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Dissertations / Theses on the topic 'Relativistic quantum theory'

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Published: 4 June 2021
Last updated: 25 July 2024

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1

Palmer, Matthew. "Relativistic quantum information theory and quantum reference frames." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/9891.

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This thesis is a compilation of research in relativistic quantum information theory, and research in quantum reference frames. The research in the former category provides a fundamental construction of quantum information theory of localised qubits in curved spacetimes. For example, this concerns quantum experiments on free-space photons and electrons in the vicinity of the Earth. From field theory a description of localised qubits that traverse classical trajectories in curved spacetimes is obtained, for photons and massive spin-1/2 fermions. The equations governing the evolution of the two-d
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2

Ruschhaupt, Andreas. "A relativistic extension of event enhanced quantum theory." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96395864X.

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3

Wallace, David. "Issues in the foundations of relativistic quantum theory." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270178.

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4

Somaroo, Shyamal Sewlal. "Applications of the geometric algebra to relativistic quantum theory." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627593.

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5

Tagliazucchi, Matteo. "Renormalization in non-relativistic quantum mechanics." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21030/.

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A problem of non-relativistic quantum mechanics solved using regularization and renormalization techniques is presented in this thesis. After a general introduction of these techniques, they are applied to a problem in classical electromagnetism and to the bound state of a single quantum particle subjected to a two-dimensional delta-function potential, that is divergent if computed naively solving directly the Schroedinger equation or using the theory of propagators. The regularization techniques used are the cutoff regularization and the dimensional one and they both leads to the same outcome
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6

Skaane, Haakon. "Relativistic quantum theory and its applications to atoms and molecules." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267921.

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7

Al-Naseri, Haidar. "Quantum kinetic relativistic theory of linearized waves in magnetized plasmas." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-150292.

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In this work we have studied linear wave propagation in magnetized plasmas using a fully relativistic kinetic equation of spin-1/2 particles in the long scale approximation. The linearized kinetic equation is very long and complicated, hence we worked with restricted geometries in order to simplify the calculations. The dispersion relation of the relativistic model was calculated and compared with a dispersion relation from a previous work at the semi-relativistic limit. Moreover, a new mode was discovered that survives in the zero temperature limit. The origin of the mode in the kinetic equat
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8

Almoukhalalati, Adel. "Applications of variational perturbation theory in relativistic molecular quantum mechanics." Toulouse 3, 2016. http://www.theses.fr/2016TOU30172.

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Le père même de la mécanique quantique relativiste P. A. M. Dirac a prédit que la version plus réaliste de la mécanique quant ique qu'il a misen place n'offrirait pas beaucoup plus par rapport à la formulation non relativiste de la mécanique quantique lorsqu'il est appliqué à des systèmes atomiques et moléculaires ordinaires. Lorsque la théorie quantique relativiste avait environ 40 années, les gens avaient commencé à recogenize à quel point les effets relativistes peuvent être même pour l'étude des systèmes atomiques et moléculaires. Les effets relativistes se manifestent par la contraction d
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9

Bird, Christopher Shane. "Infrared regularization in relativistic chiral perturbation theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://hdl.handle.net/1828/1062.

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Chiral perturbation theory is a useful tool in the study of low energy reactions involving light particles. However the inclusion of heavy particles in chiral perturbation theory results in large contributions from loop diagrams which violate the standard power counting scheme. We review two methods, referred to as heavy baryon chiral perturbation theory and infrared regularization, which remove the high energy effects of the heavy particles and which therefore do not violate the power counting scheme. We then use these two methods to calculate the amplitude for pion photoproduction to four
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10

Aiello, Gordon J. "An application of the theory of moments to Euclidean relativistic quantum mechanical scattering." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5902.

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One recipe for mathematically formulating a relativistic quantum mechanical scattering theory utilizes a two-Hilbert space approach, denoted by $\mathcal{H}$ and $\mathcal{H}_{0}$, upon each of which a unitary representation of the Poincaré Lie group is given. Physically speaking, $\mathcal{H}$ models a complicated interacting system of particles one wishes to understand, and $\mathcal{H}_{0}$ an associated simpler (i.e., free/noninteracting) structure one uses to construct 'asymptotic boundary conditions" on so-called scattering states in $\mathcal{H}$. Simply put, $\mathcal{H}_{0}$ is an att
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11

Davis, John E. "Application of the Schwinger closed time-path method to relativistic quantum field theory /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487694389393565.

