Dissertations / Theses: 'Classical topics'

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Kobayashi, Kohjiro. "Topics in classical and quantum phase transitions." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1199254396.

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Almaas, Eivind. "Topics in the theory of quantum and classical networks /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486402957195756.

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Gravanis, Elias. "Topics in D-membrane physics and membrane inspired classical gravity." Thesis, King's College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441973.

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Godskesen, Simon. "Geometric Phases in Classical and Quantum Systems." Thesis, Uppsala universitet, Teoretisk fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388414.

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We are accustomed to think the phase of single particle states does not matter. After all, the phase cancels out when calculating physical observables. However, the geometric phase can cause interference even in single particle states and can be measured. Berry’s phase is a geometric phase the system accumulates as its time-dependent Hamiltonian is subjected to closed adiabatic excursion in parameter space. In this report, we explore how Berry’s phase manifests itself in various fields of physics, both classical and quantum mechanical. The Hannay angle is a classical analogue to Berry’s phase and they are related by a derivative. The Aharonov-Bohm effect is a manifestation of Berry’s phase. Net rotation of deformable bodies in the language of gauge theory can be translated as a Berry phase. The well-known BornOppenheimer approximation is a molecular Aharonov-Bohm effect and is another manifestation of Berry’s Phase.

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Singh, Javed Kiran. "Topics in the geometry and physics of Galilei invariant quantum and classical dynamics." Thesis, University of Hull, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342978.

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Sardharwalla, Imdad Sajjad Badruddin. "Topics in computing with quantum oracles and higher-dimensional many-body systems." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/264956.

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Since they were first envisioned, quantum computers have oft been portrayed as devices of limitless power, able to perform calculations in a mere instant that would take current computers years to determine. This is, of course, not the case. A huge amount of effort has been invested in trying to understand the limits of quantum computers---under which circumstances they outperform classical computers, how large a speed-up can be gained, and what draws the distinction between quantum and classical computing. In this Ph.D. thesis, I investigate a few intriguing properties of quantum computers involving quantum oracles and classically-simulatable quantum circuits. In Part I I study the notion of black-box unitary operations, and procedures for effecting the inverse operation. Part II looks at how quantum oracles can be used to test properties of probability distributions, and Part III considers classes of quantum circuits that can be simulated efficiently on a classical computer. In more detail, Part I studies procedures for inverting black-box unitary operations. Known techniques are generally limited in some way, often requiring ancilla systems, working only for restricted sets of operators, or simply being too inefficient. We develop a novel procedure without these limitations, and show how it can be applied to lift a requirement of the Solovay-Kitaev theorem, a landmark theorem of quantum compiling. Part II looks at property testing for probability distributions, and in particular considers a special type of access known as the \textit{conditional oracle}. The classical conditional oracle was developed by Canonne et al. in 2015 and subsequently greatly explored. We develop a quantum version of this oracle, and show that it has advantages over the classical process. We use this oracle to develop an algorithm that decides whether or not a mixed state is fully mixed. In Part III we study classically-simulatable quantum circuits in more depth. Two well-known classes are Clifford circuits and matchgate circuits, which we briefly review. Using these as inspiration, we use the Jordan-Wigner transform to develop new classes of non-trivial quantum circuits that are also classically simulatable.

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Jogenfors, Jonathan. "A Classical-Light Attack on Energy-Time Entangled Quantum Key Distribution, and Countermeasures." Licentiate thesis, Linköpings universitet, Informationskodning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114073.

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Quantum key distribution (QKD) is an application of quantum mechanics that allowstwo parties to communicate with perfect secrecy. Traditional QKD uses polarization of individual photons, but the development of energy-time entanglement could lead to QKD protocols robust against environmental effects. The security proofs of energy-time entangled QKD rely on a violation of the Bell inequality to certify the system as secure. This thesis shows that the Bell violation can be faked in energy-time entangled QKD protocols that involve a postselection step, such as Franson-based setups. Using pulsed and phase-modulated classical light, it is possible to circumvent the Bell test which allows for a local hidden-variable model to give the same predictions as the quantum-mechanical description. We show that this attack works experimentally and also how energy-time-entangled systems can be strengthened to avoid our attack.

