Generalized Pions in Dense QCD
نویسندگان
چکیده
QCD superconductors in the color-flavor-locked (CFL) phase sustain light Goldstone modes (that will be referred to as generalized pions) that can be described as pairs of particle and/or hole excitations around a gapped Fermi surface. In weak coupling and to leading logarithm accuracy, their form factor, mass and decay constant can be evaluated exactly. These modes are found to satisfy an axial-Ward-identity, leading to a simple mass formula.
منابع مشابه
Application of chiral quarks to high-energy processes and lattice QCD
Results of the chiral quark models for the soft matrix elements involving pions and photons, relevant for high-energy processes, are reviewed. We discuss quantities related to the generalized parton distributions of the pion: the parton distribution functions, the parton distribution amplitudes, and the generalized form factors. The model predictions are compared to the data or lattice simulati...
متن کاملBose-Einstein condensation in dense quark matter
We consider the problem of Bose condensation of charged pions in QCD at finite isospin chemical potential μI using the O(4)-symmetric linear sigma model as an effective field theory for twoflavor QCD. Using the 2PI 1/N-expansion, we determine the quasiparticle masses as well as the pion and chiral condensates as a function of the temperature and isospin chemical potential in the chiral limit an...
متن کاملHidden Local Symmetry and the Vector Manifestation of Chiral Symmetry in Hot and/or Dense Matter
The emergence and importance of hidden local symmetry in the structure of hadrons under extreme conditions is discussed. The topics covered are the potentially important role played by an infinite tower of vector mesons encoded in holographic dual QCD (or AdS/QCD) in chiral dynamics of mesons and baryons, in the vector dominance and its violation in EW response functions and the presence of the...
متن کاملar X iv : h ep - p h / 01 07 14 6 v 1 1 3 Ju l 2 00 1 1 Hadronic and Quark - Gluon Excitations of Dense and Hot Matter ∗
We summarize recent developments in our understanding of low-mass quark-antiquark excitations in hadronic matter under various different conditions. This includes the ther-modynamics of the chiral condensate, pions as Goldstone bosons in normal nuclear matter, and excursions into extreme territory of the QCD phase diagram: lepton pair production from a fireball expanding through the transition ...
متن کاملLeading chiral contributions to the spin structure of the proton.
The leading chiral contributions to the quark and gluon components of the proton spin are calculated using heavy-baryon chiral perturbation theory. Similar calculations are done for the moments of the generalized parton distributions relevant to the quark and gluon angular momentum densities. These results provide useful insight into the role of pions in the spin structure of the nucleon and ca...
متن کامل