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Observation of deconfinement in a cold dense quark medium | | V. G. Bornyakov
; V. V. Braguta
; E.-M. Ilgenfritz
; A. Yu. Kotov
; A. V. Molochkov
; A. A. Nikolaev
; | | Date: |
6 Nov 2017 | | Abstract: | In this paper we study the confinement/deconfinement transition in lattice
$SU(2)$ QCD at finite quark density and zero temperature. The simulations are
performed on an $32^4$ lattice with rooted staggered fermions at a lattice
spacing $a = 0.044 mathrm{~fm}$. This small lattice spacing allowed us to
reach very large baryon density (up to quark chemical potential $mu_q > 2000
mathrm{~MeV}$) avoiding strong lattice artifacts. In the region $mu_qsim
1000 mathrm{~MeV}$ we observe for the first time the confinement/deconfinement
transition which manifests itself in rising of the Polyakov loop and vanishing
of the string tension $sigma$. After the deconfinement is achieved at $mu_q >
1000 mathrm{~MeV}$, we observe a monotonous decrease of the spatial string
tension $sigma_s$ which ends up with $sigma_s$ vanishing at $mu_q > 2000
mathrm{~MeV}$. From this observation we draw the conclusion that the
confinement/deconfinement transition at finite density and zero temperature is
quite different from that at finite temperature and zero density. Our results
indicate that in very dense matter the quark-gluon plasma is in essence a
weakly interacting gas of quarks and gluons without a magnetic screening mass
in the system, sharply different from a quark-gluon plasma at large
temperature. | | Source: | arXiv, 1711.1869 | | Services: | Forum | Review | PDF | Favorites | |
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