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Dissertations / Theses on the topic 'Cold Entropy Field Theory'

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Published: 7 June 2025
Last updated: 2 August 2025

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1

Mezei, Márk (Márk Koppany). "Counting degrees of freedom in quantum field theory using entanglement entropy." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91389.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2014.<br>141<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 199-208).<br>We devote this thesis to the exploration of how to define the number of degrees of freedom in quantum field theory. Intuitively, the number of degrees of freedom should decrease along the renormalization group (RG) flow, and should be independent of the RG scale at a conformal fixed point. We argue that a refinement of entanglement entropy is a promising candidate for such measure. Indeed, in two and three
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2

Winstanley, Elizabeth. "Aspects of four-dimensional black holes with hair : stability and entropy considerations." Thesis, University of Oxford, 1996. https://ora.ox.ac.uk/objects/uuid:bcb07e40-9538-42a4-a3e9-7bbbd834c7c4.

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In recent years, a large number of black holes have been presented as candidates for an evasion of the "no-hair" conjecture. These examples typically have two features: a non-Abelian gauge field and instability. A large part of this thesis is devoted to a detailed study of the Einstein-Yang-Mills-Higgs (EYMH) black holes, including the analytic proof of the evasion of the "nohair" theorem in this case and proving that the black holes are unstable. We also consider an example of a "hairy" black hole not involving a non-Abelian gauge field, which arises in a higher derivative model of gravity de
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3

Palazzo, David. "Entanglement entropy in 1-d quantum spin chains." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7431/.

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In questa tesi abbiamo studiato il comportamento delle entropie di Entanglement e dello spettro di Entanglement nel modello XYZ attraverso delle simulazioni numeriche. Le formule per le entropie di Von Neumann e di Renyi nel caso di una catena bipartita infinita esistevano già, ma mancavano ancora dei test numerici dettagliati. Inoltre, rispetto alla formula per l'Entropia di Entanglement di J. Cardy e P. Calabrese per sistemi non critici, tali relazioni presentano delle correzioni che non hanno ancora una spiegazione analitica: i risultati delle simulazioni numeriche ne hanno confermato la p
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4

Ried, Katja [UNESP]. "Can entanglement explain black hole entropy?" Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/91804.

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Made available in DSpace on 2014-06-11T19:25:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-11-10Bitstream added on 2014-06-13T18:28:53Z : No. of bitstreams: 1 ried_k_me_ift.pdf: 945643 bytes, checksum: 96fe05a885b68fc97682e8238f4ecf2c (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>When seeking inspiration for a future theory of quantum gravity, studying black holes is a promising ansatz, since they present us with several puzzles at the intersection of quantum theory and gravity. Am
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5

Ried, Katja. "Can entanglement explain black hole entropy? /." São Paulo : [s.n.], 2011. http://hdl.handle.net/11449/91804.

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Orientador: George Emanuel Avraam Matsas<br>Banca: Daniel Augusto Turolla Vanzella<br>Banca: Ernesto Galvão<br>Resumo: Não disponível<br>Abstract: When seeking inspiration for a future theory of quantum gravity, studying black holes is a promising ansatz, since they present us with several puzzles at the intersection of quantum theory and gravity. Among these is their entropy: although there are compelling arguments for its existence, its origin and statistical meaning remain a mystery. Previous work showed that at least some aspects of this phenomenon can be accounted for by the entanglement
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6

Štikonas, Andrius. "Entanglement entropy of locally perturbed thermal systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28910.

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In this thesis we study the time evolution of Rényi and entanglement entropies of thermal states in Conformal Field Theory (CFT). These quantities are usually hard to compute but Ryu-Takayanagi (RT) and Hubeny-Rangamani-Takayanagi (HRT) proposals allow us to find the same quantities using calculations in general relativity. We will introduce main concepts of holography, quantum information and conformal field theory that will be used to derive the results of this thesis. In the first part of the thesis, we explicitly compute entanglement entropy of the rotating BTZ black hole by directly apply
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7

Gordon, Christopher. "Adiabatic and entropy perturbations in cosmology." Thesis, University of Portsmouth, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369474.

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8

Ji, Chen. "Universality and Beyond: Effective Field Theory for Three-Body Physics in Cold Atoms and Halo Nuclei." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1343316877.

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9

Constantinou, Maria. "Cracking the brain's code : how do brain rhythms support information processing?" Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/cracking-the-brains-code-how-do-brain-rhythms-support-information-processing(b1eb1d9b-8a3c-4430-b6e9-51fcddd50098).html.

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The brain processes information sensed from the environment and guides behaviour. A fundamental component in this process is the storage and retrieval of past experiences as memories, which relies on the hippocampal formation. Although there has been a great progress in understanding the underlying neural code by which neurons communicate information, there are still open questions. Neural activity can be measured extracellularly as either spikes or field potentials. Isolated spikes and bursts of high-frequency spikes followed by silent periods can transmit messages to distant networks. The lo
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10

Boulet, Antoine. "Density functional theory for Fermi systems with large s-wave scattering length : application to atomic and nuclear physics." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS212/document.

