English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The transport coefficients of quark matter at non-zero chemical potential andtemperature are computed within the two-flavor Nambu--Jona-Lasinio model. Weapply the Kubo formalism to obtain the thermal ($\kappa$) and electrical($\sigma$) conductivities as well as an update of the shear viscosity ($\eta$)by evaluating the corresponding equilibrium two-point correlation functions toleading order in the $1/N_c$ expansion. The Dirac structure of theself-energies and spectral functions is taken into account as these areevaluated from the meson-exchange Fock diagrams for on-mass-shell quarks. Wefind that the thermal and electrical conductivities are decreasing functions oftemperature and density above the Mott temperature $T_{\rm M}$ of dissolutionof mesons into quarks, the main contributions being generated by the temporaland vector components of the spectral functions. The coefficients show auniversal dependence on the ratio $T/T_{\rm M}$ for different densities, i.e.,the results differ by a chemical-potential dependent constant. We also showthat the Wiedemann-Franz law for the ratio $\sigma/\kappa$ does not hold. Theratio $\eta/s $, where $s$ is the entropy density, is of order of unity (orlarger) close to the Mott temperature and, as the temperature increases,approaches the AdS/CFT bound $1/4\pi$. It is also conjectured that the ratio$\kappa T/c_V $, with $c_V$ being the specific heat, is bounded from below by$1/18$.

Transport coefficients of two-flavor quark matter from the Kubo formalism