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Nilsson, Daniel. "The Ratio of Reality : A study of the gyromagnetic ratio in theories ranging from classical mechanics to string theory." Thesis, Uppsala universitet, Teoretisk fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448767.

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In this project a theoretical study of the so called gyromagnetic ratio was done by investigating classical mechanics, Dirac theory and string theory. The gyromagnetic ratio is a constant term appearing in the coupling between angular momentum and magnetic moment for a particle. A universality in quantum field theory claiming g = 2 regardless of spin is known to exist which also agrees with the found values (g = 2) of the Dirac and string theory. The proof of the aforementioned universality in quantum field theory was sketched in the project by showing that the W-boson Lagrangian is well behaved in the massless limit. Furthermore it is shown that the spin equations of motion for a particle is greatly reduced if g = 2 regardless of spin. I det här projektet utfördes en teoretisk studie av den så kallade gyromagnetsika kvoten genom att undersöka klassisk mekanik, Dirac-teori och strängteori. Den gyromagnetiska kvoten är en konstant term som visar sig i kopplingen mellan rörelsemängsmoment och magnetiskt moment för en partikel. I kvantfältsteori existerar en universalitet som hävdar att g = 2 oberoende av spin. Denna universalitet stämmer överens med de funna värden på g från Dirac-teori och strängtoeri. Beviset för denna universalitet testades genom ett exempel där Lagrangianen för W-bosonen i kvantfältsteori visades bete sig som förväntat när massan för partikeln tilläts gå mot noll. Vidare undersöktes rörelseekvationerna för ett system helt bestämt av dess spin. I dessa kan det visas att ett universellt värde på g oavsett spin reducerar dessa ekvationer avsevärt.

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Echeverria, Fernando Thorne Kip S. "Topics in general relativity theory : gravitational-wave measurements of black-hole parameters ; gravitational collapse of a cylindrical body ; and classical-particle evolution in the presence of closed, timelike curves /." Diss., Pasadena, Calif. : California Institute of Technology, 1993. http://resolver.caltech.edu/CaltechETD:etd-12082008-095402.

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Bermúdez, Cubas Yaiza. "La música clásica preexistente en el cine ambientado en la segunda mitad del siglo XVIII. Usos estéticos, tópicos y anacronismos." Doctoral thesis, Universitat Ramon Llull, 2014. http://hdl.handle.net/10803/273772.

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Aquesta investigació pretén realitzar un estudi sobre els usos de determinades composicions clàssiques preexistents en pel·lícules històriques ambientades a la segona meitat del segle XVIII. Des d’aquesta franja temporal, pretenem demostrar quines són les relacions que es produeixen entre l’anomenada música del classicisme tal i com se la considera de de la musicologia tradicional i les pel·lícules que recreen aquesta època, a saber, la Il·lustració i Revolució respectivament. Esta investigación pretende realizar un estudio sobre los usos de determinadas composiciones clásicas preexistentes en películas históricas ambientadas en la segunda mitad del siglo XVIII. Desde esta franja temporal, pretendemos demostrar cuáles son las relaciones que se producen entre la llamada música del clasicismo tal y como se le considera desde la musicología tradicional y las películas que recrean esta época, a saber, Ilustración y Revolución respectivamente. This research looks forward to make a study of the uses of determined preexisting classical composition settled in the second half of the XVIII century in historical movies. From this timeframe, what we hope is to demonstrate which are the relationships that come to life between the classicism music as its considered by traditional musicology and the recreational movies of the Illustration and Revolution respectively.