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Dans ce travail de thèse, des théories de type fonctionnelle de la densité sont développées pour des systèmes en interaction forte possédant une longueur de diffusion en onde s, notée as, anormalement grande. Les gaz atomiques ou la matière neutronique sont des exemples physiques de tels systèmes. La théorie des perturbations à N-corps est tout d'abord utilisée pour décrire les systèmes de fermions dilués. Cette approche conduit par exemple à la fonctionnelle de Lee-Yang qui est valide dans une plage de densité très restreinte lorsque la longueur de diffusion en onde s devient grande. Pour éte
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11

Reis, João Lucas Miqueleto. "Buracos negros, entropia e emaranhamento." reponame:Repositório Institucional da UFABC, 2017.

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Orientador: Prof. Dr. André Gustavo Scagliusi Landulfo<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2017.<br>A descoberta do comportamento termodinâmico de buracos negros no contexto da teoria quântica de campos em espaços-tempos curvos deu origem a diversas questões, dentre elas onde estão e quais são os graus de liberdade associados a entropia dos mesmos. Nessa dissertação estudamos esse tópico propondo que, se não toda, alguma parte desta entropia é devida ao emaranhamento entre os graus de liberdade, internos e externos ao buraco, dos campos
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12

Bois, Valentin. "Effets de la deuxième orbitale dans les systèmes unidimensionnels de fermions alcalino-terreux ultrafroids." Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0946/document.

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La réalisation expérimentale de la condensation de Bose-Einstein (BEC) a ouvert un nouveau champ d'investigation très fertile dans l'étude des atomes froids. En particulier, la possibilité de synthétiser des gaz de fermions piégés dans des réseaux optiques représente un développement de la plus haute importance pour la physique de la matière condensée. Ceci ouvre notamment sur la perspective d'étudier des phases quantiques exotiques stabilisées dans des systèmes d'électrons fortement corrélés.Récemment, les gaz atomiques d'alcalino-terreux ou d'ytterbium ont suscité un vif intérêt et ont été r
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13

Berthiere, Clément. "Entanglement, boundaries and holography." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4017.

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La notion d’entropie d’intrication a eu un profond impact sur la physique théorique, particulièrement depuis ces dix dernières années. D’abord introduite afin expliquer l’entropie des trous noirs, son champ d’application s’est par la suite ouvert à une grande variété de domaines de recherche, de la matière condensée à la gravitation quantique, de l’information quantique à la théorie quantique des champs. Dans ce contexte scientifique effervescent, l’entropie d’intrication apparait comme un outil central et doit donc intensivement être étudiée. A l’origine de cette thèse se trouve le désir de m
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14

Dupic, Thomas. "Application des théories conformes étendues à des problèmes de physique statistique." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS260.

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L'étude des phénomènes critiques en physique statistique bidimensionnelle a pour outils privilégiés la théorie conforme et les modèles intégrables. La relation entre ces deux formalismes est un domaine de recherche actif, notamment dans le cadre des théories dites non-rationnelles. Cette thèse s'intéresse à certains systèmes critiques décrits par une théorie conforme étendue, c'est-à-dire présentant des symétries supplémentaires. Le premier problème étudié est le modèle de boucles entièrement compactes (fully packed loop model, FPL). Les modèles de boucles sont des modèles de physique statisti
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15

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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16

Collura, Mario. "Aspects hors de l'équilibre de systèmes quantiques unidimensionnels fortement corrélés." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0009/document.

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Dans cette thèse, nous avons répondu à certaines questions ouverts dans le domaine de la dynamique hors équilibre des systèmes quantiques unidimensionnels fermés. Durant ces dernières années, les avancées dans les techniques expérimentales ont revitalisé la recherche théorique en physique de la matière condensée et dans l'optique quantique. Nous avons traité trois sujets différents et en utilisant des techniques à la fois numériques et analytiques. Dans le cadre des techniques numériques, nous avons utilisé des méthodes de diagonalisation exacte, l'algorithme du groupe de renormalisation de la
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17

Carrapatoso, Kléber. "Théorèmes asymptotiques pour les équations de Boltzmann et de Landau." Phd thesis, Université Paris Dauphine - Paris IX, 2013. http://tel.archives-ouvertes.fr/tel-00920455.

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Nous nous intéressons dans cette thèse à la théorie cinétique et aux systèmes de particules dans le cadre des équations de Boltzmann et Landau. Premièrement, nous étudions la dérivation des équations cinétiques comme des limites de champ moyen des systèmes de particules, en utilisant le concept de propagation du chaos. Plus précisément, nous étudions les probabilités chaotiques sur l'espace de phase de ces systèmes de particules : la sphère de Boltzmann, qui correspond à l'espace de phase d'un système de particules qui évolue conservant le moment et l'énergie ; et la sphère de Kac, corresponda
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18

Nowling, Sean Robert. "Conformal field theory descriptions of string initial conditions and quantum entanglement entropy /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3301204.

