Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"nonperturbative"”.
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Nonperturbative QCD calculations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Nonperturbative aspects of kaon structure
In this thesis we have studied the structure of the kaon using the Nambu-Jona-Lasinio (NJL) model with the proper-time regularisation scheme to simulate the effect of quark confinement. The separate contributions of each flavour to the elastic form factor are calculated with and without the effect …
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Nonperturbative renormalization in classical φ4 theory
This is an in-depth study of two analytic nonperturbative renormalization group methods used to study nonrelativistic quartic interacting systems. The model studied is that of classical real scalar φ4 theory. A variety of techniques are used including a rescaling of a nonlinear complete basis, a …
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Aspects of Nonperturbative Heavy Quark Physics
… these EFTs in a lattice regularisation, nonperturbative calculations of observables of interest become possible. This thesis presents progress towards systematically controlled calculations of two such observables: the Spectator Effect contributions to the inclusive decay rates of …
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Electroweak Calculations In The Presence Of Nonperturbative Qcd Effects
… using the quark condensate component of the nonperturbative vacuum expectation value of the two nonlocal normal ordered quark fields. The lowest-order quark condensate component of the QCD nonperturbative quark self-energy is calculated, leading to a gauge independent dynamical component for …
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Nonperturbative dynamics of strong interactions from gauge/gravity duality
… However, for low energies QCD enters into the nonperturbative regime, where different analytical or numerical tools have to be applied to solve problems of strong interactions. The holographic dual model of QCD is such an analytical tool that allows one to solve some nonperturbative QCD …
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Geometrical and nonperturbative aspects of low dimensional field theories
We present a collection of results on solitons in low-dimensional classical field theory. We begin by reviewing the geometrical setting of he nonlinear ơ-model and demonstrate the integrability of the theory in two-dimensions on a symmetric target manifold. After reviewing the construction of …
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Nonperturbative quark mass and coupling renormalization in two flavor QCD.
Nonperturbative bare quark mass and coupling renormalization is studied for two flavor quantum chromodynamics (QCD). In particular, the β function for the case of Kogut-Susskind quarks is determined over the parameter space of existing lattice (spectrum) simulations from the existing spectrum data. …
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Soft diffractive high energy scattering and form factors in nonperturbative QCD
… soft high energy reactions in the framework of nonperturbative models. Using a functional integral approach we derive the scattering amplitudes, which are governed by expectation values of light-like Wegner-Wilson loops and lines, which then are then evaluated in the model of the stochastic …
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Aspects of the nonperturbative dynamics of supersymmetric gauge theories and strings
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Probing the Nonperturbative Physics of QCD with Normalizing Flows and a moderate number of Pions
… improvable ab-initio method for accessing the nonperturbative physics of QCD is Lattice QCD is, and this thesis presents two advances in our understanding QCD using lattice-based methods. The first is a calculation using many-pion systems to map out the entire zero temperature, nonzero isospin …
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Nonperturbative study of SU(N) Yang–Mills theory with gauge invariant condensates of mass dimension two
… condensate has turned out to be essential for a nonperturbative study of the vacuum of these theories, and it has already been studied from several points of view in the literature. This condensate gives the gluon an effective mass, offering a much needed solution to many a low-energy problem. It …
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Hadronic Structure with Classical and Quantum Computing
… to describe the strong nuclear force in the nonperturbative regime from first principles — are playing an increasingly important role in revealing how hadrons emerge from the interactions of the underlying degrees of freedom: quarks and gluons. With computational and theoretical advances, …
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A Charcuterie Platter of QCD Matter
… structure of QCD: What can we learn about the nonperturbative structure of the quantum field theory through the abstruse emergent phenomenon in QCD called “confinement”, which traps quarks and gluons inside hadrons? I study a class of cleverly constructed observables known as energy correlators …
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Properties of mesons and quarks under extreme conditions from Gauge-Gravity duality
… study the width of these mesons by exploiting nonperturbative string effects which can destabilize them, a result we attribute on the gauge theory side to thermal fluctuations. We show that the lifetime of these mesons, described via nonperturbative string effects, decreases rapidly above the …
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Resummation in Deep Inelastic Scattering
… process, perturbation theory breaks down, and nonperturbative QCD interactions cannot be ignored. Therefore, new techniques are needed to compute cross sections. Resummation is the process in which the perturbative series in the cross section is reordered and then resummed to give a prediction …
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Static and dynamic properties of the pion from continuum modelling of strong QCD
We present nonperturbative numerical solutions for the quark propagator Schwinger-Dyson equation (SDE) and pseudoscalar meson Bethe-Salpeter equation (BSE) at and beyond the rainbow-ladder truncation level of this system of equations. We solve this coupled system of integral equations using a …
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On extended supersymmetry in two and four dimensions.
… compared in the light of perturbative as well as nonperturbative aspects of the theories in question. Then we discuss four dimensional supersymmetric gauge theories in presence of an Omega background { a special deformation used in localization of path integrals of supersymmetric theories. Instead …
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Partonic rescatterings during jet fragmentation in the QCD vacuum
… is generally separated into perturbative and nonperturbative energy regimes. Many of the interesting phenomena in QCD, including collectivity, are partially or entirely in the nonperturbative regime and present theoretical challenges. Experimental efforts therefore become an essential tool to …
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Heavy quark physics on the lattice with improved nonrelativistic actions
… results with theoretical predictions, nonperturbative calculations of hadronic matrix elements within the theory of quantum chromodymanics are required. Such calculations can be performed from first principles by formulating QCD on a Euclidean spacetime grid and computing the path …
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