Relevant bibliographies by topics / Black hole - hydrodynamics / Dissertations / Theses
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Dissertations / Theses on the topic 'Black hole - hydrodynamics'

Author: Grafiati
Published: 14 March 2023

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1

Hansen, James Michael. "Applications of AdS-CFT to problems in black hole physics and hydrodynamics." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1930286641&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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2

ROITBERG, ALICE. "Gross-Pitaevskii hydrodynamics in Riemannian manifolds and application in Black Hole cosmology." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/404710.

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In questa tesi ci si propone di analizzare le implicazioni fisiche della geometria dello spazio ambiente nel contesto dei condensati di Bose-Einstein (BEC) e le possibili applicazioni nell’ambito dei modelli analogici della cosmologia dei buchi neri. A tal fine si deriva la formulazione idrodinamica dell'equazione di Gross-Pitaevskii (GPE) nel caso di una generica varietà Riemanniana e si osserva la comparsa di una nuova forza, che dipende essenzialmente da due parametri: la geometria della varietà e le derivate prime del profilo di densità. Si studiano le condizioni stazionarie in relazione a
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3

Rocha, João Pedro Mendes. "Numerical study of the tidal disruption of stors by the supermassive black note Sgr A* in the Galactic Center." Doctoral thesis, Universidade de Évora, 2019. http://hdl.handle.net/10174/25799.

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A Super Massive Black Hole (SMBH) with a mass of 4 106M⊙ lurks in the center of the Milky Way known as Sagittarius A* (Sgr A*). Its presence affects both the Galactic Center (GC) interstellar gas, of which the central molecular zone is an example, as well as the stellar system in which it resides. A direct effect of the presence of Sgr A* is the capture of objects, in particular stars, leaving a trace of of X-ray (soft and hard) and gamma-ray emissions. A secondary effect is the origin and powering of the Fermi Bubbles, large superbubbles extending 8 kpc above and below the GC. Their energ
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4

Beckmann, Ricarda. "From seed to supermassive : simulating the origin, evolution and impact of massive black holes." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:f866fb0f-f82f-44b5-b6e1-f075e5c0f765.

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First observed as early as redshift z = 7 and now thought to be found at the centre of every massive galaxy in the local Universe, the evolution history of supermassive black holes (SMBHs) spans over 13 billion years. In this thesis, the coevolution between SMBHs and their host galaxies is studied using a set of hydrodynamical simulations to isolate different components of the interaction between black holes and cosmic gas. The simulations range from black hole accretion in an idealised context to the impact of feedback in the cosmological simulations of the HORIZON suite. The origin of SMBHs
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5

MAINETTI, DEBORAH. "Whisper in the dark, scream in the light: stellar twists and shouts when facing black holes." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/198960.

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Al centro della maggior parte delle galassie risiedono buchi neri massicci quiescenti. Talvolta questi oggetti possono accrescere materiale dall’ambiente circostante e diventare attivi. Un contributo alla loro accensione è dato dalla distruzione mareale di stelle che gli orbitano intorno. Infatti, le stelle di un cluster nucleare galattico interagiscono stocasticamente una con l’altra, aumentando la probabilità per una di queste di essere scatterata abbastanza vicino al buco nero centrale da risentire in modo significativo della sua influenza mareale. Essenzialmente, se il pericentro della ste
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6

Cordeiro, Douglas Farias. "Simulação Gráfica de Buracos Negros utilizando Sistemas de Partículas." Universidade Federal de Uberlândia, 2009. https://repositorio.ufu.br/handle/123456789/12482.

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The application of Computer Graphics tools in the nature phenomena simulation have been presenting a series of proposals since its creation. Over the years this task has gained a characteristic trait that makes it closer to the reality, both visually as by the abstraction strategies used. However, the specific application of this Computer Science area for the astrophysical phenomena simulation remains as something restricted explored, although the Computer Graphics is considered as an important tool to aid the synthesis of satellite images and the film industry. Accordingly, this graphical sim
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7

Fukumura, Keigo. "Relativistic Accretion Flows onto Supermassive Black Holes: Shock Formation and Iron Fluorescent Emission Lines in Active Galactic Nuclei." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/fukumura/FukumuraK0505.pdf.

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One of the exciting discoveries from the recent X-ray spectroscopic studies of active galactic nuclei (AGNs) is the so called "relativistically-broadened iron fluorescent emission line" often detected in the hard X-ray spectra. It is generally believed to originate from the inner part of the accretion disk surrounding a supermassive black hole (BH) at the center. Although we have begun to obtain some physical insight regarding such emission lines supported by theoretical models (e.g., disk-corona model), exactly how and where the observed fluorescence may take place is still disputable. Here,
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8

Chantry, Loïc. "Relativistic Modeling of Multi-Component Astrophysical Jet : MHD flows around Kerr black holes." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO016/document.

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Les jets sont des phénomènes d’éjection collimatée de plasma magnétisé. Ces ph́énomènes liés à l’accrétion d’un disque sur un objet central, sont relativement répandus dans l’univers : les environnement des étoiles jeunes (objets Herbig-Haro, étoiles T Tauri), des binaires X, des sursauts gamma et les noyaux actifs de galaxies... Les jets extra-galactiques sont issus des trous noirs super-massifs au centre de galaxies telles que les quasars ou les radiogalaxies. Ils sont caractérisés par leur taille, leur puissance et la vitesse du plasma.Les jets extragalactiques sont étudiés dans de ce trava
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9

Lim, Hyun. "Dynamical Compact Objects in Numerical Relativity." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7729.