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Rego, Eusiel Silva do. "Fernando Sor e as transcrições Opus 19 para violão de Seis árias escolhidas de A flauta mágica de Mozart: uma abordagem estético-analítica." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/27/27158/tde-06032013-160229/.

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Este trabalho visa abordar conceitos estéticos, musicais e históricos (relacionados à época do Iluminismo) que envolvem as transcrições para violão \"Six Airs Choisis de l\'Opéra de Mozart: \"Il flauto magico, arrangés pour guitare\" Op. 19 do compositor e violonista espanhol Fernando Sor (1778-1839), publicadas entre os anos de 1823 a 1825, em Londres, e baseadas em árias de A flauta mágica k620 (1791) de Mozart. O processo de transcrição empreendido por Fernando Sor exigiu, inclusive por necessidades históricas (aproximadamente 35 anos separam essas obras), uma mudança de concepção da escritura instrumental, pois, para Sor, tratava-se de verter a essência de um pensamento musical concebido no meio operático e apresentá-lo sob o conceito sonoro de um instrumento solo emergente, como foi o caso do violão no final do século XVIII e primeiras décadas do século XIX. Assim, do ponto de vista instrumental, elementos como textura, estilo de acompanhamento e conceito de condução de vozes, para citar apenas alguns aspectos, sofreram mudanças de concepção, resultando muitas vezes quase em uma nova composição e, até mesmo, outra percepção da forma musical, porque, acima de tudo, o elemento dramáticoliterário está ausente. This paper aims at addressing the aesthetic, musical and historical concepts (related to the Enlightenment) that involve the guitar transcriptions \"Six Airs Choisis de l\'Opéra de Mozart: \"Il flauto magico, arrangés pour guitare\" Op. 19 by Spanish composer and guitarist Fernando Sor (1778-1839), published between the years 1823 to 1825, in London, and based in Mozart\'s Die Zauberflöte k620 (The Magic Flute). The transcription\'s process undertaken by Fernando Sor required, even for historical purposes (the compositions were created 35 years apart), a change in the concept of instrumental writing. For Sor, it was a question of translating the essence of the musical thought conceived in an operatic way and presenting it under a sonorous concept of an emerging, solo instrument as had been the case of the guitar in the late 18th century and in the first decades of the 19th century. From the instrumental perspective, therefore, elements such as texture, style of accompaniment and the voice leading concept, to name but a few, have undergone conceptual changes, often resulting almost in a new composition and even a different perception of the musical form since, above all, the elements of drama and literature are absent.

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Palmer, James K. N. "Form-functional and topical sources of humour in classical instrumental music." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54603.

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Most of us can recall chuckling, or even laughing out loud, at a humorous musical passage and perhaps recalling how much that experience increased our enjoyment of the music. This study focuses on humour in the instrumental works of Haydn, Mozart, and Beethoven: composers who have been singled out by contemporary and modern scholars for their ingenuity and mastery of the Classical style. In the most general sense, musical humour arises when composers play with established conventions of musical discourse by writing something incongruous according to the stylistic context. Chapter 1 demonstrates how historical critics understood the role of contrast in examples of musical humour and wit. It then surveys many recent music-theoretical discussions of musical humour, before briefly introducing how elements of contrast, “valence shifts,” and “opposition” are involved in musical humour from the Classical period. This study’s analytical and theoretical approach to musical humour draws on recent studies of musical humour, form, and communication in the Classical style, as well as concepts from recent linguistic theories of humour. Chapter 2 introduces the two primary strategies Classical instrumental composers employed to create musical humour: “opposition” and “excess.” Chapters 3 and 4 discuss a wide range of musical examples to explore how composers deployed formal functions and musical topics to produce humour. These discussions provide a sense of the wide range of effects that fall under the umbrellas of opposition and excess. Chapter 5 concludes by briefly examining some performance applications of this study and suggesting some further potential sources of musical humour. Arts, Faculty of Music, School of Graduate

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Sharland, Suzanne. "Captatio in law, life and literature : a study of the topos of inheritance-hunting in the context of Roman testamentary legislation and social practice." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/18255.