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12

Mondal, Ritwik. "Relativistic theory of laser-induced magnetization dynamics." Doctoral thesis, Uppsala universitet, Materialteori, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-315247.

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Ultrafast dynamical processes in magnetic systems have become the subject of intense research during the last two decades, initiated by the pioneering discovery of femtosecond laser-induced demagnetization in nickel. In this thesis, we develop theory for fast and ultrafast magnetization dynamics. In particular, we build relativistic theory to explain the magnetization dynamics observed at short timescales in pump-probe magneto-optical experiments and compute from first-principles the coherent laser-induced magnetization. In the developed relativistic theory, we start from the fundamental Dirac
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13

Burimova, Anastasia. "Spectral and angular distributions of synchrotron radiation in quantum theory." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21032015-220522/.

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In the framework of quantum theory the characteristics of synchrotron radiation (SR) are considered. In order to simplify theoretical description the process of radiation is restricted to single-photon emission. For arbitrary quantum transitions the spectral-angular distributions of SR power are given in exact analytical form. Scalar particles (bosons) and particles with spin $\\hbar/2$ (electrons) are treated separately. Special attention is given to the particular transitions, namely, to the transitions to first excited and ground states. It is shown that the components of linear polarizatio
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14

Stokley, Martin. "An investigation into particle and field ontologies for relativistic scalar fields in de Broglie-Bohm type theories." Thesis, University of Portsmouth, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343394.

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15

Mendonça, Hudson Kazuo Teramoto. "Quebra de supersimetria em 2+1-dimensões." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-173941/.

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Nesse trabalho discutimos alguns aspectos da teoria quântica de campos que nos levam a formulação do potencial efetivo em teorias supersimétricas. O enfoque é dado as técnicas para análise da quebra de supersimetria em 2 + 1-dimensões. São discutidas as condições sobre o potencial efetivo de teorias supersimetrias para que ocorra ou não quebra de supersimetria. O potencial efetivo do modelo Wess-Zumino em 2+1-dimensões é calculado até a aproximação de 2-laços no formalismo de componentes e supercampos e até essa ordem não foi encontrado quebra de supersimetria.<br>In this work we discuss some
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16

Sharkey, Keeper Layne. "Very Accurate Quantum Mechanical Non-Relativistic Spectra Calculations of Small Atoms & Molecules Employing All-Particle Explicitly Correlated Gaussian Basis Functions." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560835.

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Due to the fast increasing capabilities of modern computers it is now feasible to calculate spectra of small atom and molecules with the greater level of accuracy than high-resolution measurements. The mathematical algorithms developed and implemented on high performance supercomputers for the quantum mechanical calculations are directly derived from the first principles of quantum mechanics. The codes developed are primarily used to verify, refine, and predict the energies associated within a given system and given angular momentum state of interest. The Hamiltonian operator used to determine
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17

Fukuda, Masahiro. "Theoretical Studies of Quantum Electrodynamics for Local Picture of Electron Spin and Time-evolution Simulation Method of Operators." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215962.

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18

Van, Rooy Milton William. "Locating the inner edge of a neutron star crust." Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5151.

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Thesis (MSc (Physics))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The overall goal of this project is to study neutron star properties and locate the transition density from the core to the crust using fifteen parameter sets of the effective Skyrme nucleon-nucleon interaction within a method called the dynamical method. Although another approach used to describe nucleon-nucleon interactions called the modified Gogny interaction is briefly discussed in this work, along with a second method for locating the transition density called the thermodynamical method, results using thi
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19

Aldair, Misael Wilken. "Shedding X-rays on molecules through the lenses of relativistic electronic structure theory." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR043.

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Cette thèse vise à étudier la structure électronique des actinides au moyen de méthodes de chimie quantique relativiste ab initio, avec une emphase particulière sur les observables spectroscopiques de l'unité uranyle (UO22+). Considérant le rôle central de cette unité en chimie des solides et en milieux aqueux et organique, ainsi que les avancées récentes dans les installations de rayonnement synchrotron, notre étude repose sur l'évaluation de l'interaction des photons de rayons X avec l'unité uranyle dans des degrés de complexité variés, allant des molécules aux solides cristallins.Tout d'abo
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20

Ibnouhsein, Mohamed Issam. "Quantum correlations and causal structures." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112426/document.

