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Dissertations / Theses on the topic 'Exact results'

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1

Valatka, Saulius. "Exact results in supersymmetric gauge theories." Thesis, King's College London (University of London), 2014. http://kclpure.kcl.ac.uk/portal/en/theses/exact-results-in-supersymmetric-gauge-theories(96b921b2-76fc-494d-8879-08168fac31fd).html.

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In this thesis we discuss supersymmetric gauge theories, focusing on exact results achieved using methods of integrability. For the larger portion of the thesis we study the N = 4 super Yang-Mills theory in the planar limit, a recurring topic being the Konishi anomalous dimension, which is roughly the analogue for the mass of the proton in quantum chromodynamics. The N = 4 supersymmetric Yang-Mills theory is known to be integrable in the planar limit, which opens up a wealth of techniques one can employ in order to nd results in this limit valid at any value of the coupling. We begin with pert
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2

Kingaby, Thomas. "Exact results in supersymmetric field theory." Thesis, Swansea University, 2003. https://cronfa.swan.ac.uk/Record/cronfa42267.

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This thesis examines N = 2 Super-Yang-Mills theory where the low-energy effective action of the theory is governed by a holomorphic function called the prepotential. The Seiberg-Witten solution of the theory determines the prepotential in terms of an complex curve and, once we compactify the theory on a circle, we will examine the identification of this complex curve with the spectral curve of the Calogero-Moser integrable system. Since the supersymmetry restricts the perturbative contributions to the prepotential, the results we gain are exact. Further, they are independent of the compactific
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3

Squarcini, Alessio. "Phase Separation and Interfaces. Exact Results." Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4900.

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We will devote Chapter 1 to a short review of traditional approaches to interfacial phenomena. This starts with an overview on phenomenological descriptions and terminates with a discussion on mean field theories of interfaces. In Chapter 2 we recall some essential notions of scattering theory in two dimensions on which we will rely in the rest of the thesis. In Chapter 3 we will pose the basis of the exact field-theoretic approach to phase separation in two dimensions. In particular, we will develop the formalism for the study of interfaces in a strip geometry. Drops on a flat substrate and t
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4

Lorenzen, Jakob Christian. "Exact results in the gauge/gravity duality." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/exact-results-in-the-gaugegravity-duality(39ad751a-a7fa-4bc5-8897-ed741649f18a).html.

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In this thesis we study the gauge/gravity duality and exact results in supersymmetric quantum field theories obtained using localization. We construct the gravity duals to a broad class of N = 2 supersymmetric gauge theories defined on a general class of three-manifolds. The gravity backgrounds are supersymmetric solutions of gauged four-dimensional supergravity and encompass all known examples of such solutions. We find that the holographically renormalized on-shell action agrees with the free energy of the field theory, which has previously been computed via localization of the partition fun
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5

Garolera, Huguet Blai. "Probing gauge theories: Exact results and holographic computations." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/289346.

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The holographic duality between gauge theories and string theories has opened a new door to access the strongly coupled regime of quantum field theories and offers, at the same time, a completely new way to understand the elusive nature of quantum gravity and the non-perturbative regime of string theory. After almost two decades of research, the current status of the correspondence is that of a solid conjecture that has passed a great number of nontrivial tests, to the point that it is generally believed to be true. The present thesis includes a collection of four pap
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6

Camacho, Gonzalo. "Exact results in the Interacting Resonant Level Model." Thesis, University of Kent, 2017. https://kar.kent.ac.uk/67108/.

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The Interacting Resonant Level Model (IRLM) is studied by making use of different standard techniques common to the study strongly correlated quantum systems. Exact results are computed both analytically and numerically, in order to obtain a full consistent theory of the model in equilibrium thermodynamics, opening the path towards a future treatment of the model.
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7

Mekareeya, Noppadol. "Exact results on moduli spaces of supersymmetric gauge theories." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7077.

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In this thesis, certain exact results in supersymmetric gauge theories are discussed. In these theories, holomorphic gauge invariant operators play a central role in understanding the structure of the space of solutions to vacuum equations, known as the moduli space. We focus on a technique to count such operators with various quantum numbers. The counting can be done by computing a partition function, known as the Hilbert series, which counts all holomorphic gauge invariant operators carrying a speci ed set of global U(1) charges. The Hilbert series can be computed exactly for various gauge t
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8

Okada, Takashi. "Matrix Models in String and M-theory and Exact Results." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175112.