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"Captatio and the captator are stock elements of literature and undoubtedly existed in life, but as actual practice and figure in Roman society they are nearly impossible to identify" (Champlin 1989: 212). Captatio (inheritancehunting), as it appears in Latin literature, can be defined as the systematic courtship of elderly, preferably sickly or dying, childless wealthy people by social adventurers known as captatores, with the aim of gaining inheritances from these people by will. The methods by which this is shown to be achieved include gift-giving, salutatio, sexual favours, flattery etc. Roman literature suggests that this practice often took place within the exchange network of amicitia. This thesis examines captatio, as presented in the Latin literature of the early Empire, in the context of definable legal and social structures. It is not so much the purpose of this study to decide whether captatio existed or was a purely literary conceit, as to examine this literary topos in its broader context.

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Apelthun, Catharina. "Topic modeling on a classical Swedish text corpus of prose fiction : Hyperparameters’ effect on theme composition and identification of writing style." Thesis, Uppsala universitet, Statistiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-441653.

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A topic modeling method, smoothed Latent Dirichlet Allocation (LDA) is applied on a text corpus data of classical Swedish prose fiction. The thesis consists of two parts. In the first part, a smoothed LDA model is applied to the corpus, investigating how changes in hyperparameter values affect the topics in terms of distribution of words within topics and topics within novels. In the second part, two smoothed LDA models are applied to a reduced corpus, only consisting of adjectives. The generated topics are examined to see if they are more likely to occur in a text of a particular author and if the model could be used for identification of writing style. With this new approach, the ability of the smoothed LDA model as a writing style identifier is explored. While the texts analyzed in this thesis is unusally long - as they are not seg- mented prose fiction - the effect of the hyperparameters on model performance was found to be similar to those found in previous research. For the adjectives corpus, the models did succeed in generating topics with a higher probability of occurring in novels by the same author. The smoothed LDA was shown to be a good model for identification of writing style. Keywords: Topic modeling, Smoothed Latent Dirichlet Allocation, Gibbs sam- pling, MCMC, Bayesian statistics, Swedish prose fiction.

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Shen, Pei [Verfasser], Lutz [Gutachter] Kaufmann, and Jürgen [Gutachter] Weigand. "Dealing with power in buyer–supplier relationships : perspectives on a classic topic / Pei Shen ; Gutachter: Lutz Kaufmann, Jürgen Weigand." Vallendar : WHU - Otto Beisheim School of Management, 2016. http://d-nb.info/1170674976/34.

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Wetherbee, Benjamin James. "Toward a Rhetoric of Film: Theory and Classroom Praxis." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1313119045.

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Huang, Yi-kai, and 黃怡凱. "STUDY on TOPICS of CLASSICAL MECHANICS." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/84019590602958603482.

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碩士 國立交通大學 應用數學系 89 We can use the concept of the differentiable manifold to express a system with an ideal holonomic constraint, and we can define the generalized coordinate on a chart of an atlas of the manifold. So we can solve it by Lagrange equation. Of course we will study some topics in mechanics like small oscillation, the motion of a rigid body. Finally, we will investigate of sleeping and fast tops even of the case that in the absence of gravity.

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"Fast Classical Simulation of Linear Quantum Optics Applied to Topics in Quantum Communication and Computation." Tulane University, 2018.

