https://doi.org/10.1140/epjc/s10052-008-0718-z
Regular Article - Theoretical Physics
Glueballs and the superfluid phase of Two-Color QCD
1
INFN, Laboratori Nazionali di Frascati, via E. Fermi 40, 00044, Frascati, Italy
2
INFN, Sezione di Roma, P. le A. Moro 2, 00185, Roma, Italy
3
Dipartimento di Fisica Sapienza, Università di Roma, P. le A. Moro 2, 00185, Roma, Italy
* e-mail: lombardo@lnf.infn.it
Received:
21
May
2008
Revised:
4
July
2008
Published online:
24
September
2008
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 63×12 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, μ c=m π /2, and the propagators change in a significant way in the superfluid phase, while the Polyakov loop is nearly 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 non-zero density induces non-trivial modifications of the gluonic medium.
PACS: 12.38 Gc – / 11.15.Ha – / 12.38.Aw –
© Springer-Verlag , 2008
