Tesis sobre el tema "Astrophyics"
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Baring, Matthew Geoffrey. "Pair plasmas in astrophysics". Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279144.
Texto completoPrice, Daniel James. "Magnetic fields in astrophysics". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616258.
Texto completoReid, Giles Adrian. "Neutrino Oscillations in Astrophysics". Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/4935.
Texto completoLi, Chao Thorne Kip S. Thorne Kip S. Chen Yanbei Cooray Asantha. "Topics in theoretical astrophysics /". Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-10142008-155140.
Texto completoNoble, Patrick. "Stochastic processes in Astrophysics". Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10013.
Texto completoGao, Shu. "Energy transport mechanisms in astrophysics". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22758/.
Texto completoOppermann, Niels. "Signal inference in Galactic astrophysics". Diss., lmu, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-154689.
Texto completoHaddock, D. J. "Stellar masses and laboratory astrophysics". Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379945.
Texto completoJohnson, Colin Terence. "Fine structure transitions in astrophysics". Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317096.
Texto completoNicholson, Kerry Louise. "The astrophysics of LINER galaxies". Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298427.
Texto completoAN, JIN HYEOK. "Astrophysics from binary-lens microlensing". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1029254036.
Texto completoAn, Jin Hyeong. "Astrophysics from binary-lens microlensing". Columbus, Ohio : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1029254036.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxix, 171 p., also contains graphics. Includes abstract and vita. Advisor: Andrew P. Gould. Includes bibliographical references (p. 153-157).
An, Jin Hyeok. "Astrophysics from binary-lens microlensing". Columbus, Ohio : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1029254036.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxix, 171 p. Includes abstract and vita. Advisor: Andrew P. Gould, Dept. of Astronomy. Includes bibliographical references (p. 153-157).
MASCARETTI, CARLO. "Open problems in neutrino astrophysics". Doctoral thesis, Gran Sasso Science Institute, 2020. http://hdl.handle.net/20.500.12571/15041.
Texto completoZemp, Marcel. "Collisionless and collisional dynamics in astrophysics /". Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16801.
Texto completoMcGee, P. K. "Optical studies in high-energy astrophysics /". Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phm14485.pdf.
Texto completoMazur, Daniel Paul. "Nonperturbative quantum field theory in astrophysics". Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43255.
Texto completoDoherty, Daniel Thomas. "Experimental studies for explosive nuclear astrophysics". Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/18022.
Texto completoTunyasuvunakool, Saran. "Applications of numerical relativity beyond astrophysics". Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/262481.
Texto completoKulikovskiy, Vladimir. "Neutrino astrophysics with the ANTARES telescope". Paris 7, 2014. http://www.theses.fr/2014PA077050.
Texto completoThe ANTARES underwater neutrino telescope was successfully build and operating in the Mediterranean Sea. It has a capability to detect charged particles by the Cerenkov light using an array of the 875 photomultipliers. Ultra high energetic muon neutrinos produce muons with almost the same direction and energy as the origin neutrinos so their detection gives information about the astrophysical sources. The main goal of the telescope is the search for the cosmic source of the neutrinos. Supernovae remnants, active galactic nuclei and micro-quasars are candidates for point like neutrino sources, while the Galactic Center, the Galactic Plane and Fermi¬Bubbles are candidates for extended sources. The PhD thesis consists in studying the possible neutrino flux emitted by the two large Fermi Bubbles structures with the Antares telescope, on the basis of the data collected since 2008
Todd, Elizabeth. "Particle Astrophysics at the Galactic Center". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145121.
Texto completoAlmergren, Joachim. "Energy and Rotation in Relativistic Astrophysics". Doctoral thesis, SISSA, 2003. http://hdl.handle.net/20.500.11767/4245.
Texto completoZimmermann, Jens. "Statistical Learning in High Energy and Astrophysics". Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-43537.
Texto completoJaroschek, Claus. "Critical Kinetic Plasma Processes In Relativistic Astrophysics". Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-46601.
Texto completoKhiar, Benjamin. "Laboratory astrophysics with magnetized laser-produced plasmas". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066310/document.
Texto completoWe present in this work different configurations used as a mean to study astrophysically-relevant (by scaling) experiments using laser-produced plasmas and strong magnetic fields. This work is a contribution to the relatively recent field known as high energy density laboratory astrophysics (hedla). The theoretical and numerical framework used in this this work is first introduced with a detailed derivation of the magnetohydrodynamic (mhd) model for bi-temperature and resistive plasmas. The three-dimensional mhd code gorgon and the new physical modules implemented during this thesis are presented. The basic setup studied here involve one or several solid slabs being used as targets for a joule-class laser. The expanding plasma thus produced is embedded in magnetic fields of strengths up to 40 t. Depending on the orientation of the field relative to the target surface, we show that the resulting plasma dynamic, relatively well described by ideal mhd, is strongly modified by the presence of the field. The first topic treated is related to the production, when the field is perpendicular to the target surface, of super-sonic/alfvenic jets relevant in the context of astrophysical jets observed around young star objects (t tauri stars). When the field is oriented parallel to the surface, we show that the configuration results in the formation of thin unstable plasma slabs. We also studied the possibility to generate magnetized accretion shocks in the laboratory and we detail the 3d structure obtained in this case. Alongise the numerical work, we present for each case mentioned previously, new experimental results obtained by the collaboration on the elfie laser facility (luli)
Kennedy, Joan Loomis. "Representations of spectra in early British astrophysics". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365627.