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acase@tulane.edu In this dissertation we test our ability to implement linear entangling operations between small numbers of photons for application in quantum communication and computation. We begin by presenting a fast and highly parallelizable numerical algorithm for simulating linear optical circuits on classical hardware. Then, we apply this algorithm to three independent topics in quantum information: First, in Chapter 2, we determine the information capacity of an optical quantum channel and show that a linear encoding is generally sufficient to achieve this capacity. In Chapter 3 we introduce a computational encoding basis wherein qubits are stored in single-photon blocks and then test our ability to apply entangling operations between blocks. Finally, in Chapter 4, we use our algorithm to make progress in the long-standing problem of designing a near-perfect optical Bell state analyzer. We find a clear trend in state distinguishability as we incorporate unentangled pairs of ancilla photons. We also prove that if a measurement outcome in which all photons are bunched into only two output modes is possible, then perfect state discrimination is impossible. We then present a set of conditions that prevent this outcome. 1 Jake A Smith

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Crisnejo, Gabriel. "Aspectos teóricos de lentes gravitacionales." Bachelor's thesis, 2017. http://hdl.handle.net/11086/5796.

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En este trabajo analizamos la teoría de lentes gravitaciones débiles sobre un background plano. Obtenemos expresiones concretas para los escalares ópticos a segundo orden en la perturbación de la métrica plana de forma general en el sentido que no hacemos mención ni de la extensión de la lente ni de la forma de la misma. Calculamos explícitamente los escalares ópticos en el gauge generalizado de Poisson. Finalmente, considerando lentes axialmente simétricas en la aproximación de lente delgada obtenemos una expresión para el ángulo de deflexión a segundo orden en la perturbación de la métrica plana.

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Echeverria, Fernando. "Topics in general relativity theory : gravitational-wave measurements of black-hole parameters; gravitational collapse of a cylindrical body; and classical-particle evolution in the presence of closed, timelike curves." Thesis, 1993. https://thesis.library.caltech.edu/4882/1/Echeverria_f_1993.pdf.

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In this thesis I present three separate studies on three different topics in General Relativity. The first study investigates the accuracy with which the mass and angular momentum of a black hole can be determined by measurements of gravitational waves from the hole, using a laser-interferometer gravitational-wave detector. The black hole is assumed to have been strongly perturbed, perhaps by coalescence with a binary companion, and the detector measures the waves produced by its resulting vibration and ring-down. The uncertainties in the measured mass and angular momentum arise from the unavoidable presence of noise in the detector. It is found that the faster the hole rotates, the more accurate the measurements will be, with the uncertainty in the angular momentum decreasing rapidly with increasing rotation speed. It is also found that the errors in the mass and angular momentum are highly correlated. The second study is an analysis of the gravitational collapse of an infinitely long, cylindrical dust shell. This analysis is expected to be helpful in understanding the behavior during collapse of more realistic, finite-length bodies. It is found that the collapse evolves into a naked singularity in finite time, as measured by a distant observer or by one riding on the shell. Analytical expressions for the variables describing the collapse are found at late times, near the singularity. The picture is completed with a numerical simulation that follows the collapse from the start until very close to the singularity. The singularity is found to be strong, in the sense that an observer riding on the shell will be infinitely stretched in the direction parallel to the symmetry axis, and infinitely compressed in the azimuthal direction. The gravitational waves emitted from the collapse are also analyzed. The last study focuses on a different kind of phenomenon, namely, the consequences of the existence of closed timelike curves in a spacetime that contains a wormhole. One might expect that the closed timelike curves would cause difficulty for the initial value problem for systems that evolve in such a spacetime: a system with apparently well-posed initial conditions might have no self-consistent solutions to its evolution equations. We study the simple case of a macroscopic, classical particle with a hard-sphere potential (a "billiard ball"), and we focus attention on initial conditions for which the evolution, if followed naively, is self- inconsistent: the ball enters one mouth of the wormhole and then comes out of the other mouth at an earlier time, then collides with its younger self, preventing itself from ever entering the first mouth. We find, surprisingly, that for all such "dangerous" initial conditions, there are an infinite number of self-consistent evolutionary solutions, involving a glancing collision and any number of wormhole traversals. We also find that for many non-dangerous initial conditions, there also exist an infinity of possible evolutions.

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Dissertations / Theses on the topic 'Classical topics'

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