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Les travaux récents en fondements de la théorie quantique (des champs) et en information quantique relativiste tentent de mieux comprendre les effets des contraintes de causalité imposées aux opérations physiques sur la structure des corrélations quantiques. Le premier chapitre de cette thèse est consacré à l'étude des implications conceptuelles de la non-localité quantique, notion qui englobe celle d'intrication dans un sens précis. Nous détaillons comment les récentes approches informationnelles tentent de saisir la structure des corrélations non-locales, ainsi que les questions que ces dern
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21

Sonnenberg, Jason Louis. "Structure and reactivity studies of environmentally relevant actinide-containing species using relativistic density functional theory." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124308219.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from second page of PDF file. Document formatted into pages; contains xxiii, 151 p.; also includes graphics (some col.). Includes bibliographical references (p. 140-151). Available online via OhioLINK's ETD Center
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22

Lehum, André Carlos. "Quebra de simetria de calibre no modelo de Chern-Simons supersimétrico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-09052008-102010/.

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Através do formalismo de supercampos, estudamos as propriedades ultravioletas da eletrodinâmica quântica supersimétrica no espaço-tempo tridimensional. Mostramos que esta teoria é finita em todas as ordens de perturbação num calibre particular. Também apresentamos uma análise perturbativa do modelo de Chern-Simons supersimétrico acoplado a um supercampo escalar complexo. Com isso, estudamos a quebra da simetria de calibre U(1) e calculamos as primeiras correções quânticas à ação efetiva na fase quebrada. Mostramos que a renormalização da equação de gap é suficiente para assegurar a renormaliza
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23

Lapitski, Denis. "Development of the Quantum Lattice Boltzmann method for simulation of quantum electrodynamics with applications to graphene." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e89cd11b-da2c-4c34-be9f-7b3d711e2e64.

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We investigate the simulations of the the Schrödinger equation using the onedimensional quantum lattice Boltzmann (QLB) scheme and the irregular behaviour of solution. We isolate error due to approximation of the Schrödinger solution with the non-relativistic limit of the Dirac equation and numerical error in solving the Dirac equation. Detailed analysis of the original scheme showed it to be first order accurate. By discretizing the Dirac equation consistently on both sides we derive a second order accurate QLB scheme with the same evolution algorithm as the original and requiring only a one-
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24

Assirati, João Luis Meloni. "Quantização covariante de sistemas mecânicos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-01072010-130800/.

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Estudamos as restrições impostas pelo princípio da covariância sobre o procedimento de quantização em espaços planos e curvos. Mostramos que o conjunto de todas as quantizações covariantes em espaços planos em coordenadas retangulares é composto de ordenamentos de operadores de posição e momento e exibimos uma parametrização funcional deste conjunto. Deduzimos regras para a quantização covariante em espaços planos em coordenadas gerais. Generalizamos estas quantizações para espaços curvos e mostramos que nestes espaços, além da ambiguidade de ordenamento, surge uma nova ambiguidade relacionada
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25

Malbouisson, Jorge Mario Carvalho. "Estudo Sobre o Limite Não Relativístico em Teorias de Campos em 2 + 1 Dimensões." Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/43/43132/tde-24022014-111446/.

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Nesta tese, o limite não re1ativistico em teorias quânticas de campos em 2+1 dimensões é discutido1 perturbativamente, através da introdução de um corte intermediário que permite 0 cálculo de.expansão /P/m das amplitudes quânticas. especificando a origem, no espaço dos estados intermediários, de cada uma. das contribuições. Este procedimento é aplicado à teoria 4 e um esquema de redução a nível das amplitudes, que identifica a contribuição do setor de baixas energias com 0 resultado da teoria não re1ativistica, é proposto. Quando aplicado á teoria de Chern-Simons escalar, este procedimento su
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26

Lascio, Eduardo Roberto De. "Setor eletrofraco fortemente acoplado na escala TeV: teoria e fenomenologia no LHC." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02052012-101039/.

