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Model Study of the Deconfining Phase Transition

Title: A Model Study of the Deconfining Phase Transition.
Name(s): Velytsky, Alexander, author
Berg, Bernd A., professor directing thesis
Riccardi, Gregory A., outside committee member
Heller, Urs M., committee member
Hagopian, Vasken, committee member
Rikvold, Per Arne, committee member
Department of Physics, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2004
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The study of the deconfining phase transition or crossover is important for the understanding of properties of nuclear matter and the quark gluon plasma. Heavy ion collisions experiments are capable of creating conditions necessary for deconfinement. The dynamics of this process and not only its equilibrium properties are of interest. In this dissertation nonequilibrium aspects of rapid heating and cooling of the QCD vacuum are studied in a model framework. The 3-D Potts model with an external magnetic field is an effective model of QCD (of pure SU(3) gauge theory, when the magnetic field is set to zero), which we study by means of Monte Carlo simulations. Other models are used to understand the influence of the strength of the phase transition. In our investigations these systems are temperature driven through a phase transition or a rapid crossover using updating procedures in the Glauber universality class. We study hysteresis cycles with different updating speeds and simulations of a quench. Qualitatively this should reveal the physics of non-equilibrium configurations. A number of observables are measured during the simulations: thermodynamical quantities such as the internal energy and the magnetization, properties of Fortuin-Kasteleyn clusters and structure functions. Comparing with equilibrium data we conclude that the Monte Carlo dynamics is capable of creating a spinodal decomposition, which dominates the statistical properties of configurations. A slowing down of the equilibration in the ordered phase due to the competition of different magnetization domains is observed. This could lead to a situation where the system does not fully equilibrate in the available time. Spinodal decomposition of the Polyakov loops may lead to an enhancement of low momentum degrees of freedom. If this scenario is realized by Nature, this may be observed in experiments as an increase in the low energy gluon production.
Identifier: FSU_migr_etd-4574 (IID)
Submitted Note: A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Spring Semester, 2004.
Date of Defense: April 12, 2004.
Keywords: Quark Gluon Plasma, Lattice Gauge Theory, Spin Models
Bibliography Note: Includes bibliographical references.
Advisory Committee: Bernd A. Berg, Professor Directing Thesis; Gregory A. Riccardi, Outside Committee Member; Urs M. Heller, Committee Member; Vasken Hagopian, Committee Member; Per Arne Rikvold, Committee Member.
Subject(s): Physics
Persistent Link to This Record:
Owner Institution: FSU

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Velytsky, A. (2004). A Model Study of the Deconfining Phase Transition. Retrieved from