96 research outputs found
External Field Dependence of Deconfinement Temperature in SU(3)
We study vacuum dynamics of SU(3) lattice gauge theory at finite temperature.
Using the lattice Schr\"odinger functional, SU(3) vacuum is probed by means of
an external constant Abelian chromomagnetic field. Our preliminary numerical
data suggest that, by increasing the strength of the applied external field,
deconfinement temperature decreases towards zero. This means that strong enough
Abelian chromomagnetic fields destroy confinement of color.Comment: Lattice2001(confinement); 3 pages, 4 figure
N = 1 QCD in External Magnetic Fields: Staggered Fermions
We investigate N = 1 QCD in external magnetic fields on the lattice. The
background field is introduced by means of the so-called Schrodinger
functional. We adopt standard staggered fermions with constant bare mass and magnetic fields with constant magnetic flux up to . We find that the the deconfinement and chiral symmetry restoration
temperatures do not depend on the strength of the applied magnetic field. Our
method allow us to easily study the effects of the external magnetic fields on
the QCD thermodynamics. We determine the influences of applied magnetic fields
to the free energy, pressure, and equation of state of strongly interacting
matter.Comment: 21 pages, 11 figures; revised version accepted for publication in
JHE
Study of Confinement Using the Schroedinger Functional
We use a gauge-invariant effective action defined in terms of the lattice
Schroedinger functional to investigate vacuum dynamics and confinement in pure
lattice gauge theories. After a brief introduction to the method, we report
some numerical results.Comment: Contributed to workshop GISELDA, Frascati, Italy, 14-18 Jan 200
The Higgs boson: from the lattice to LHC
We discuss the triviality and spontaneous symmetry breaking scenario where
the Higgs boson without self-interaction coexists with spontaneous symmetry
breaking. We argue that non perturbative lattice investigations support this
scenario. Moreover, from lattice simulations we predict that the Higgs boson is
rather heavy. We estimate the Higgs boson mass and the Higgs total width
.Comment: 15 pages, 3 figures, revised version accepted for publication on ISRN
High Energy Physic
SU(2) vacuum dynamics in applied external magnetic field
The vacuum dynamics of SU(2) lattice gauge theory is studied by means of a
gauge-invariant effective action, both at zero and finite temperature. Working
with lattices up to 32^4 we check the scaling of the energy density with the
magnetic length. We find that the screening at zero temperature of the applied
external magnetic field weakens by increasing the temperature.Comment: LATTICE98(confine
Deconfinement phase transitions in external fields
We compare vacuum dynamics of abelian versus non abelian lattice gauge
theories in presence of external fields. We find that the deconfinement
temperature of non abelian theories depends on the strength of a constant
abelian chromomagnetic field end eventually goes to zero. On the contrary such
an effect is not shared by abelian theories. We argue on the relevance of this
result to understand the QCD vacuum.Comment: Poster presented at Lattice2005 (Topology and Confinement), Dublin,
July 25-30, 2005; 6 pages, 3 figures, uses PoS.cls; to appear in Proceedings
of Scienc
Full QCD in external chromomagnetic field
We investigate the deconfining phase transition in full QCD with two flavors
of staggered fermions in presence of a constant abelian chromomagnetic field.
We find that the deconfinement temperature decreases and eventually goes to
zero by increasing the strength of the chromomagnetic field. Moreover our
results suggest that the chiral transition coincides with the deconfinement
transition and therefore even the chiral critical temperature depends on the
applied chromomagnetic field. We also find that the chiral condensate increases
with the strength of the chromomagnetic field.Comment: 7 pages, 5 figures, Lattice 2006 (Topology and Confinement
Perturbing QCD with external fields
We present some up-to-date results on QCD phase transition in a
chromomagnetic constant background field and in an abelian monopole background
field. Our results indicate that the QCD critical temperature is not modified
by a monopole background field, whilst it is modified by a constant
chromomagnetic field. We improve our earlier estimate of the QCD critical
parameters in a chromomagnetic background field by performing lattice
simulations with weaker fields.Comment: contribution to the XXV International Symposium on Lattice Field
Theory, July 30 - August 4 2007, Regensburg, Germany, 7 page
Critical line of 2+1 flavor QCD: Toward the continuum limit
We determine the continuum limit of the curvature of the pseudocritical line
of QCD with =2+1 staggered fermions at nonzero temperature and quark
density. We perform Monte Carlo simulations at imaginary baryon chemical
potentials, adopting the HISQ/tree action discretization, as implemented in the
code by the MILC collaboration. Couplings are adjusted so as to move on a line
of constant physics, as determined in Ref.~\cite{Bazavov:2011nk}, with the
strange quark mass fixed at its physical value and a light-to-strange
mass ratio . The chemical potential is set at the same value for
the three quark species, . We attempt an extrapolation
to the continuum using the results on lattices with temporal size up to
. Our estimate for the continuum value of the curvature at
zero baryon density, , is compared with recent lattice results
and with experimental determinations of the freeze-out curve.Comment: 10 pages, 4 figures, 16 tables; modified title and abstract, added
two tables and a few comments in the text, added appendix with 13 tables;
version to appear on Phys. Rev.
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