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Showing 1 to 20 of 38 for “"Chiral Symmetry"”.
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Chiral symmetry breaking transitions in holographic duals
… of the AdS/CFT Correspondence are used to study chiral symmetry breaking in dual gauge theories. We use the D3/D7 and D3/D5 systems to model both 3+1 and 2+1 dimensional, strongly coupled, gauge theories with quark fields. We show that chiral symmetry breaking is induced by either an imposed …
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Aspects of Chiral Symmetry Breaking in Gauge Field Theories
… thesis we study the mechanisms of spontaneous chiral symmetry breaking in gauge field theories. We focus on the general relationship between dynamical mass generation and the formation of bound states in theories not having elementary scalars. In that context we demonstrate that the …
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Aspects of chiral symmetry breaking in gauge field theories
… thesis we study the mechanisms of spontaneous chiral symmetry breaking in gauge field theories. We focus on the general relationship between dynamical mass generation and the formation of bound states in theories not having elementary scalars. In that context we demonstrate that the …
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Chiral symmetry breaking and external fields in the Kuperstein-Sonnenschein model
A novel holographic model of chiral symmetry breaking has been proposed by Kuperstein and Sonnenschein by embedding non-supersymmetric probe D7 and anti-D7 branes in the Klebanov-Witten background. We study the dynamics of the probe flavours in this model in the presence of finite temperature and a …
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Chiral symmetry restoration in the three-dimensional four-fermion model at non-zero temperature and density
… three-dimensional four-fermion model with a Z2 chiral symmetry at non-zero temperature Tor non-zero chemical potential μ is investigated. The main purpose of the study is to serve as an orientation for the more complex problem of the chiral phase transition in Quantum Chromodynamics. It is shown …
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Spatial Structure of the Composite Particles in the 2 + 1 Dimensional U(1) Four-Fermi Model at Finite Chemical Potential
I examined the chiral phase transition in a 2 + 1 dimensional, U(1) symmetric, four-fermi model at finite chemical potential and zero temperature. The spatial structure (form factor) of the composite particle formed as a result of the breaking of the chiral symmetry is calculated under the 1/N …
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Spatial structure of the composite particles in the 2+1 dimensional U(1) four-fermi model at finite chemical potential
I examined the chiral phase transition in a 2 + 1 dimensional, U(1) symmetric, four-fermi model at finite chemical potential and zero temperature. The spatial structure (form factor) of the composite particle formed as a result of the breaking of the chiral symmetry is calculated under the 1/N …
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In-Medium QCD Sum Rules for omega Meson, Nucleon and D Meson
… The behavior of four-quark condensates under the chiral symmetry group and the relation to order parameters of spontaneous chiral symmetry breaking are outlined. In this respect, also the QCD condensates appearing in differences of sum rules of chiral partners are investigated. Finally, the …
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Composite models of quarks and leptons
… and leptons. Some dynamical mechanisms for chiral symmetry breaking in chiral preon models are discussed. We have constructed several "realistic candidate" chiral preon models satisfying complementarity between the Higgs and confining phases. The models predict three to four generations of …
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Dynamics of Chiral Fermions
… containing Weyl fermions respecting some chiral symmetry. There are severe challenges in lattice regularising such theories and chiral gauge theories, where a non-anomolous chiral symmetry is gauged, can display interesting strong coupling dynamics such as confinement without chiral …
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Cold, dense quark matter
… we study effective quark models, the symmetry pattern of different quark matter phases, the collective modes associated with spontaneous chiral symmetry breaking, a possible realization of quark-hadron continuity in the color-flavor locked (CFL) quark superfluid, and the implications …
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Photon Statistics in Disordered Lattices
… disorders. The latter exhibits disorder-immune chiral symmetry -- the appearance of the eigenmodes in skew-symmetric pairs and the corresponding eigenvalues in opposite signs. When a disordered photonic lattice, an array of evanescently coupled waveguides, is illuminated with an extended …
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A study of the chiral phase transition in the nonlinear sigma model
The finite temperature chiral phase transition is studied using the three dimensional non-linear sigma model. Numerical simulations with the U(N) $\times$ U(N) and SU(N) $\times$ SU(N) flavor symmetries for both two and three flavors were examined to determine the order of the phase transition. The …
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A study of the chiral phase transition in the non-linear sigma model
The finite temperature chiral phase transition is studied using the three dimensional nonlinear sigma model. Numerical simulations with the U(N) x U(N) and SU(N) x SU(N) flavor symmetries for both two and three flavors were examined to determine the order of the phase transition. The data from the …
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Phase transitions in lattice gauge theories
… of QCD are reviewed, including the broken chiral symmetry of the QCD vacuum state. The current understanding of the deconfining and chiral symmetry restoring transitions at non-zero temperature and density is then summarized. The use of a four-fermion coupling as an improved extrapolation …
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Strong coupling methods for lattice QCD
… and covered in the attached papers are (1) chiral symmetry breaking and its restoration at zero temperature for a large number of flavors, (2) the QCD phase diagram, in particular the location of the chiral/nuclear critical endpoint, (3) bulk thermodynamics and (4) Hamiltonian formulation …
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Measurement of Pion-Pion Final State Interactions in η → π +π −γ with CLAS at Jefferson Lab
<p>Decays of pseudoscalar mesons proceed from the chiral anomaly, which arises from spontaneous chiral symmetry breaking. In the limit of massless quarks (chiral limit), the η → π +π −γ the decay width is determined solely by the box anomaly term in the Wess Zumino Witten Lagrangian. Since the …
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Confinement and Chiral Phase Transitions in SU(2) Gauge Theory via Topological Objects
Confinement and chiral phase transitions are remarkable non-perturbative phenomena emerging from Quantum Chromodynamics, that is, the underlying theory of the strong interaction between subatomic particles. A theoretical understanding of these transitions and their interrelations is of fundamental …
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Lowest Q² measurement of the [gamma] *p [right arrow] [Delta] reaction : probing the pionic contribution
… C2) which indicate a deviation from spherical symmetry. The quark models using the color hyperfine interaction underestimate the size of the quadrupole terms by more than an order of magnitude. Models using the pion cloud do a much better job of describing the data. This is expected due to the …
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Quantum Chromodynamics with Eight and Twelve Degenerate Quark Flavors on the Lattice
… expected from a theory with spontaneously broken chiral symmetry. The strongest supporting evidence is the linearity of mÏ€2 ∠mq at zero temperatures and the existence of a chiral symmetry restoring transition at finite temperatures. We note that other lattice simulations, also exploring the …
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