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Showing 1 to 9 of 9 for “"renormalization group equations"”.
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Aspects of Non-Perturbative Renormalization
… some key issues regarding the non-perturbative renormalization of the periodic scalar field theories. As an example of the non-perturbative methods, we use the differential renormalization group approach, particularly the Wegner-Houghton and the Polchinski renormalization group equations, in …
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Symmetry breaking in the Hubbard model : a bosonization approach
… is conveniently carried out by means of exact renormalization group equations that we apply in the formalism of the effective average action. For this purpose, we derive an equivalent version of the Hubbard model that takes the form of a Yukawa theory. From this modified model long range order …
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Aspects of the Ising and tricritical Ising models
… is concerned with the derivation of differential equations for the critical four-point function in the Ising model. We <br/>present a method which provides the well-known standard solutions by a new and efficient route. The second part of the thesis is concerned with off-critical behaviour, and in …
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The BCS - BEC Crossover in Ultracold Fermion Gases
… via the solution of suitable Schwinger-Dyson equations. The phase diagram is computed, and a variety of universal features are established. A new form of crossover from an exactly solvable narrow resonance limit to broad resonances or pointlike interactions is found. At low temperature our …
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Effective Actions for Strongly Interacting Fermionic Systems
… techniques beyond perturbation theory and renormalization group equations. Improvement comes from a description with BBS fields and elementary fields treated on equal footing. Yet, ``partial bosonization'' introduces an arbitrariness as the choice for the composite fields is usually not …
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Topics in quantum field theory and holography
… infinite jet bundles, and then interpreting the renormalization group equations for single-trace deformations as Hamilton's equations of motion on a one-higher dimensional emergent spacetime. We evaluate the resulting bulk on-shell action explicitly, and show that it reproduces all the …
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Limits of QCD
… exchange, we derive the first closed-form renormalization group equations for Regge cut contributions in several nontrivial t-channel color representations, providing a systematic method for organizing non-planar QCD amplitudes at high energy.
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Studies in: entanglement entropy of two dimensional quasi-topological quantum field theory and geometry of the exact renormalization group and higher spin holography
… are in agreement. Part II: Geometry of the Exact Renormalization Group and Higher Spin Holography We consider the Wilson-Polchinski exact renormalization group (RG) applied to the generating functional of single-trace operators at a free-fixed point in d = 2 + 1 dimensions. By exploiting the rich …
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SUSY Seesaw model and phenomenological implications for leptonic processes at low energies and leptogenesis
In this work the supersymmetric seesaw model and its effects on low-energy leptonic observables and thermal leptogenesis have been systematically investigated. Precision measurements will increase the sensitivity on lepton-flavor violating decays, particularly on Br(l_j->l_i gamma) and also on …