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 17 of 17 for “"chiral symmetry breaking"”.
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
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 …
-
Functional Renormalization Group Methods in Quantum Chromodynamics
… in small volumes. A comparison of our results to chiral perturbation theory and lattice QCD suggests that lattice QCD has not yet reached volume sizes for which chiral perturbation theory can be applied to extrapolate lattice results for low-energy observables. Phase transitions in QCD at finite …
-
Mechanistic studies on the asymmetry amplifying, autocatalytic Soai reaction
The autocatalytic, asymmetry-amplifying alkylation of pyrimidine-5-carbaldehydes with diisopropylzinc, crowned as the ‘Soai reaction’, occupies a venerable position in organic chemistry. The transformation is peerless in its efficiency for asymmetric autocatalysis and sensitivity to initial chiral …
-
The instanton liquid and the axion
… susceptibility at zero temperature, in the chiral regime of physical quark masses. A numerical framework to derive interactions among the pseudo-particles is developed that is in principle exact, and is used to cure a pathology in the presently available finite temperature interactions. The …
-
Characteristic polynomials of random matrices and their role in an effective theory of strong interactions
… theory lead to random matrix ensembles named chiral Gaussian Unitary Ensemble (chGUE(N)) and extensions thereof. The random matrix ensembles are comparable to the effective theory of QCD in a low-energy regime, where chiral symmetry breaking is predominant and it suffices to consider only the …
-
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 …
-
Linear Sigma Models in QCD and S3 Symmetry for Neutrinos
… $p^2$, $p^4$ and $p^6$ seems to agree with chiral perturbation theory predictions. The model is then gauged to study the mass differences between the vector meson and the axial vector meson as a possibly useful "template" for the role of a light scalar in QCD as well as for (at a different …
-
Strongly coupled fermions on the lattice
… led to an understanding of quark confinement, chiral symmetry breaking and hadronic physics. Correlation functions of hadronic operators and scattering matrix of hadronic states can be calculated in terms of fundamental quark and gluon degrees of freedom. Since lattice QCD is the only …