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Esta tese apresenta estudos sobre uma possível extensão do Modelo Padrão, suas características teóricas e fenomenológicas. São estudados aspectos do Modelo Padrão relevantes para a análise do setor eletrofraco. Motivado pela solução do problema da hierarquia, é introduzido um espaço de cinco dimensões, com a quinta dimensão curva e compactificada em orbifold. Neste espaço são analisados campos escalares, espinoriais e vetoriais, exibindo modos excitados, os chamados modos de Kaluza-Klein. É incluída uma quarta geração de férmions, sendo então possível obter um setor eletrofraco fortemente acop
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27

Henriksson, Johan. "Molecular Quadratic Response Properties with Inclusion of Relativity." Doctoral thesis, Linköping : Department of Physics, Chemistry and Biology, Linköping University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11035.

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28

Sulzer, David. "Modélisation des interactions faibles en théorie de la fonctionnelle de la densité." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00945896.

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Les descriptions des interactions faibles et notamment de la dispersion représentent un problème majeur pour la théorie de la fonctionnelle de la densité. En effet, le caractère fortement local des fonctionnelles rend problématique la description des interactions à longue-portée. Aussi, plusieurs stratégies sont envisagées: des corrections des fonctionnelles existantes ou une introduction de méthodes post-Hartree-Fock par séparation de portée. Des résultats dans les deux cas sont exposés. Tout d'abord, la méthodologie hybride est appliquée à des dimères de métaux de transition (Cr2, Mn2 et Zn2
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29

Salehi, Kasmaei Babak. "NONEQUILIBRIUM PROBES OF THE QUARK-GLUON PLASMA." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1627035862984205.

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30

Germano, Guilherme Rocha. "Representações irredutíveis unitárias do grupo de Poincaré." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-08122016-160042/.

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A teoria de representações de grupos topológicos Hausdorff, localmente compactos e separáveis em espaços de Hilbert separáveis é introduzida, especificada para grupos compactos e comutativos e são obtidas realizações explicitas das representações finitas irredutíveis de $SU(2)$, $SO(3)$, SL(2,C) e $SO(1,3)^{\\uparrow}$. A teoria das representações induzidas é então apresentada e, depois de feita a conexão entre teorias quântico relativísticas livres no espaço plano de Minkowski e representações unitárias irredutíveis de $R^4 times$ SL(2,C), aplicada para obter tais representações e realiza
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31

Paquier, Julien. "Théorie de la fonctionnelle de la densité relativiste à séparation de portée." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUS059.

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Cette thèse de doctorat constitue une contribution à l’extension relativiste de la théorie de la fonctionnelle de la densité à séparation de portée, en combinant un calcul de fonction d’onde relativiste à quatre composantes pour la contribution de longue portée avec une fonctionnelle de la densité relativiste à courte portée complémentaire, basée sur l’Hamiltonien Dirac-Coulomb ou Dirac-Coulomb-Breit sans paire. Nous avons étudié les propriétés du gaz d’électrons homogène relativiste dans l’approximation sans paire pour développer des fonctionnelles de la densité d’échange-corrélation relativi
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32

Baldiotti, Mário César. ""Estados quânticos de um elétron em um campo magnético uniforme"." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-10062003-015716/.

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Neste trabalho, apresentamos um método que permite explicitar a arbitrariedade contida nas soluções das equações de onda relativísticas, na presença de certos tipos de campos eletromagnéticos externos. Esta arbitrariedade está relacionada com a existência de uma transformação, com a qual podemos reduzir o número de variáveis presentes na equação original. Através desta transformação, criamos uma representação, a qual permite obter novos conjuntos de soluções exatas e construir a função de evolução para a equação de Klein-Gordon. Como resultado, apresentamos novos conjuntos de soluções, estacio
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33

Taillebois, Emile Raymond Ferreira. "Traço parcial em sistemas relativísticos: uma nova visão." Universidade Federal de Goiás, 2013. http://repositorio.bc.ufg.br/tede/handle/tede/7484.

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Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2017-07-05T20:29:06Z No. of bitstreams: 2 Dissertação - Emile Raymond Ferreira Taillebois - 2013.pdf: 1511356 bytes, checksum: 65cfae075ab1d008ea3249e5ffc19da9 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Cláudia Bueno (claudiamoura18@gmail.com) on 2017-07-07T19:11:05Z (GMT) No. of bitstreams: 2 Dissertação - Emile Raymond Ferreira Taillebois - 2013.pdf: 1511356 bytes, checksum: 65cfae075ab1d008ea3249e5ffc19da9 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e
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AL, SALEH-MAHROUSSEH SALOUA. "Calcul relativiste, en electrodynamique quantique, de la diffusion compton sur un electron lie." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF21098.

