Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-04-30
Eur.Phys.J.C58:69-81,2008
Physics
High Energy Physics
High Energy Physics - Lattice
26 pages, 13 figures; discussions and one figure added; to appear in EPJC
Scientific paper
10.1140/epjc/s10052-008-0718-z
We present the first results on scalar glueballs in cold, dense matter using lattice simulations of two color QCD. The simulations are carried out on a $6^3 \times 12$ lattice and use a standard hybrid molecular dynamics algorithm for staggered fermions for two values of quark mass. The glueball correlators are evaluated via a multi-step smearing procedure. The amplitude of the glueball correlator peaks in correspondence with the zero temperature chiral transition, $\mu_c = m_\pi/2$, and the propagators change in a significant way in the superfluid phase, while the Polyakov loop is mearly insensitive to the transition. Standard analysis suggest that lowest mass in the $0^{++}$ gluonic channel decreases in the superfluid phase, but these observations need to be confirmed on larger and more elongated lattices These results indicate that a nonzero density induces nontrivial modifications of the gluonic medium.
Lombardo Maria Paola
Paciello Maria Luigia
Petrarca Silvano
Taglienti Bruno
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