Crossover Curve Research Articles

QCD thermodynamics with Wilson quarks

We present results from a study of hadron thermodynamics with Wilson quarks. The crossover curve between the high and low temperature phases is determined as a function of the gauge coupling and hopping parameter on 8 3 × 4 lattices. Meson masses are calculated along the crossover curve, and screening lengths are determined in the vicinity of it on 8 3 × 16 and 8 2 × 16 × 4 lattices, respectively.

Hadron thermodynamics with Wilson quarks.

We study hadron thermodynamics with Wilson quarks. The crossover curve between the high-and low-temperature phases is determined as a function of gauge coupling and hopping parameter on ${8}^{3}$\ifmmode\times\else\texttimes\fi{}4 lattices. Screening lengths are calculated in the vicinity of the crossover region, and meson masses are calculated along the crossover curve on ${8}^{2}$\ifmmode\times\else\texttimes\fi{}16\ifmmode\times\else\texttimes\fi{}4 and ${8}^{3}$\ifmmode\times\else\texttimes\fi{}16 lattices, respectively.

Demonstration of reduced source size broadening with a Johann focusing elliptical spectrograph and theory of the second-order source broadening

A Johann focusing elliptical spectrograph has been developed for the measurement of high-resolution x-ray spectra from a spatially extended source. The instrument was designed for the study of high-density, high-temperature plasmas produced by z-pinch implosion or ion-beam bombardment on pulsed-power accelerators. We have constructed and tested this instrument, and have demonstrated an improvement in resolution over what we obtain with a standard circular detector when viewing an extended source. Analytic results for the second-order source broadening due to a finite source size have been obtained and verified by ray tracing. Also given is a simple parametric equation for the Johann crossover curve in terms of either the ellipse sweep angle λ or the Bragg angle θB.

Crossover from dissipative to conservative behaviour in period-doubling systems

We investigate the crossover properties, between the conservative and dissipative limit, for period-doubling bifurcations in two-dimentional iterative maps; as a generic example we use the standard form of the Hénon map. The approximants to the Feigenbaum constant δ lie on a universal crossover curve, which turns out to be non-monotonic. A similar curve is found for the scaling factor α. More generally, we discuss the crossover of the trajectory scaling function 1/ σ, and its properties in the conservative limit.