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dc.contributor.advisorUwe-Jens Wiese.en_US
dc.contributor.authorTsapalis, Antonios S., 1968-en_US
dc.date.accessioned2009-10-01T15:33:21Z
dc.date.available2009-10-01T15:33:21Z
dc.date.copyright1998en_US
dc.date.issued1998en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/47700
dc.descriptionThesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.en_US
dc.descriptionIncludes bibliographical references (leaves 175-179).en_US
dc.description.abstractThis 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.en_US
dc.description.statementofresponsibilityby Antonios S. Tsapalis.en_US
dc.format.extent179 leavesen_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.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.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectPhysicsen_US
dc.titleTwo topics in non-perturbative lattice field theories : the U(1) quantum link model and perfect actions for scalar theoriesen_US
dc.title.alternative2 topics in non-perturbative lattice field theoriesen_US
dc.title.alternativeU(1) quantum link modelen_US
dc.title.alternativePerfect actions for scalar theoriesen_US
dc.typeThesisen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.identifier.oclc42284780en_US


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