Spelling suggestions: "subject:"field 1heory"" "subject:"field atheory""
41 |
Aspects of the affine superalgebra sl(2|1) at fractional levelJohnstone, Gavin Balfour January 2001 (has links)
Aspects of the Affine Superalgebra sl(2|l) at Fractional Level Ph.D. Thesis by Gavin Balfour Johnstone, April 2001 In this thesis we study the affine superalgebra sl(2|l; C) at fractional levels of the form k = l/u-l,uєN\{l}. It is for these levels that admissible representations exist, which transform into each other under modular transformations. In the second chapter we review background material on conformal field theory, particularly the Wess-Zumino-Witten model and the connection with modular transformations. The superalgebra sl(2|l;C) is introduced, as is its affine version. The next chapter studies the modular transformation properties of sl(2|l;C) characters. We derive formulae for these transformations for all levels of the form K = 1/u-1,uєN\{1}. We also investigate some modular invariant combinations of characters and find two series of modular invariants, analogous to the A- and D-series of the classification of sl{2) modular invariants. In chapter 4 we turn to the study of fusion rules. We concentrate on the case k = -1/2. By considering the decoupling of singular vectors, we are able to find consistent fusion rules for this particular level. These fusion rules correspond to a modular invariant found in chapter 3. This study suggests that one may consistently define a conformal field theory based on sl(2|l;C) at fractional level.
|
42 |
Survey of some developments in the Gross-Neveu modelTrudeau-Reeves, Pierre January 1983 (has links)
No description available.
|
43 |
On a class of completely integrable classical field theoriesDavid, Daniel. January 1982 (has links)
No description available.
|
44 |
Investigation of differentially diffusing scalars in isotropic decaying turbulence /Nilsen, Vebjorn. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (p. [85]-89).
|
45 |
The philosophical significance of unitarily inequivalent representations in quantum field theoryLupher, Tracy Alexander. January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
|
46 |
Self-consistent-field calculations techniques and applications /Lewchenko, Victor. January 1981 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
|
47 |
Sur l'interaction du rayonnement avec la matière en théorie des champs quantifiésBouvier, Pierre. January 1947 (has links)
Thèse--Genève. / Bibliographical footnotes.
|
48 |
Novel approaches to numerical solutions of quantum field theories /Petrov, Dmitri. January 2005 (has links)
Thesis (Ph.D.)--Brown University, 2005. / Vita. Thesis advisor: S. G. Guralnik. Includes bibliographical references (leaves 117-118). Also available online.
|
49 |
Quantization of some generally covariant model field theoriesWan, Kong K. January 1971 (has links)
This thesis reports a study of the quantization of generally covariant and nonlinear field theories. It begins by reviewing some existing general theories in Chapter 2 and Chapter 3, Chapter 2 deals with general classical theories while Chapter 3 examines various quantization schemes. The model field derived from the Lagrangian density ℓ = 1/4 ℇ[super]lkμλ (A [sub] k,t – A [sub] k,t)(A, {sub{ A[sub]μ,λ – A[sub]λ,μ). is proposed in Chapter 4 especially for the study of general covariance. It is demonstrated that for this field general covariance alone does not appear to bring in anything physically new, a discussion is given on the differences between general covariance and Lorentz covariance. In subsequent chapters a generally covariant and nonlinear model field, a 4-surface of stationary 4-volume embedded in a 5-dimensional Pseudo-Euclidean space, is investigated. Firstly a manifestly covariant quantization programme is carried out. The model field is then examined in a special coordinate frame for the study of its nonlinearity. Various treatments of the intrinsic nonlinearity are examined starting with conventional perturbation theory in Chapter 6. The usual divergence problem in quantum field theory appears, in particular in the self-energy calculation of a one-particle state. A new variational method is proposed in Chapter 8 which is able to lead to finite results for one-particle states. The thesis is concluded with a chapter discussing some general problems involved and a chapter containing suggestions for further work.
|
50 |
A cosmological field theoryStarkovich, Steven Paul 04 July 2018 (has links)
Field theory is used to describe the material content of the universe throughout
its entire history, and an oscillating cosmological model without a singularity
is presented. In our theory, the “cosmological fluid” is described by a classical
scalar field that undergoes a series of phase transitions over the lifetime of the
universe. Each transition corresponds to a discontinuous change in the equation
of state of the field. In general, for an FRW universe and a given equation of
state, we show that the field potential V(Φ) may be derived from the solution of
Piccati’s equation. The resulting expression for V(Φ) includes parameters whose
values are determined from the boundary conditions. In our theory, we employ the
standard cosmological model and the fundamental Planck quantities to provide
these boundary conditions. We thereby determine the scalar field Lagrangian for
the entire history of the universe. The resulting cosmological model is free of any
singularities, and includes an early inflationary epoch. Inflation arises in our theory
as a consequence of the initial conditions. The theory describes a universe that
is very cold at its minimum radius, although it heats rapidly during the initial inflationary
era. This increase in the temperature of the scalar field during inflation
is a direct consequence of applying classical thermodynamics under the assumed
conditions for the early universe, and does not depend on the fine-tuning of free
parameters. Inflation continues until a maximum possible physical temperature
(the Planck temperature) is attained, at which point a phase transition occurs
and the standard model era begins. By relating the temperature of the scalar
field in our theory to the radiation temperature in the standard model universe,
it is possible to establish a thermodynamic constraint on a more complete theory
of matter for the early universe. Although, in principle, inflation occurs for any
equation of state where p < -(1/3)p, we find that the initial equation of state
must be p ≈ -p if the later epochs of the universe are to resemble the standard
model. In particular, we find that Ho = 33 - 44 km sec-1 Mpc-1 is the value
of the Hubble parameter a t the current epoch that is least sensitive to the initial
equation of state. / Graduate
|
Page generated in 0.0296 seconds