1,438 research outputs found
Hybrid star structure with the Field Correlator Method
We explore the relevance of the color-flavor locking phase in the equation of
state (EoS) built with the Field Correlator Method (FCM) for the description of
the quark matter core of hybrid stars. For the hadronic phase, we use the
microscopic Brueckner-Hartree-Fock (BHF) many-body theory, and its relativistic
counterpart, i.e. the Dirac-Brueckner (DBHF). We find that the main features of
the phase transition are directly related to the values of the quark-antiquark
potential , the gluon condensate and the color-flavor
superconducting gap . We confirm that the mapping between the FCM and
the CSS (constant speed of sound) parameterization holds true even in the case
of paired quark matter. The inclusion of hyperons in the hadronic phase and its
effect on the mass-radius relation of hybrid stars is also investigated.Comment: 15 pages, 8 figures ; revised version to be published in the EPJA
Topical Issue on "Exotic Matter in Neutron Stars
Ghost propagator and the Coulomb form factor from the lattice
We calculate the Coulomb ghost propagator G(|p|) and the static Coulomb
potential V_C(|r|) for SU(2) Yang-Mills theory on the lattice. In view of
possible scaling violations related to deviations from the Hamiltonian limit we
use anisotropic lattices to improve the temporal resolution. We find that the
ghost propagator is infrared enhanced with an exponent kappa_gh ~ 0.5 while the
Coulomb potential exhibits a string tension larger than the Wilson string
tension, sigma_C ~ 2 sigma. This agrees with the Coulomb "scaling" scenario
derived from the Gribov-Zwanziger confinement mechanism.Comment: 23 pages, 5 figures. Some issues clarified and extended, references
added. To appear in PR
SO(3) Yang-Mills theory on the lattice
We numerically investigate the phase structure of pure SO(3) LGT at zero and
non-zero temperature in the presence of a Z2 blind monopole chemical potential.
The physical meaning of the different phases, a possible symmetry breaking
mechanism as well as the existence of an order parameter for the finite
temperature phase transition are discussed.Comment: 3 pages, 2 figures LaTeX file. Uses espcrc2 style and amssymb
package. Talk given at Lattice2002(nonzerot), Boston. Corrected version with
one added referenc
Beta-function, Renormalons and the Mass Term from Perturbative Wilson Loops
Several Wilson loops on several lattice sizes are computed in Perturbation
Theory via a stochastic method. Applications include: Renormalons, the Mass
Term in Heavy Quark Effective Theory and (possibly) the beta-function.Comment: 3 pages, 1 eps figure. Contributed to 17th International Symposium on
Lattice Field Theory (LATTICE 99), Pisa, Italy, 29 Jun - 3 Jul 199
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