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The work of this dissertation will study various aspects of the dynamics of compact objects using numerical simulations.We consider BH dynamics within two modified or alternative theories of gravity. Within a family of Einstein-Maxwell-Dilaton-Axion theories, we find that the GW waveforms from binary black hole (BBH) mergers differ from the standard GW waveform prediction of GR for especially large axion values. For more astrophysically realistic (i.e. smaller) values, the differences become negligible and undetectable. Weestablish the existence of a well-posed initial value problem for a seco
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10

Bohórquez, William Eduardo Clavijo. "Influência da formação estelar versus buracos negros de nucleos ativos de galaxias (AGN) na evolução de ventos galácticos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-10102018-160124/.

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Ventos (em inglês outflows) de ampla abertura e larga escala sâo uma característica comum em galáxias ativas, como as galáxias Seyfert. Em sistemas como este, onde buracos negros supermassivos (em inglês super massive black holes, SMBHs) de núcleos galácticos ativos de galáxias (em inglês active galactic nuclei, AGN) coexistem com regiões de formação estelar (em inglês star forming, SF), nâo está claro das observações se o AGN SMBH ou o SF (ou ambos) são responsaveis pela indução desses ventos. Neste trabalho, estudamos como ambos podem influenciar a evolução da galáxia hospedeira e seus outfl
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11

Couch, Sean Michael. "Multidimensional multiscale dynamics of high-energy astrophysical flows." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1038.

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Astrophysical flows have an enormous dynamic range of relevant length scales. The physics occurring on the smallest scales often influences the physics of the largest scales, and vice versa. I present a detailed study of the multiscale and multidimensional behavior of three high-energy astrophysical flows: jet-driven supernovae, massive black hole accretion, and current-driven instabilities in gamma-ray burst external shocks. Both theory and observations of core-collapse supernovae indicate these events are not spherically-symmetric; however, the observations are often modeled assuming a s
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12

Rajesh, S. R. "Stability of Accretion Flows And Radiative-Hydrodynamics Around Rotating Black Holes." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2076.

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In the case of cold accretion disk, coupling between charge neutral gas and magnetic field is too weak such that the magneto-rotational instability will be less effective or even stop working. In such a situation it is of prime interest to investigate the pure hydrodynamic turbulence and transport phenomenon. As the Reynolds number increases, the relative importance of the non-linear term in the hydrodynamic equation increases and in the case of accretion disk where molecular viscosity is too small the Reynolds number is large enough for the non-linear term to bring new effects. We investigate
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13

Kulczycki, Wojciech. "Szacowanie masy w stacjonarnej hydrodynamice ogólnorelatywistycznej." Praca doktorska, 2019. https://ruj.uj.edu.pl/xmlui/handle/item/87979.

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14

Baumann, Mark Chapple. "Steady-state spherical accretion using smoothed particle hydrodynamics." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4396.

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Due to its adaptable nature in a broad range of problem domains, Smoothed Particle Hydrodynamics (SPH) is a popular numerical technique for computing solutions in astrophysics. This dissertation discusses the SPH technique and assesses its capabilities for reproducing steady-state spherically-symmetric accretion flow. The accretion scenario is of great interest for its applicability in a diverse array of astrophysical phenomena and, under certain assumptions, it also provides an accepted analytical solution against which the numerical method can be validated. After deriving the necessary eq
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15

Yates-Jones, PM. "Dynamics and radio properties of AGN jets in complex environments." Thesis, 2021. https://eprints.utas.edu.au/38129/1/Yates_Jones_whole_thesis.pdf.

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Active Galactic Nuclei (AGN) feedback is a key ingredient in galaxy formation and evolution. A large portion of this feedback is done by radio jets in the form of shock-heating and uplifting gas. Both theory and observations show that jets are affected by their environment; therefore to understand jet feedback, a detailed understanding of jet-environment interaction is required. Analytic and semi-analytic models can predict jet dynamics and large-scale morphology but necessitate simple assumptions about both the environment and jet stability. These assumptions are contrary to observations,whic
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16

Turner, RJ. "Dynamics and synchrotron emission from radio-loud AGN." Thesis, 2018. https://eprints.utas.edu.au/28364/1/Turner_whole_thesis.pdf.

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I present a new analytical model describing the dynamics and luminosity evolution of Fanaroff-Riley type I and II radio active galactic nuclei (AGN), and the transition between these classes. The galaxy environments of a volume-limited low redshift (0:03 ≤ z ≤ 0:1) sample of observed AGN are quantifed using a semi-analytic galaxy formation model, and the model applied to these objects to determine their distribution of jet powers and active lifetimes at the present epoch. This technique is refined for radio sources in the 3C survey with multi-frequency spectral coverage by including a constrai
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17

Favaro, María Elizabeth. "Análisis de supernovas asociadas a estallidos de radiación gamma." Bachelor's thesis, 2020. http://hdl.handle.net/11086/15292.

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Tesis (Lic. en Astronomía)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2020.<br>Desde hace dos décadas, se ha establecido una conexión entre estallidos de radiación gamma de larga duración (LGRB, cuya duración es mayor a 2 segundos) y supernovas (SNs) de tipo Ic-bl. Si bien, este vínculo ha sido fortalecido con el aumento de detecciones de estos eventos en los últimos años, aún quedan muchos interrogantes sobre su origen, características y mecanismos que los potencian. En el presente trabajo estudiamos una muestra de 5 SNs Ic-bl asociadas a LGRB.
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