7 research outputs found
QCD thermodynamics with continuum extrapolated Wilson fermions II
We continue our investigation of 2+1 flavor QCD thermodynamics using
dynamical Wilson fermions in the fixed scale approach. Two additional pion
masses, approximately 440 MeV and 285 MeV, are added to our previous work at
545 MeV. The simulations were performed at 3 or 4 lattice spacings at each pion
mass. The renormalized chiral condensate, strange quark number susceptibility
and Polyakov loop is obtained as a function of the temperature and we observe a
decrease in the light chiral pseudo-critical temperature as the pion mass is
lowered while the pseudo-critical temperature associated with the strange quark
number susceptibility or the Polyakov loop is only mildly sensitive to the pion
mass. These findings are in agreement with previous continuum results obtained
in the staggered formulation.Comment: 19 pages, 13 figures, published versio
Charmonium spectral functions from 2+1 flavour lattice QCD
Finite temperature charmonium spectral functions in the pseudoscalar and
vector channels are studied in lattice QCD with 2+1 flavours of dynamical
Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057 fm),
with a non-physical pion mass of 545 MeV. The highest
temperature studied is approximately . Up to this temperature no
significant variation of the spectral function is seen in the pseudoscalar
channel. The vector channel shows some temperature dependence, which seems to
be consistent with a temperature dependent low frequency peak related to heavy
quark transport, plus a temperature independent term at \omega>0. These results
are in accord with previous calculations using the quenched approximation.Comment: 17 pages, 9 figures, 2 table
QCD thermodynamics with Wilson fermions
QCD is investigated at finite temperature using Wilson fermions in the fixed
scale approach. A 2+1 flavor stout and clover improved action is used at four
lattice spacings allowing for control over discretization errors. The light
quark masses in this first study are fixed to heavier than physical values. The
renormalized chiral condensate, quark number susceptibility and the Polyakov
loop is measured and the results are compared with the staggered formulation in
the fixed N_t approach. The Wilson results at the finest lattice spacing agree
with the staggered results at the highest N_t.Comment: 7 pages, Talk presented at the XXIX International Symposium on
Lattice Field Theory (Lattice 2011), July 10-16, 2011, Squaw Valley, Lake
Tahoe, California, US
DAAM is required for thin filament formation and Sarcomerogenesis during muscle development in Drosophila.
During muscle development, myosin and actin containing filaments assemble into the highly organized sarcomeric structure critical for muscle function. Although sarcomerogenesis clearly involves the de novo formation of actin filaments, this process remained poorly understood. Here we show that mouse and Drosophila members of the DAAM formin family are sarcomere-associated actin assembly factors enriched at the Z-disc and M-band. Analysis of dDAAM mutants revealed a pivotal role in myofibrillogenesis of larval somatic muscles, indirect flight muscles and the heart. We found that loss of dDAAM function results in multiple defects in sarcomere development including thin and thick filament disorganization, Z-disc and M-band formation, and a near complete absence of the myofibrillar lattice. Collectively, our data suggest that dDAAM is required for the initial assembly of thin filaments, and subsequently it promotes filament elongation by assembling short actin polymers that anneal to the pointed end of the growing filaments, and by antagonizing the capping protein Tropomodulin