Navegação Ciências Exatas e da Terra por Assunto "Fermions"
Resultados 1-12 de 12
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Coexistence and crossover phenomena in a Fermi-like model of particles in counterflowing streams
(2020) [Artigo de periódico]In this work, we propose a two-dimensional extension of a previously defined one-dimensional version of a model of particles in counterflowing streams, which considers an adapted Fermi-Dirac distribution to describe the ... -
Combined measurements of Higgs boson couplings in proton–proton collisions at √ s = 13 TeV
(2019) [Artigo de periódico]Combined measurements of the production and decay rates of the Higgs boson, as well as its couplings to vector bosons and fermions, are presented. The analysis uses the LHC proton–proton collision data set recorded with ... -
Coupling of fermions to the three-dimensional noncommutative CP/sup N-1/ model : minimal and supersymmetric extensions
(2004) [Artigo de periódico]We consider the coupling of fermions to the three-dimensional noncommutative CPN21 model. In the case of minimal coupling, although the infrared behavior of the gauge sector is improved, there are dangerous ~quadratic! ... -
Dynamics of spin and density fluctuations in strongly interacting few-body systems
(2019) [Artigo de periódico]The decoupling of spin and density dynamics is a remarkable feature of quantum one-dimensional many-body systems. In a few-body regime, however, little is known about this phenomenon. To address this problem, we study the ... -
Phase diagram of the heavy fermion system YbFe/sub 2/Ge/sub 2/ under pressure
(2006) [Artigo de periódico]The phase diagram of the heavy fermion compound YbFe2Ge2 under high pressures P ≤ 18.2 GPa was obtained by electrical resistivity measurements. Pressure drives the system from a paramagnetic Fermi liquid state to a ... -
Quantum spin glass : a replica-symmetric theory with positive entropy
(1986) [Artigo de periódico]In the present paper we present a detailed analysis of quantum effects in the spin-glass transition as described by a quantum Heisenberg analogue of the Sherrington-Kirkpatrick model. The spin operators are represented in ... -
Saturating field configurations for the massless thirring-wess model
(1979) [Artigo de periódico]The saturation of the massless Thirring-Wess model by induced field configurations is presented. The limiting procedure connecting the massless Thirring-Wess model arith the Schwinger model is reexamined. Special emphasis ... -
Saturation of the massive Schwinger model
(1980) [Artigo de periódico]We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ... -
The low energy limit of the non-commutative Wess-Zumino model
(2002) [Artigo de periódico]The non-commutative Wess-Zumino model is used as a prototype for studying the low energy behavior of a renormalizable non-commutative field theory. We start by deriving the potentials mediating the fermion-fermion and ... -
Two scenarios for superconductivity in CeRh2As2
(2021) [Artigo de periódico]CeRh2As2, a nonsymmorphic heavy fermion material, was recently reported to host a remarkable temperature versus z-axis magnetic-field phase diagram with two superconducting phases. In this material, the two inequivalent ... -
Underscreened Kondo lattice model applied to heavy fermion uranium compounds
(2007) [Artigo de periódico]We present theoretical results for the underscreened Kondo lattice model with localized S=1 spins coupled to a conduction band through a Kondo coupling, JK, and interacting among them ferromagnetically. We use a fermionic ... -
Weak instability of frustated fermionic models
(1997) [Artigo de periódico]We study the Almeida-Thouless instability of two fermionic models analogous to spin glasses that exhibit frustration and that were solved some time ago with a replica symmetric ansatz. In the first model (I) we consider ...