Texto completoCastell, Pedro Ruiz. "Astronomy and astrophysics in Spain (1850-1914)". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432115.
Texto completoMumby-Croft, Paul David. "Tactic : A New Detector for Nuclear Astrophysics". Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507686.
Texto completoOgley, Richard Neil. "The astrophysics of energetic X-ray binaries". Thesis, Open University, 1998. http://oro.open.ac.uk/57881/.
Texto completoMoreno-Gelos, Quentin. "Non-relativistic collisionless shocks in Laboratory Astrophysics". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0427/document.
Texto completoCollisionless shocks are ubiquitous in the Universe, especially in the supernova remnants, and are formed via various plasma instabilities mainly depending on the speed and magnetization of plasma flows. The description of such shocks requires a kinetic approach, both analytical and numerical.In this thesis, we have studied, through Particle-In-Cell (PIC) simulations, the underlying processes by which instabilities compete with each other.We have shown that the reduction of the ion-to-electron mass ratio, often used in numerical simulations to accelerate the dynamics of shocks, can have strong consequences on the energy transfer between particles during the non-linear phase of instabilities.These instabilities, like the ionic acoustic instability (IAI) lead under certain conditions to the formation of electrostatic shocks, which can give rise to phase space holes formation, propagating in the downstream shock region, and accelerating the shock.The addition of an external magnetic field leads to different shock mediation, which can vary between the IAI to the slow or fast magneto-sonic waves as a function of the obliquity between the magnetic field and the shock normal.Furthermore, we have shown that the orientation of the magnetic field makes it possible to choose between a convex or concave dispersion of the plasma waves leading to the creation of precursor waves in the upstream or downstream shock regions.These magnetized shocks are correctly represented by the magnetohydrodynamic (MHD) model as long as they remain laminar and their potential in the downstream region is not large enough to reflect the particles of the upstream medium.We have shown that even for sub-critical shocks, a fraction of reflected ions, which cannot be modeled by the MHD, is sufficient for the growth of solitary waves upstream of the shock, leading to the acceleration of the latter, but not to a process of 'self-reformation' as for super-critical shocks.Although spatio-temporal scales are very different, scaling laws make possible the study of such phenomena in the laboratory. Our numerical studies have been done in the context of shock tubes that can be experimentally tested.As such, we propose in this thesis an experiment on the creation of magnetic islands, formed by the interaction of plasmas generated by the irradiation of laser targets bathed in an external magnetic field, leading to the formation of such shocks.Finally, we experimentally and numerically demonstrated the formation of collisionless electromagnetic shocks through the Weibel instability stimulated by theBiermann Battery instability, and leading to particle acceleration by the Fermi mechanism.This new type of experiment could explain the origin of cosmic radiation from supernova remnants
Higson, Edward John. "Bayesian methods and machine learning in astrophysics". Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289728.
Texto completoMingarelli, Chiara Maria Francesca. "Gravitational wave astrophysics with pulsar timing arrays". Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5117/.
Texto completoHernandez, David Michael. "Solving the N-body problem in astrophysics". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119107.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 299-307).
The astrophysical N-body problem describes N point masses interacting with each other through pairwise gravitational forces. A solution of this problem is frequently necessary in dynamical astronomy. In the collisional N-body problem, the relaxation time is small compared to the timescale we are interested in studying. Collisional N-body problems include open and globular clusters and protoplanetary disks during the stage, typically lasting hundreds of Myrs, when planetary embryos collide and merge. In the first part of this Thesis, I develop new symplectic integrators which provide a solution for the N-body problem. The integrators decompose the N-body problem into a superposition of two-body problems, which are integrable. Since they are symplectic, the integrators conserve all Poincaré invariants (the evolution is Hamiltonian). We used the integrators to compute the evolution of a globular cluster through core collapse up to 20 times faster than standard techniques. In the second part of this Thesis, I apply the results from the first part of the Thesis to planetary dynamics finding that for problems with hierarchical binaries (planets with moons, planetary systems with binary stars, etc.), the integrators are far more efficient than alternatives. I show numerically that a popular code is neither symplectic nor time-symmetric, and can yield incorrect three-body dynamics. I derive symplectic integrators in various coordinate systems with different Hamiltonian splittings and compare them through backward error analysis and tests of Pluto's orbital element evolution. The final part of this Thesis is concerned with time-symmetric and time-reversible integration in astrophysics, whether we are integrating the N-body problem or other ordinary differential equations. These integrators have been proposed as an alternative to symplectic integration. I show, again using backward error analysis, that such integrators are usually useful, but can behave worse than symplectic integrators. I find time-reversibility can be eliminated in some cases while good error behavior is still maintained.
by David Michael Hernandez.
Ph. D.
Feroz, Farhan. "Bayesian methods for astrophysics and particle physics". Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612370.
