research presented in this thesis supports the claim that string theory is capable of a consistent quantum-mechanical description of black holes and develops techniques which may prove useful in testing this claim in new scenarios. The thesis comprises two parts. Part I describes novel disk amplitudes which derive the supergravity elds sourced by a D-brane with a travelling wave, and Part II describes free particle structures arising in a matrix model which is related through

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Schnittman, Jeremy David. "Radiation transport around Kerr black holes." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30362.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 201-212).<br>This Thesis describes the basic framework of a relativistic ray-tracing code for analyzing accretion processes around Kerr black holes. We begin in Chapter 1 with a brief historical summary of the major advances in black hole astrophysics over the past few decades. In Chapter 2 we present a detailed description o

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48

Rasheed, Dean Allan. "Internal symmetries, dualities and black holes." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624898.

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49

Kaus, Alexander. "Extremal charged brane world black holes." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610694.

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Holzegel, Gustav. "The stability problem for black holes." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612382.

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