17426308
Impact of Z2 monopoles and vortices on the deconfinement transition
Abstract Suppressing Z 2 -monopoles shifts the line of deconfinement transitions in the coupling plane of the SU (2) lattice gauge theory with a mixed Villain form of action but it still continues to behave also like the bulk transition line. Separate deconfinement and bulk phase transitions are found on the same lattice, suggesting the two to be indeed coincident at higher adjoint couplings. Universality is restored when both monopoles and vortices are suppressed.
15925176
A Possible Lack of Phase Transition in SO(3) Lattice Gauge Theory on Lattices with Two Temporal Sites
This paper is being withdrawn as its main results are already included in section 2 of the paper hep-lat/9901006.
119435829
Behavior of charmonium systems after deconfinement
We present a study of charmonia in hot gluonic plasma, for temperatures up to three times the deconfinement transition temperature ${T}_{c}.$ $q\overline{q}$ systems with quark masses close to the charm mass and different spin-parity quantum numbers were studied on very fine isotropic lattices. The analysis of temporal correlators, and spectral functions constructed from them, shows that the $J/\ensuremath{\psi}$ and ${\ensuremath{\eta}}_{c}$ survive up to quite high temperatures, with little observable change up to ${1.5T}_{c},$ and then gradually weaken and disappear by ${3T}_{c}.$ For the scalar and axial vector channels, serious modifications are induced by the hot medium already close to ${T}_{c},$ possibly dissociating the mesons by ${1.1T}_{c}.$
118865781
Meson correlators above deconfinement
We review recent progress in studying spectral functions for mesonic observables at finite temperatures, by analysis of imaginary time correlators directly calculated on isotropic lattices. Special attention is paid to the lattice artefacts present in such calculations.
16483183
MESON CORRELATION FUNCTIONS AT HIGH TEMPERATURES.
We present preliminary results for the correlation- and spectral functions of different meson channels on the lattice. The main focus lies on gaining control over cut-off as well as on the finite-volume effects. Extrapolations of screening masses above the deconfining temperature are guided by the result of the free (T = {infinity}) case on the lattice and in the continuum. We study the quenched non-perturbatively improved Wilson-clover fermion as well as the hypercube fermion action which might show less cut-off effects.
119240200
Properties of the SU(Nc) Gluon Plasma
We investigate the deconfinement transition in SU(Nc) gauge theories, and properties of the deconfined phase. A detailed lattice study of SU(4) and SU(6) gauge theories are conducted, and finite volume and cutoff effects on thermodynamic observables are studied. The scaling of the deconfinement transition point with lattice spacing is used to calculate the scale, Lambda_MSbar. The continuum estimates of the thermodynamic quantities are used to study properties of the gluon plasma. In particular, the approach to conformal limit is studied. We do not find any evidence of a strongly coupled, conformal phase in these theories.
119252560
Higher spin quasinormal modes and one-loop determinants in the BTZ black hole
A bstractWe solve the wave equations of arbitrary integer spin fields in the BTZ black hole background and obtain exact expressions for their quasinormal modes. We show that these quasinormal modes precisely agree with the location of the poles of the corresponding two point function in the dual conformal field theory as predicted by the AdS/CFT correspondence. We then use these quasinormal modes to construct the one-loop determinant of the higher spin field in the thermal BTZ background. This is shown to agree with that obtained from the corresponding heat kernel constructed recently by group theoretic methods.
119521185
Colors of Luminous Bulges in Cluster MS 1054–03 and Field Galaxies at Redshifts z ~ 0.83*
Using Hubble Space Telescope images, we separate the bulgelike (dubbed "pbulge") and disklike ("pdisk") components of 71 galaxies in the rich cluster MS 1054-03 and of 21 in the field. Our key finding is that luminous pbulges are very red, with rest-frame U-B ~ 0.45, while predicted colors are bluer by 0.20 mag. Moreover, these very red colors appear to be independent of environment, pbulge luminosity, pdisk color, and pbulge fraction. These results challenge any model of hierarchical galaxy formation that predicts the colors of distant (z ~ 0.8) luminous field and cluster bulges will differ. Our findings also disagree with other claims that 30% to 50% of bright bulges and elliptical galaxies at z ~ 1 are very blue (U-B ≤ 0).