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Uwe-Jens Wiese. Tsapalis, Antonios S., 1968- Massachusetts Institute of Technology. Department of Physics 2009-10-01T15:33:21Z 2009-10-01T15:33:21Z 1998 1998 http://hdl.handle.net/1721.1/47700 42284780 Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998. Includes bibliographical references (leaves 175-179). This thesis deals with two topics in lattice field theories. In the first part we discuss aspects of renormalization group flow and non-perturbative improvement of actions for scalar theories regularized on a lattice. We construct a perfect action, an action which is free of lattice artifacts, for a given theory. It is shown how a good approximation to the perfect action - referred to as classically perfect - can be constructed based on a well-defined blocking scheme for the 0(3) non-linear o-model. We study the O(N) non-linear r-model in the large-N limit and derive analytically its perfect action. This action is applied to the 0(3) model on a square lattice. The Wolff cluster algorithm is used to simulate numerically the system. We perform scaling tests and discuss the scaling properties of the large-N inspired perfect action as opposed to the standard and the classically perfect action. In the second part we present a new formulation for a quantum field theory with Abelian gauge symmetry. A Hamiltonian is constructed on a four-dimensional Euclidean space-time lattice which is invariant under local transformations. The model is formulated as a 5-dimensional path integral of discrete variables. We argue that dimensional reduction will allow us to study the behavior of the standard compact U(1) gauge theory in 4-d. Based on the idea of the loop-cluster algorithm for quantum spins, we present the construction of a flux-cluster algorithm for the U(1) quantum link model for the spin-1/2 quantization of the electric flux. It is shown how improved estimators for Wilson loop expectation values can be defined. This is important because the Wilson loops are traditionally used to identify confining and Coulomb phases in gauge theories. Our study indicates that the spin-1/2 U(1) quantum link model is strongly coupled for all bare coupling values we examined. by Antonios S. Tsapalis. Ph.D. 179 leaves eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Physics Two topics in non-perturbative lattice field theories : the U(1) quantum link model and perfect actions for scalar theories 2 topics in non-perturbative lattice field theories U(1) quantum link model Perfect actions for scalar theories Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="a151ea39-0af1-4f25-ba4f-05680c118cf8"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Two topics in non-perturbative lattice field theories : the U(1) quantum link model and perfect actions for scalar theories</Title> <Subtitle>2 topics in non-perturbative lattice field theories</Subtitle> <Subtitle>U(1) quantum link model</Subtitle> <Subtitle>Perfect actions for scalar theories</Subtitle> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>1998</PublicationDate> <Authors> <Author> <DisplayName>Tsapalis, Antonios S., 1968-</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Physics</Keyword> <Abstract>This thesis deals with two topics in lattice field theories. In the first part we discuss aspects of renormalization group flow and non-perturbative improvement of actions for scalar theories regularized on a lattice. We construct a perfect action, an action which is free of lattice artifacts, for a given theory. It is shown how a good approximation to the perfect action - referred to as classically perfect - can be constructed based on a well-defined blocking scheme for the 0(3) non-linear o-model. We study the O(N) non-linear r-model in the large-N limit and derive analytically its perfect action. This action is applied to the 0(3) model on a square lattice. The Wolff cluster algorithm is used to simulate numerically the system. We perform scaling tests and discuss the scaling properties of the large-N inspired perfect action as opposed to the standard and the classically perfect action. In the second part we present a new formulation for a quantum field theory with Abelian gauge symmetry. A Hamiltonian is constructed on a four-dimensional Euclidean space-time lattice which is invariant under local transformations. The model is formulated as a 5-dimensional path integral of discrete variables. We argue that dimensional reduction will allow us to study the behavior of the standard compact U(1) gauge theory in 4-d. Based on the idea of the loop-cluster algorithm for quantum spins, we present the construction of a flux-cluster algorithm for the U(1) quantum link model for the spin-1/2 quantization of the electric flux. It is shown how improved estimators for Wilson loop expectation values can be defined. This is important because the Wilson loops are traditionally used to identify confining and Coulomb phases in gauge theories. Our study indicates that the spin-1/2 U(1) quantum link model is strongly coupled for all bare coupling values we examined.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>