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9

DOLCINI, FABRIZIO. "Exact Results on Extended Hubbard Models on One-Dimensional Chains." Doctoral thesis, Politecnico di Torino, 2001. http://hdl.handle.net/11583/2498347.

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This PhD thesis is concerned with the investigation of Extended Hubbard Models on one-dimensional lattices (chains); the approach used to such investigation is that of determining exact results. The extended Hubbard models are models of correlated electrons on lattices; they are the extensions of a model proposed by Hubbard in \cite{HUB} to explain the metal-insulator transition in $d$-transition compounds as the effect of electronic correlations, usually neglected in band theories. Later on, a need for extensions of such model was first felt within the context of high-temperature superconduc
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10

Barranco, López Alejandro. "Applications of Supersymmetry: Exact Results, Gauge/Gravity Duality and Condensed Matter." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284195.

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The study of supersymmetry has led us to a better understanding of field theories, specially in the strong coupling regime. In this thesis we have tried to show this through several examples. These are: - The first of these examples has been the application of localization techniques in supersymmetric theories. Specifically, we have used the partition function of N=2 supersymmetric Chern-Simons theory with gauge group U(N) and 2Nf flavors. To regularize the theory, it is necessary to make the computation in a three sphere whose radius, R, serves as an IR regulator which can be taken to infi
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11

Mayer, Peter. "Glassy dynamics and effective temperatures : exact results for spin chain models." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407461.

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12

FANTONI, RICCARDO. "CLASSICAL LIQUIDS: EXACT RESULTS, INTEGRAL EQUATIONS THEORY, AND MONTE CARLO SIMULATIONS." Doctoral thesis, Università degli studi di Trieste, 2004. http://thesis2.sba.units.it/store/handle/item/12550.

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13

Nedelin, Anton. "Exact Results in Five-Dimensional Gauge Theories : On Supersymmetry, Localization and Matrix Models." Doctoral thesis, Uppsala universitet, Teoretisk fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243320.

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Gauge theories are one of the corner stones of modern theoretical physics. They describe the nature of all fundamental interactions and have been applied in multiple branches of physics. The most challenging problem of gauge theories, which has not been solved yet, is their strong coupling dynamics. A class of gauge theories that admits simplifications allowing to deal with the strong coupling regime are supersymmetric ones. For example, recently proposed method of supersymmetric localization allows to reduce expectation values of supersymmetric observables, expressed through the path integral
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14

Bourton, Thomas James George [Verfasser], and Elli [Akademischer Betreuer] Pomoni. "Exact Results for N=1 Theories of Class S_k / Thomas James George Bourton ; Betreuer: Elli Pomoni." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1218688262/34.

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15

Wilkinson, Robert. "Stochastic models for the spread of infectious diseases on finite contact networks : exact results and representations." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2014701/.

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Mathematical models for the spread of infectious diseases between living organisms are crucial to humanity's endeavour to understand and control its environment. The threat posed by communicable diseases is great. For example, the 1918 flu pandemic resulted in the deaths of over 50 million people and the HIV/AIDS pandemic is still under way with 2.3 million new cases in 2012. Mathematical models allow us to make predictions about the likelihood, impact and time scale of possible epidemics, and to devise effective intervention programmes, e.g. mass vaccination. This thesis considers various sto
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16

Gregori, Daniele <1992&gt. "Quantum integrability as a new method for exact results on N=2 supersymmetric gauge theories and black holes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10485/1/Gregori_Daniele_tesi.pdf.

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In this thesis I show a triple new connection we found between quantum integrability, N=2 supersymmetric gauge theories and black holes perturbation theory. I use the approach of the ODE/IM correspondence between Ordinary Differential Equations (ODE) and Integrable Models (IM), first to connect basic integrability functions - the Baxter’s Q, T and Y functions - to the gauge theory periods. This fundamental identification allows several new results for both theories, for example: an exact non linear integral equation (Thermodynamic Bethe Ansatz, TBA) for the gauge periods; an interpretation of
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17

Bastian, Brice. "Duality web between little string theories of type A." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1117/document.

