542 research outputs found
Finite-temperature study of eight-flavor SU(3) gauge theory
We present new lattice investigations of finite-temperature transitions for
SU(3) gauge theory with Nf=8 light flavors. Using nHYP-smeared staggered
fermions we are able to explore renormalized couplings on
lattice volumes as large as . Finite-temperature transitions at
non-zero fermion mass do not persist in the chiral limit, instead running into
a strongly coupled lattice phase as the mass decreases. That is,
finite-temperature studies with this lattice action require even larger to directly confirm spontaneous chiral symmetry breaking.Comment: Contribution to the Sakata Memorial KMI Workshop on "Origin of Mass
and Strong Coupling Gauge Theories" (SCGT15), 3--6 March 2015, Nagoya
Universit
Light scalar spectrum in extra-dimensional gauge theories
The phase diagram of five-dimensional SU(2) gauge theories with one
compactified dimension on anisotropic lattices has a rich structure. In this
contribution we show how to control non-perturbatively the scale hierarchy
between the cut-off and the compactification scale in the bare parameter space.
There exists a set of strong bare couplings where the the five-dimensional
lattice theory can be described by an effective four-dimensional theory with a
scalar field in the adjoint representation. We present a detailed study of the
light scalar spectrum as it arises from the non-perturbative dynamics of the
full five-dimensional lattice theory. We also investigate the mixing with
scalar glueball states in the attempt to further establish the
extra-dimensional nature of light scalar states.Comment: 7 pages, 4 figures. To appear in the proceedings of the 30th
International Symposium on Lattice Field Theory, June 24-29 201
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