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Pour expliquer le deplacement et l'elargissement du pic compton,lorsque l'energie du photon est voisine de l'energie de liaison de l'electron, il est necessaire d'introduire non seulement la liaison et le mouvement de l'electron, mais aussi le recul du mnoyau. On donne un calcul relativiste de la valeur quadratique moyenne de l'impulsion de l'electron et une expression generale des fonctions d'onde radiales. Pour le calcul analytique covariant de l'element de matrice ou utilise un propagateur pour un electron lie dans le schema de furry et determine la secton efficace, sans aucune integration
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35

Diaz, Alonso Joaquin. "Première partie: analyse quantique relativiste de la matière denseDeuxième partie : quelques problèmes en physique mathématique." Paris 7, 1985. http://www.theses.fr/1985PA077030.

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36

Jabbour, Michael. "Bosonic systems in quantum information theory: Gaussian-dilatable channels, passive states, and beyond." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/272099.

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The symplectic formalism applied to the phase-space representation of bosonic quantum systems provides us with a powerful mathematical tool for the characterisation of Gaussian states and transformations. As a consequence, quantum information protocols involving the latter are very well understood from a theoretical point of view. Nevertheless, it has become clear in recent years that the use of non-Gaussian resources is necessary in order to perform various crucial information-processing tasks. An illustration of this fact can for instance be found in situations where a Gaussian no-go theorem
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37

Payet, Jimmy. "États fondamentaux dans l'approximation quasi-classique pour des modèles d'électrodynamique quantique non relativiste." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0045.

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Dans cette thèse, on s'intéresse à des modèles de théorie quantique des champs décrivant les interactions entre une particule non relativiste et un champ de radiation quantifié. En particulier, on s'intéresse à la minimisation de l'énergie quasi-classique des modèles considérés, c'est-à-dire l'énergie du système lorsque le champ se trouve dans un état cohérent. Un premier résultat concerne le modèle spin-boson, c'est un modèle simple (mais non trivial) où la particule non relativiste est décrite par un système de dimension finie et est couplée linéairement à un champ quantifié scalaire. On obt
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38

Bouvier, Patrick. "Contributions à l’étude de l’effet Hawking pour des modèles en interaction." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112356/document.

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L'effet Hawking prédit, dans un espace-temps décrivant l'effondrement d'une étoile à symétrie sphérique vers un trou noir de Schwarzschild, qu'un observateur statique, situé à l'infini, observera un flux thermal de particules quantiques à la température de Hawking. La première démonstration mathématique de l'effet Hawking pour des champs quantiques libres est due à Bachelot, dont le travail sur les champs de Klein-Gordon a été ensuite étendu aux champs de Dirac, d'abord par Bachelot lui-même, puis par Melnyk. Ces travaux, placés dans le cadre d'une symétrie sphérique, ont été complétés par Häf
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39

Stoskopf, Théo. "États de Hadamard pour des champs de Dirac en espace-temps courbe." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM006.

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Le sujet de la thèse consiste à appliquer des techniques d'analyse microlocale à la construction d'états de Hadamard pour des champs de Dirac, pour des espaces-temps généraux sous des hypothèses faibles sur leur comportement à l'infini. Dans une deuxième partie il s'agira, pour des espaces temps asymptotiquement statiques, de construire les états de vide entrants et sortants et de montrer leur propriété de Hadamard<br>This thesis is about applying microlocal techniques to the construction of Hadamard states for Dirac fields on curved spacetimes with weak conditions on their asymptotical behavi
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40

Busch, Xavier. "Effets dispersifs et dissipatifs en théorie quantique des champs en espace-temps courbe pour modéliser des systèmes de matière condensée." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112205/document.

