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 33 for “"renormalisation"”.
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Renormalisation Group Flows in Lifshitz Holography
In this thesis we construct holographic duals of renormalisation group flows between field theories with conformal symmetries and the Lifshitz scaling symmetries. These take the form of spacetimes with a region asymptoting to AdS and another asymptoting to the Lifshitz metric of [1], with some …
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A Renormalisation Group Approach to the Hubbard Model
… dimensional Hubbard model with the aid of exact renormalisation group equations. For this purpose we rewrite the purely fermionic theory in a form where bosonic fields mediate the interaction between fermions. A symmetry breaking condensate then manifests itself in a nonvanishing expectation …
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Dimensionally Regulated On-Shell Renormalisation In QCD And QED
… is applicable to on-shell mass and wavefunction renormalisation. <br></br><br></br> After an extensive review of the relevant areas of renormalisation, and of the rôle of quark masses in current algebra, we go on to use the extended technique to extract the fermion mass and wavefunction …
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The Many Scales of Quantum Fields and Gravity
… Science. All thanks to the powerful tool of the Renormalisation Group. However, in the presence of gravity this becomes rather challenging as scales become outputs of the dynamics rather than inputs. This thesis covers several studies regarding this intersection, trying to understand the …
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Moments of parton distribution amplitudes and structure functions for the light mesons from lattice QCD
… the lattice calculation and the required renormalisation for the determination of two hadronic structure quantities. These are the parton distribution amplitudes (PDAs) which enter in the form-factor for exclusive scattering processes and the parton distribution functions (pdfs) that …
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Two-Dimensional Discrete Gaussian Model at High Temperature
… The goal of this thesis is to apply rigorous renormalisation group method to study the two-dimensional discrete Gaussian model in the delocalised phase, thereby obtaining central limit theorems in long-distance limit—in physics literature, the renormalisation group is a standard apparatus used …
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Fluctuations quantiques dans les systèmes à basse dimensionalité : théorie et applications aux conducteurs organiques
… commutantes et anticommutantes et le groupe de renormalisation pour rendre compte des différentes propriétés asymptotiques des corrélations à toutes les échelles de distance et de temps. Pour les systèmes purement unidimensionnels comme le gaz d'électrons et les systèmes électron-phonons, nous …
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Black holes and Berry's phase : some aspects of geometry in physics
… in black hole spacetimes. This brings us to the renormalisation of the stress- tensor via analytic methods. Finally, we draw on recent results to show how the Berry phase comes into play.
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The anomalous magnetic moment of baryons in cavity QCD
… are performed for massive quarks so a mass renormalisation scheme has been developed to cope with the new divergences this brings into the self-energy insert diagrams. The results of this work show that no improvement on the simple SU(3) model is made by including these corrections. These …
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Extreme values of non-Gaussian fields
… regularity estimates are established using renormalisation group and stochastic control techniques, in particular the Polchinski renormalisation group approach and the Bou$\acute e$-Dupuis variational formula.
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Corner Transfer Matrix approach to the Yang-Lee Singularity in the 2D Ising Model
… focus on the Ising scaling theory, general renormalisation arguments and conformal field theory (and the more modern logarithmic extensions) used to underpin our current understanding of the model. This thesis then details the theory and implementation details for the main numerical …
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Corner Transfer Matrix approach to the Yang-Lee Singularity in the 2D Ising Model
… focus on the Ising scaling theory, general renormalisation arguments and conformal field theory (and the more modern logarithmic extensions) used to underpin our current understanding of the model. This thesis then details the theory and implementation details for the main numerical …
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The Polyakov loop and its correlators in higher representations of SU(3) at finite temperature
… in SU(3) pure gauge theory. We have tested a new renormalisation procedure for the Polyakov loop and extracted the adjoint Polyakov loop below T_c, binding energy of the gluelump and string breaking distances. Moreover, we could show Casimir scaling for the Polyakov loop in different …
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The application of automated perturbation theory to lattice QCD
… staggered quark (HISQ) action. The renormalisation parameters of these actions cannot be feasibly determined by hand and thus automated procedures have been developed. In this dissertation I apply automated lattice pertubartion theory to a number of heavy quark calculations. I first …
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Coefficient d'absorption d'un système Peierls avec un gap fluctuatif
… compatible avec la théorie du groupe de renormalisation à la Kadanoff-Wilson. Il s'agit de reformuler la formule de Kubo pour la conductivité en termes des fonctions de Green de Zubarev. La partie réelle de la conductivité étant, à un facteur près, égale au coefficient d'absorption, nous …
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Antilinear deformations of Coxeter groups with application to Hamiltonian systems
… formulate a classical theory respecting the mass renormalisation of the quantum case.
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Decoherence effects in nonequilibrium transport through mesoscopic systems
… differential conductance. Second, analytical renormalisation group (RG) approaches are developed to study nonequilibrium transport through a quantum dot in the Kondo regime. Interactions within the quantum dot, which are essential for the occurrence of the Kondo effect, are taken into account …
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Individual differences in audiovisual integration and timing
… coherence. Instead, a new theory of temporal renormalisation is proposed, whereby the relative timing of audiovisual signals within different mechanisms is perceived relative to the average timing across mechanisms. Chapter 3 reveals that individual differences in audiovisual synchronisation …
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Phenomenology of the minimal <i>B - L</i> extension of the Standard Model at the LHC
… the unitarity bound and the constraints from the renormalisation group equations study. In the allowed region of the parameter space, we delineate the phenomenology of the Higgs bosons and we show characteristic signatures of the latter, at the LHC, involving the <i>Z'</i> boson and the heavy …
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Higher order and CP-violating effects in the neutralino and Higgs boson sectors of the MSSM
… MSSM with CP-violating parameters. An on-shell renormalisation scheme is developed for the chargino–neutralino sector that consistently takes into account imaginary parts arising from complex parameters and absorptive parts of loop integrals. The genuine vertex contributions are combined with …
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