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 44 for “"Scattering amplitudes"”.
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Calculations of three-body scattering amplitudes
… two techniques for the calculation of threebody scattering amplitudes. The first is a variational principle based on the Faddeev equations. In form it resembles a Schwinger principle. The wave functions that are varied are products of the two-body potentials and the normal three-body wave …
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Scattering Amplitudes in Confining Theories and Holography
… en el desarrollo de un método para calcular amplitudes de dispersión en teorías confinantes con duales holográficos mediante la correspondencia AdS/CFT. Estas teorías confinantes presentan un ‘’mas gap’’ y un espectro de masas discreto.
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Unitarizing high-energy scattering amplitudes in Yang-Mills theory
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Mathematics.
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Existence and analyticity of many body scattering amplitudes at low energies
… elastic and inelastic (2 cluster) - (2 cluster) scattering amplitudes for N-body quantum systems. For potentials falling off like r⁻<sup>-1-E</sup> we prove that below the lowest 3-cluster threshold these amplitudes exist, are continuous and that asymptotic completeness holds. Moreover, if …
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High energy scattering amplitudes of Yang-Mills theory in the eighth order
Thesis. 1977. Sc.D.--Massachusetts Institute of Technology. Dept. of Physics.
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The gravity of modern amplitudes: using on-shell scattering amplitudes to probe gravity
In this thesis, we explore the use of on-shell scattering amplitudes as a way to understand various gravitational phenomena. We show that amplitudes are a viable way of studying certain aspects of gravity and showcase three such novel results here. First is the computation of the deflection angle …
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Nucleon-Nucleon Spin Dependent Scattering Amplitudes to Describe Final State Interactions in Electromagnetic and Electroweak Nuclear Processes
… that provide nucleon-nucleon spin dependent scattering amplitudes at high energies (<em> s</em> ≥ 6 GeV<sup>2)</sup>. This work aims to provide a model for calculating these high-energy scattering amplitudes. The foundation of the model is Regge theory since it allows for a relativistic …
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Exotic charm resonances and coupled-channel scattering from lattice QCD
… these charmed resonances through coupled-channel scattering amplitudes, determined from lattice QCD, and work with an enhanced $SU(3)_f$ flavour symmetry where the up, down, and strange quark masses are all equal. This symmetry enables us to discern the hadronic content in these sectors, and the …
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Spectroscopy of exotic charm mesons from lattice QCD
… how to relate the lattice QCD spectrum to the scattering amplitudes and perform a calculation of elastic $DK$ scattering amplitudes which is relevant for the exotic $D_{s0}(2317)$. By analytically continuing the scattering amplitudes into the complex plane, I find a bound state pole near …
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Soft diffractive high energy scattering and form factors in nonperturbative QCD
… 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 vacuum. We describe mesons in a simple quark-antiquark picture, for baryons we …
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Worldsheet methods for perturbative quantum field theory
… the study of the ambitwistor string and the scattering equations, while the second concerns the interplay of the symmetries of the asymptotic null boundary of Minkowski space, called $\scri$, and scattering amplitudes. The first part begins with a review of the CHY formulas for scattering …
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The scattering of spinning hadrons from lattice QCD
… In this thesis, I will present the results of scattering calculations featuring mesons with non-zero intrinsic spin. Before doing so, I will first give a brief introduction to QCD and review the framework necessary to perform lattice QCD calculations in Chapters 1 and 2. In Chapter 3, I present …
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ΔΙΑΔΟΣΗ ΤΑΣΙΚΩΝ ΚΥΜΑΤΩΝ ΣΕ ΣΥΝΘΕΤΑ ΥΛΙΚΑ ΚΑΙ ΠΡΟΣΔΙΟΡΙΣΜΟΣ ΤΩΝ ΔΥΝΑΜΙΚΩΝ ΤΟΥΣ ΙΔΙΟΤΗΤΩΝ
… MATERIALS" HAVE BEEN DEVELOPED THE LOW-FREQUENCY SCATTERING THEORY OF ELASTIC WAVES BY A PENETRABLE SCATTERER WITH A PENETRABLE CORE. ANALYTICAL EXPANTIONS FOR THE SCATTERING AMPLITUDES AND FOR THE SCATTERING CROSS-SECTION HAVE ALSO BEEN DERIVED. USING THE SCATTERING CROSS-SECTION THE DYNAMIC …
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Aspects of amplitudes, gravity & complexity
… two aspects of modern theoretical physics: scattering amplitudes in gravitational theories and entanglement entropy & complexity in quantum field theory. In part one, we utilise modern scattering amplitude techniques to efficiently calculate the deflection angle of both light and gravity due …
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Causality and unitarity in the early universe
… insights, it is essential to adapt tools from scattering amplitudes and open quantum systems to cosmology and to understand how fundamental principles shape cosmological correlators. This thesis examines some of the outcomes of this effort. The first three chapters are an introduction to …
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The propagator for graviton modes in supergravity on ADS5 x S5
… could be useful in calculations of four-leg scattering amplitudes as a further test of the proposed holographic duality between SUGRA on AdSd and the conformal field theory (CFT) on the (d - 1)-dimensional boundary of AdS d. The propagator is a symmetric bitensor and thus can be written as a …
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Numerical study of Regge cuts due to absorption in neutral pion photoproduction
… expressions commonly used to calculate absorbed scattering amplitudes and their relation to Regge cut parametrizations. The physical picture behind the derivations is that absorbed Regge scattering is the result of secondary scattering of the products of the pure Regge exchange so that particles …
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On the super Mumford form in the presence of Ramond and Neveu-Schwarz punctures
… used to create a measure whose integral computes scattering amplitudes of superstring theory. We express it in terms of local bases of global sections of tensor powers of the Berezinian line bundle of a family of super Riemann surfaces.
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