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.
Results
Showing 1 to 11 of 11 for “"functional renormalization group"”.
-
Functional Renormalization Group Methods in Quantum Chromodynamics
We apply functional Renormalization Group methods to Quantum Chromodynamics (QCD). First we calculate the mass shift for the pion in a finite volume in the framework of the quark-meson model. In particular, we investigate the importance of quark effects. As in lattice gauge theory, we find that the …
-
Functional renormalization group studies of quantum transport through mesoscopic systems
… A successful approach may then be given by renormalization group (RG) methods which are based on the idea of treating energy scales successively from high to low. In the functional RG (fRG) an exact infinite hierarchy of flow equations for multi-particle Green or vertex functions is derived, …
-
The functional renormalization group for zero-dimensional quantum systems in and out of equilibrium
… properties of quantum impurity systems using the functional renormalization group. The latter is an RG-based diagrammatic tool to treat Coulomb interactions in a fast and flexible way. Prior applications, which employed a simple first-order (Hartree-Fock-like) scheme to truncate the FRG flow …
-
Classical diffusion of a particle in a one dimensional random potential
… correlations. To solve the problem we use the renormalization and functional renormalization group techniques in an attempt to re-create known results in an effort to find a general method that can deal with such one-dimensional systems. We calculate the particles distribution function using a …
-
The BCS - BEC Crossover in Ultracold Fermion Gases
… Mean Field Theory. We develop a systematic functional integral approach for the description of this phenomenon. Starting from a Yukawa-type atom-molecule model, a symmetry analysis allows to both construct the equation of state and to classify the thermodynamic phases in a unified way. The …
-
Low-Energy Effective Field Theories for the Antiferromagnetic Quantum Critical Metal with Z2, O(2) and O(3) spin symmetries
… O(2) and O(3) theories, respectively. The slow renormalization group (RG) flows of c and v to their fixed point values create approximate scale invariance controlled by approximate marginal parameters within finite but large windows of energy scales. The manifold of those quasi-fixed points and …
-
Asymptotically Safe Gravity: from spacetime foliation to cosmology
… Fixed Point (NGFP) of the underlying renormalization group flow. The high-energy modifications of gravity resulting from the scaling of couplings around the NGFP may have profound implications in astrophysics and cosmology. The Functional Renormalization Group (FRG) constitutes an …
-
Kondo effect out of equilibrium
… dot in the Kondo regime using the real time renormalization group (RTRG) method. This method is a functional renormalization group (RG) method allowing a non-perturbative description of correlated systems in non-equilibrium. For the Kondo quantum dot the method is generalized to the case of …
-
Studio di modelli efficaci per la Cromodinamica quantistica per mezzo del Gruppo di rinormalizzazione funzionale
In questa tesi ci concentriamo sull'applicazione del Gruppo di Rinormalizzazione Funzionale (FRG) non perturbativo, per studiare il comportamento critico delle teorie di campo efficaci, con l'obiettivo finale di comprendere le proprietà critiche della Cromodinamica Quantistica (QCD) e in …