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La théorie des cordes est un de nos meilleurs candidats pour une théorie quantique de la gravité. A ce jour elle n'a pas encore été conclusive à propose de ce sujet. Malgré cela, on a réalisé qu'on peut en tirer des informations sur tout une variété de sujets, dont notamment les théories de jauges supersymétriques, en étudiant la limite de basse énergie dans le volume d'univers des branes. Cette immersion des théories de jauges en théorie des cordes nous fournit un autre point de vue. Ce dernier nous permet souvent de prendre une approche plus géométrique pour obtenir de nouveaux résultats sin
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18

KLARE, CLAUDIUS. "Supersymmetry on curved spaces and holography." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/51353.

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This thesis deals with superconformal and supersymmetric field theories on curved spaces with a view toward applications to holography and localisation. It contains two fairly different parts. In the first (and main) part we classify Euclidean and Lorentzian four-manifolds with some preserved N=1,2 supersymmetry, and Euclidean three-manifolds with some preserved N=2 supersymmetry. We take a holographic approach, starting with manifolds that preserve superconformal symmetries. Preserved supersymmetry for asymptotically locally AdS solutions implies the existence of a certain (generalised) ``con
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19

Brancotte, Bryan. "Agrégation de classements avec égalités : algorithmes, guides à l'utilisateur et applications aux données biologiques." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112184/document.

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L'agrégation de classements consiste à établir un consensus entre un ensemble de classements (éléments ordonnés). Bien que ce problème ait de très nombreuses applications (consensus entre les votes d'utilisateurs, consensus entre des résultats ordonnés différemment par divers moteurs de recherche...), calculer un consensus exact est rarement faisable dans les cas d'applications réels (problème NP-difficile). De nombreux algorithmes d'approximation et heuristiques ont donc été conçus. Néanmoins, leurs performances (en temps et en qualité de résultat produit) sont très différentes et dépendent d
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20

MALLICK, KIRONE. "Systemes hors d'equilibre : quelques resultats exacts." Paris 6, 1996. http://www.theses.fr/1996PA066747.

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Nous obtenons des solutions exactes pour un systeme de physique statistique hors d'equilibre, le modele d'exclusion asymetrique. A l'aide d'une representation operatorielle, nous pouvons calculer exactement la mesure stationnaire de certains modeles qui presentent une transition de phase a la limite thermodynamique. La meme technique nous permet de calculer les fluctuations de grandeurs physiques dans l'etat stationnaire, comme la constante de diffusion d'un traceur, ou la variance du courant a travers un lien. A l'aide d'un passage a la limite continue, nous deduisons de nos calculs une fonct
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21

Butucea, Cristina. "Estimation non parametrique adaptative de la densite de probabilite ; vitesses de convergence, constante exacte et resultats numeriques." Paris 6, 1999. http://www.theses.fr/1999PA066084.

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L'estimation non parametrique adaptative de la densite de probabilite de n observations independantes, identiquement distribuees fait l'objet de cette these. Dans un premier chapitre, nous introduisons le cadre minimax asymptotique d'estimation et, en particulier, l'estimation adaptative. L'adaptivite nous permet d'etudier et de comparer a l'aide d'un critere d'appreciation fixe, le comportement asymptotique des estimateurs, sur une reunion de classes tres larges de fonctions. Le deuxieme chapitre presente le calcul de deux vitesses adaptatives de convergence sur deux classes de type l p sobol
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22

Wynter, Thomas. "Resultats exacts pour les modeles de matrices de la gravite quantique r carre et pour les theories de jauge a deux dimensions." Paris 6, 1996. http://www.theses.fr/1996PA066724.

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On presente une solution exacte d'un modele de matrice de gravite quantique bi-dimensionelle avec un terme d'interaction proportionelle au carre de la courbure scalaire. Un reseau regulier correspond a une metrique plate. Les defauts du reseau genere une courbure locale. Pour toute constante de couplage finie, la limite infra-rouge de la theorie est decrite par la gravite pure quantique. Dans la limite ou la constante de couplage tend vers l'infinie on trouve une fonction de partition qui interpole entre la gravite pure quantique et un gaz dilue de defauts de courbure sur un fond d'espace plat
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23

Chvatík, Štěpán. "Asynchronní motor s vnějším rotorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377075.

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24

Moreira, Ana Sofia Pereira. "Study of modifications induced by thermal and oxidative treatment in oligo and polysaccharides of coffee by mass spectrometry." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17074.

