Kanabu Nawa

Brane-Induced Skyrmions Baryons in Holographic QCD

We study baryons in holographic QCD with D4/D8/D8 multi D brane system. In holographic QCD, the baryon appears as a topologically non-trivial chiral soliton in a fourdimensional effective theory of mesons, which is called ‘Brane-induced Skyrmion’. We derive and calculate the Euler-Lagrange equation for the hedgehog configuration with chiral profile F (r) and ρ-meson profile G(r), and obtain the soliton solution of the holographic QCD.

Composite and elementary natures of

We develop a practical method to analyze the mixing structure of hadrons consisting of two components of quark-composite and hadronic composite. As an example we investigate the properties of the axial vector meson a1(1260) and discuss its mixing properties quantitatively. We also make reference to the large Nc procedure and its limitation for the classification of such a mixed state.

a_1(1260)

Bose-Einstein condensation of composite diquarks in quark matter (the color superconductor phase) is discussed using the quasichemical equilibrium theory at a relatively low-density region near the deconfinement phase transition, where dynamical quark-pair fluctuations are assumed to be described as bosonic degrees of freedom (diquarks). A general formulation is given for the diquark formation and particle-antiparticle pair-creation processes in the relativistic framework, and some interesting properties are shown, which are characteristic for the relativistic many-body system. Behaviors of transition temperature and phase diagram of the quark-diquark matter are generally presented in model parameter space, and their asymptotic behaviors are also discussed. As an application to the color superconductivity, the transition temperatures and the quark and diquark density profiles are calculated in case with constituent/current quarks, where the diquark is in the bound/resonant state. We obtained T{sub C}{approx}60-80 MeV for constituent quarks and T{sub C}{approx}130 MeV for current quarks at a moderate density ({rho}{sub b}{approx}3{rho}{sub 0}). The method is also developed to include interdiquark interactions into the quasichemical equilibrium theory within a mean-field approximation, and it is found that a possible repulsive diquark-diquark interaction lowers the transition temperature by {approx}50%.

meson

In this talk, we report our present work on the chiral magnetic effect (CME) under a strong magnetic field at low temperature. To this end, we use the instanton vacuum with the finite instanton-number fluctuation Delta, which relates to the nontrivial topological charge Q_t. We compute the vacuum expectation values of the local chiral density , chiral charge density and induced electromagnetic current . We observed that the longitudinal EM current is much larger than the transverse one, |j_perp/j_parallel| ~ Q_t, and the equals to the | |. It also turns out that the CME becomes insensitive to the magnetic field as T increases, since the instanton effect decreases.

Diquark Bose-Einstein condensation

We study baryons and baryonic matter in holographic QCD using a D 4 / D 8 / D 8 ¯ multi-D-brane system in the superstring theory. We obtain the chiral soliton solution for baryons in the four-dimensional meson theory derived from the multi-D-brane system. For the analysis of finite baryon-density matter, we investigate the chiral soliton on S3 in holographic QCD, and find the delocalization of the soliton, i.e., the swelling of baryons in dense matter.

CHIRAL MAGNETIC EFFECT (CME) AT LOW TEMPERATURE FROM INSTANTON VACUUM

We study baryons as Skyrmions in holographic QCD with

Baryons and Baryonic Matter in Holographic QCD from Superstring

\mathrm{D}4/\mathrm{D}8/\overline{\mathrm{D}8}

Skyrmions with holography and hidden local symmetry

multi-D brane system in type IIA superstring theory, and also in the nonlinear sigma model with hidden local symmetry. Comparing these two models, we find that the extra dimension and its nontrivial curvature can largely change the role of (axial) vector mesons for baryons in four-dimensional space-time. In the hidden local symmetry approach, the

Hadron resonances with coexistence of different natures

\ensuremath{\rho}

Possible Λ[sub c]N molecular bound state

-meson field as a massive Yang-Mills field has a singular configuration in Skyrmion, which gives a strong repulsion for the baryon as a stabilizer. When the