Texto completoHu, Yiming. "Novel inference methods for gravitational wave astrophysics". Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6441/.
Texto completoObrocka, Monika. "High-time resolution astrophysics using digital beamforming". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/hightime-resolution-astrophysics-using-digital-beamforming(5293d2b8-2054-4d67-9fca-435f7482be31).html.
Texto completoCullen, Jason. "Inverse compton scattering in high energy astrophysics". Connect to full text, 2001. http://hdl.handle.net/2123/849.
Texto completoTitle from title screen (viewed Apr. 23, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Research Centre for Theoretical Astrophysics & Theoretical Physics Group, School of Physics. Degree awarded 2002; thesis submitted 2001. Includes bibliography. Also available in print form.
Cullen, Jason Graham. "Inverse compton scattering in high energy astrophysics". Thesis, The University of Sydney, 2001. http://hdl.handle.net/2123/849.
Texto completoCullen, Jason Graham. "Inverse compton scattering in high energy astrophysics". University of Sydney. Physics, 2001. http://hdl.handle.net/2123/849.
Texto completoAddison, Eric. "Gravitational Wave Astrophysics with Compact Binary Systems". DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/2166.
Texto completoTABASSAM, UZMA. "A Pair Spectrometer for Nuclear Astrophysics Applications". Doctoral thesis, Università degli Studi di Camerino, 2012. http://hdl.handle.net/11581/401785.
Texto completoPety, Jérôme. "Caractériser le milieu interstellaire : un clé pour comprendre l'Univers". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00726959.
Texto completoChaulagain, Uddhab Prasad. "Radiative shocks : experiments, modelling and links to astrophysics". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066734.
Texto completoRadiative shocks are strong shocks which are characterized by a plasma at high temperatures emitting an important fraction of its energy as radiation. Radiative shocks are found in many astrophysical systems, including stellar accretion shocks, supernovae remnants, jet driven shocks, etc. Recently, radiative shocks have also been produced experimentally using high energy lasers. Thus opening the way to laboratory astrophysics studies of these universal phenomena.In this thesis we discuss the results of an experiment performed on the Prague Asterix Laser System facility. Shocks are generated by focusing the PALS Infrared laser beam on millimetre-scale targets filled with xenon gas at low pressure. The shock that is generated then propagates in the gas with a sufficiently high velocity such that the shock is in a radiative flux dominated regime. We used different diagnostics to characterize these shocks. The two main ones include a radiography of the whole shock structure using sub-nanosecond Zn X-ray laser at 21.2 nm, which is able to penetrate the dense post-shock layer, and a space-and-time resolved plasma self-emission using high speed diodes.The experimental results show, for the first time, an unambiguous shock structure which includes both the post-shock and the precursor, and we also obtained multiple shock velocity measurements from the different diagnostics. The experimental results are compared to simulations, and show good agreement with the numerical results
Grassi, Anna. "Collisionless shocks in the context of Laboratory Astrophysics". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066483/document.
Texto completoThe work presented in this thesis belongs to the general framework of Laboratory Astrophysics. We address various aspects of the physics of collisionless shocks developing in the presence of relativistic plasma flows, in configurations of interest for the astrophysical and the laser-plasma interaction (LPI) communities. The approach used throughout this thesis relied on both analytical modeling and high-performance kinetic simulations, a central tool to describe LPI processes as well as the non-linear physics behind shock formation. The PIC code SMILEI has been widely used and developed during this work. Three physical configurations are studied. First we consider the Weibel instability driven by two counter-streaming electron beams aligned with an external magnetic field. The linear and non-linear phases are explained using theoretical models confirmed by simulations.Then the generation of non-collisional shocks during the interaction of two relativistic plasma pairs is studied in the presence of a perpendicular magnetic field. We focus on the comparison of theoretical predictions for macroscopic variables with the simulation results, as well as on the definition and measurement of the shock formation time, all of which are of great importance for future experiments.Finally, we proposed a scheme to produce, in the laboratory, the ion-Weibel-instability with the use of an ultra-high-intensity laser. The produced flows are faster and denser than in current experiments, leading to a larger growth rate and stronger magnetic fields. These results are important for the LPI at very high intensity
Nilsson, Ulf. "Dynamical systems in cosmology and astrophysics /Ulf Nilsson". Stockholm : Stockholms Universitet, 1998. http://www.gbv.de/dms/goettingen/254604390.pdf.
Texto completoMargueron, J. "Modélisation microscopique pour l'astrophysique Microscopic modeling for astrophysics". Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00940921.
Texto completoPowell, Andrew James. "The cosmology and astrophysics of axion-like particles". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:bbbb3cbc-a0ba-4024-86b0-c720d8104270.
Texto completoDarg, Daniel W. "Pattern recognition in astrophysics and the anthropic principle". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:4cb9e1d5-d9d9-4993-8991-f43882d70016.
Texto completoBanerjee, Oindree. "Studies in particle astrophysics with the ANITA experiment". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532097132391735.
Texto completoKishimoto, Chad T. "Falling through spacetime four studies in neutrino astrophysics /". Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3355072.
Texto completoTitle from first page of PDF file (viewed June 10, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.