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Doutoramento em Bioquímica<br>Os polissacarídeos são os componentes maioritários dos grãos de café verde e torrado e da bebida de café. Os mais abundantes são as galactomananas, seguindo-se as arabinogalactanas. Durante o processo de torra, as galactomananas e arabinogalactanas sofrem modificações estruturais, as quais estão longe de estar completamente elucidadas devido à sua diversidade e à complexidade estrutural dos compostos formados. Durante o processo de torra, as galactomananas e arabinogalactanas reagem com proteínas, ácidos clorogénicos e sacarose, originando compostos castanh
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25

Liu, Kuei-Wen, and 劉貴文. "Some Results on Exact String Matching Algorithm." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/14472736499752714951.

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碩士<br>國立暨南國際大學<br>資訊工程學系<br>96<br>In this paper, we introduce two algorithms for stringology. One is to solve the exact string matching problem and the other is to find the string cycle (period of a string). In the exact string matching problem, we are given two strings T=t1t2...tn and P=p1p2...pm. We are asked to find all occurrences of P in T. Our searching method is based upon a single character rule. Consider a location i in P. Suppose that pi is aligned with tj and pi <> tj. We then must move P in such a way that some pk=tj will be aligned with tj. In the thesis, we propose a
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Liu, Kuei-Wen. "Some Results on Exact String Matching Algorithm." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0020-2406200814333600.

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27

Rajaram, Rajeev. "Exact boundary controllability results for sandwich beam systems /." 2005.

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28

Chakraborty, Abhirup. "Processing Exact Results for Queries over Data Streams." Thesis, 2010. http://hdl.handle.net/10012/5048.

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In a growing number of information-processing applications, such as network-traffic monitoring, sensor networks, financial analysis, data mining for e-commerce, etc., data takes the form of continuous data streams rather than traditional stored databases/relational tuples. These applications have some common features like the need for real time analysis, huge volumes of data, and unpredictable and bursty arrivals of stream elements. In all of these applications, it is infeasible to process queries over data streams by loading the data into a traditional database management system (DBMS) or
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29

PUCCI, FABRIZIO. "Exact Results for Wilson loops in N = 4 Supersymmetric Yang Mills Theory." Doctoral thesis, 2010. http://hdl.handle.net/2158/481856.

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30

Milanič, Martin. "Algorithmic developments and complexity results for finding maximum and exact independent sets in graphs." 2007. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.13482.

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31

Ejima, Satoshi [Verfasser]. "Exact numerical and analytical results for correlated lattice electrons in one dimension / vorgelegt von Satoshi Ejima." 2006. http://d-nb.info/97965808X/34.

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32

Gontscharuk, Veronika [Verfasser]. "Asymptotic and exact results on FWER and FDR in multiple hypotheses testing / vorgelegt von Veronika Gontscharuk." 2010. http://d-nb.info/1011975238/34.

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33

Escobedo, Jorge. "Integrability in AdS/CFT: Exacts Results for Correlation Functions." Thesis, 2012. http://hdl.handle.net/10012/6788.

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We report on the first systematic study of correlation functions in N=4 super Yang-Mills theory using integrability techniques. In particular, we show how to compute three- and four- point functions of single-trace gauge-invariant operators at tree level in the SU(2) sector of the theory. Using the AdS/CFT correspondence, the correlation functions that we compute can be thought of as the joining or splitting of strings moving in AdS5 × S5. We show that when one (two) of the operators in the three-(four-)point function are taken to be small BPS operators, our weak coupling results match perfect
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34

Tsai, Yu-An, and 蔡宇安. "Non-Markovain Two-Time correlation functions: Exact Result v.s Perturbation Approach." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/22443886533994020497.

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碩士<br>國立臺灣大學<br>物理研究所<br>99<br>A two-level system which decays spontaneously into field vacuum is studied through the Jaynes-Cummings model in the rotating wave approximation (RWA).When at most one excitation is considered, this model is exactly solvable. Here we evaluate the non-Markovian two-time correlation functions (CF&apos;&apos;s) of system operators for this model in two ways: one by directly solving the system-environment evolution,and the other by using the perturbative time-convolutionless non-Markovian master equation approach. We derive valid to fourth order in system-bath couplin
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