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Les deux principales prédictions de la théorie quantique des champs en espace-temps courbe, à savoir la radiation de Hawking et la production de paires de particules ayant lieu dans un espace-temps non stationnaire, n'ont jamais été testé expérimentalement et impliquent toutes deux des processus à ultra haute énergie. En conséquence, de telles prédictions doivent être considérées prudemment. En utilisant l'analogie avec des systèmes de matière condensée mise en avant par Unruh, leur analogue pourrait être testé en laboratoire. Par ailleurs, dispersion et dissipation sont toujours présentes dan
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41

Dednam, Wynand. "Atomistic simulations of competing influences on electron transport across metal nanocontacts." Thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10500/26155.

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In our pursuit of ever smaller transistors, with greater computational throughput, many questions arise about how material properties change with size, and how these properties may be modelled more accurately. Metallic nanocontacts, especially those for which magnetic properties are important, are of great interest due to their potential spintronic applications. Yet, serious challenges remain from the standpoint of theoretical and computational modelling, particularly with respect to the coupling of the spin and lattice degrees of freedom in ferromagnetic nanocontacts in emerging spintro
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Ferrer, Philippe Alberto Friedrich. "Approximating the nucleon as a relativistic three particle system." Thesis, 1996. https://hdl.handle.net/10539/23777.

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A dissertation submitted to the faculty of Science, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Master of Science. Degree awarded with distinction on 4 December 1996.<br>This dissertation is divided into two parts: the first part deals with the concepts of angular momentum and spin in classical mechanics and quantum mechanics and relativistic quantum mechanics and their connection with magnetic moments. In the second part, a model is set up of a relativistic three particle system, based on the previou.s.ly introduced concepts, which
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43

Emami-Razavi, Mohsen. "Relativistic n-body wave equations in scalar quantum field theory /." 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR19789.

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Thesis (Ph.D.)--York University, 2006. Graduate Programme in Earth and Space Science.<br>Typescript. Includes bibliographical references (leaves 86-90). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR19789
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Staudte, Donald Stephen. "Spin - 1/2 wave equations in relativistic quantum mechanics." Phd thesis, 1993. http://hdl.handle.net/1885/109693.

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This thesis is concerned with the development of a new spin-1/2 wave equation in relativistic quantum mechanics. This equation is the spin-1/2 analogue of the spin-0 Feshbach-Villars equation. The thesis begins in chapter 1 with a review of the subject of relativistic wave equations and its place in the development of modern physics. Chapter 2 sees the derivation of the new equation (hereafter referred to as the FV1/2 equation). This derivation is presented at three levels of understanding, and is combined with an analysis of the equation using elements of the underlying mathematics of
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45

Ruschhaupt, Andreas [Verfasser]. "A relativistic extension of event enhanced quantum theory / von Andreas Ruschhaupt." 2001. http://d-nb.info/96395864X/34.

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Rindori, Davide. "Entropy current in relativistic quantum statistical mechanics." Doctoral thesis, 2021. http://hdl.handle.net/2158/1236913.

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In this work, we study the entropy production of relativistic quantum fluids at local thermodynamic equilibrium. In particular, we put forward a general method to calculate the entropy current in the framework of relativistic quantum statistical mechanics. We then apply our method to the study of two different systems, both of phenomenological concern in the context of heavy-ion collisions. The first system is a relativistic quantum fluid at global thermodynamic equilibrium with acceleration, whereas the second one is a relativistic quantum fluid with boost invariance. We calculate the thermal
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Wurm, Alexander. "Renormalization group applications in area-preserving nontwist maps and relativistic quantum field theory." 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3099521.

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Nyonyi, Yusuf. "Exact solutions for spherical relativistic models." Thesis, 2011. http://hdl.handle.net/10413/10665.

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In this thesis we study relativistic models of gravitating uids with heat ow and electric charge. Firstly, we derive the model of a charged shear-free spherically symmetric cosmological model with heat ow. The solution of the Einstein-Maxwell equations of the system is governed by the pressure isotropy condition. This condition is a highly nonlinear partial di erential equation. We analyse this master equation using Lie's group theoretic approach. The Lie symmetry generators that leave the equation invariant are found. We provide exact solutions to the gravitational potentials using the rs
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Noble, Scott Charles. "A numerical study of relativistic fluid collapse." Thesis, 2003. http://hdl.handle.net/2152/817.

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Noble, Scott Charles Morrison Philip J. Choptuik Matthew William. "A numerical study of relativistic fluid collapse." 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3122773.

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