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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.<br>Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1071. Adviser: Sheldon Katz. Includes bibliographical references (leaves 117-123) Available on microfilm from Pro Quest Information and Learning.
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19

Datta, Shouvik. "Higher Spins, Entanglement Entropy And Holography." Thesis, 2015. https://etd.iisc.ac.in/handle/2005/2653.

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The idea of holography [1, 2] finds a concrete realization in form of the AdS/CFT correspondence [3, 4]. This duality relates a field theory with conformal symmetries to quantum gravity living in one higher dimension. In this thesis we study aspects of black hole quasinormal modes, higher spin theories and entanglement entropy in the context of this duality. In almost all cases we have been able to subject the duality to some precision tests. Quasinormal modes encode the spectrum of black holes and the time-scale of pertur- bations therein [5]. From the dual CFT viewpoint they are the poles
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20

Datta, Shouvik. "Higher Spins, Entanglement Entropy And Holography." Thesis, 2015. http://etd.iisc.ernet.in/handle/2005/2653.

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The idea of holography [1, 2] finds a concrete realization in form of the AdS/CFT correspondence [3, 4]. This duality relates a field theory with conformal symmetries to quantum gravity living in one higher dimension. In this thesis we study aspects of black hole quasinormal modes, higher spin theories and entanglement entropy in the context of this duality. In almost all cases we have been able to subject the duality to some precision tests. Quasinormal modes encode the spectrum of black holes and the time-scale of pertur- bations therein [5]. From the dual CFT viewpoint they are the poles o
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21

Mukherjee, Jyotirmoy. "Entanglement properties of gauge theories and the graviton." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6158.

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Entanglement entropy is emerging as a useful quantity to study critical phenomena in quantum systems, black holes physics, and holography. In this presentation, we discuss entanglement properties of gauge theories and the graviton in the ground state as well as excited states corresponding to local quenches. We show that the quantum entanglement entropy of the ground state of the free Maxwell field in d=4 dimensions, conformal p-forms, and conformal higher spins can be obtained from the partition function on the hyperbolic cylinder. We demonstrate that the entanglement entropy of l
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22

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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23

McArthur, Ian Albert. "Minimum entropy techniques for determining the period of W UMA stars." Diss., 2014. http://hdl.handle.net/10500/19898.

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This MSc report discusses the attributes of W Ursae Majoris (W UMa) stars and an investigation into the Minimum Entropy (ME) method, a digital technique applied to the determination of their periods of variability. A Python code programme was written to apply the ME method to photometric data collected on W UMa stars by the All Sky Automated Survey (ASAS). Starting with the orbital period of the binaries estimated by ASAS, this programme systematically searches around this period for the period which corresponds to the lowest value of entropy. Low entropy here means low scatter (or spread) of
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24

PANEBIANCO, LORENZO. "Quantum null energy condition, loop groups and modular nuclearity." Doctoral thesis, 2022. http://hdl.handle.net/11573/1642718.

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When dealing with Quantum Information objects in Quantum Field Theory (QFT), the algebraic approach seems a good choice, since the tools regarding quantum entropy can be formulated very precisely in terms of operator algebras. Quantum information aspects of QFT naturally take place in the framework of quantum black holes thermodynamics, as for example the Bekenstein Bound and the Landauer's principle show. However, more unexpected and interesting connections between the relative entropy and the stress energy tensor have arisen, and in particular it is of interest to provide and prove an axioma
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25

Liu, Ju. "Thermodynamically consistent modeling and simulation of multiphase flows." Thesis, 2014. http://hdl.handle.net/2152/28353.

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Multiphase flow is a familiar phenomenon from daily life and occupies an important role in physics, engineering, and medicine. The understanding of multiphase flows relies largely on the theory of interfaces, which is not well understood in many cases. To date, the Navier-Stokes-Korteweg equations and the Cahn-Hilliard equation have represented two major branches of phase-field modeling. The Navier-Stokes-Korteweg equations describe a single component fluid material with multiple states of matter, e.g., water and water vapor; the Cahn-Hilliard type models describe multi-component materials wit
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26

Jędrak, Jakub. "Real-space pairing in an extended t-J model." Praca doktorska, 2011. https://ruj.uj.edu.pl/xmlui/handle/item/53649.

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Nadprzewodnictwo wysokotemperaturowe w tlenkach miedzi (krótko: miedzianach, np. La2-xSrxCuO4, YBa2Cu3O6+δ lub Bi2Sr2CaCu2O8+δ) pozostaje jednym z najbardziej spektakularnych zjawisk w fizyce materii skondensowanej. Od jego odkrycia w roku 1986, ukazała sie ogromna liczba (~ 105) prac poswięconych tej tematyce. Do tej pory nie istnieje jedna, powszechnie akceptowana teoria nadprzewodnictwa wysokotemperaturowego. Niemniej jednak, uwaza się prawie powszechnie, iz prawidlowy opis tego zjawiska mozna uzyskać w ramach jednopasmowego modelu Hubbarda lub wywodzacego sie zeó modelu t -J . Ten ostatni
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