461 research outputs found
The beta function and equation of state for QCD with two flavors of quarks
We measure the pressure and energy density of two flavor QCD in a wide range
of quark masses and temperatures. The pressure is obtained from an integral
over the average plaquette or psi-bar-psi. We measure the QCD beta function,
including the anomalous dimension of the quark mass, in new Monte Carlo
simulations and from results in the literature. We use it to find the
interaction measure, E-3p, yielding non-perturbative values for both the energy
density E and the pressure p. uuencoded compressed PostScript file Revised
version should work on more PostScript printers.Comment: 24 page
The equation of state for two flavor QCD
We improve the calculation of the equation of state for two flavor QCD by
simulating on lattices at appropriate values of the couplings for the
deconfinement/chiral symmetry restoration crossover. For the
energy density rises rapidly to approximately 1 just after the
crossover( at this point). Comparing with our previous
result for ~\cite{eos}, we find large finite corrections as
expected from free field theory on finite lattices. We also provide formulae
for extracting the speed of sound from the measured quantities.Comment: Contribution to Lattice 95 proceedings (combines talks presented by
T. Blum and L. Karkkainen). LaTeX, 8 pages, uses espcrc2.sty, postscript
figures include
The equation of state with nonzero chemical potential for 2+1 flavors
We present results for the QCD equation of state with nonzero chemical
potential using the Taylor expansion method with terms up to sixth order in the
expansion. Our calculations are performed on asqtad 2+1 quark flavor lattices
at .Comment: Talk given at the XXV International Symposium on Lattice Field
Theory, July 30-4 August 2007, Regensburg, German
QCD thermodynamics with nonzero chemical potential at and effects from heavy quarks
We extend our work on QCD thermodynamics with 2+1 quark flavors at nonzero
chemical potential to finer lattices with . We study the equation of
state and other thermodynamic quantities, such as quark number densities and
susceptibilities, and compare them with our previous results at . We
also calculate the effects of the addition of the charm and bottom quarks on
the equation of state at zero and nonzero chemical potential. These effects are
important for cosmological studies of the early Universe.Comment: 27 pages, 17 figures. Some small text and figure change
- …