The spatial string tension, thermal phase transition, and AdS/QCD

Andreev, Oleg; Захаров, В. И.

doi:10.1016/j.physletb.2007.01.002

Cited by 132 publications

(219 citation statements)

References 16 publications

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“…However the aforesaid works in anisotropic medium are limited to the medium-modification of the perturbative part only and the nonperturbative string term was assumed to zero. However, the string-tension is non vanishing even at temperatures much beyond the deconfinement point [53,54,55], so one should study its effect on the heavy quark potential in anisotropic medium too.…”

Section: Potential In the Anisotropic Mediummentioning

confidence: 99%

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Dissociation of quarkonium in a complex potential

2014

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We have studied the quasi-free dissociation of quarkonia through a complex potential which is obtained by correcting both the perturbative and nonperturbative terms of the QQ potential at T=0 through the dielectric function in real-time formalism. The presence of confining nonperturbative term even above the transition temperature makes the real-part of the potential more stronger and thus makes the quarkonia more bound and also enhances the (magnitude) imaginary-part which, in turn contributes more to the thermal width, compared to the medium-contribution of the perturbative term alone. These cumulative observations result the quarkonia to dissociate at higher temperatures. Finally we extend our calculation to a medium, exhibiting local momentum anisotropy, by calculating the leading anisotropic corrections to the propagators in Keldysh representation. The presence of anisotropy makes the real-part of the potential stronger but the imaginary-part is weakened slightly. However, since the medium corrections to the imaginary-part is a small perturbation to the vacuum part, overall the anisotropy makes the dissociation temperatures higher, compared to isotropic medium.

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Section: Potential In the Anisotropic Mediummentioning

confidence: 99%

“…In the sequel, the phase transition in QCD for physical quark masses is found to be a crossover [51,52]. It is thus reasonable to assume that the string-tension does not vanish abruptly at the deconfinement point [53,54,55], so one should study its effects on heavy quark potential even above T c .…”

Section: Introductionmentioning

confidence: 99%

Dissociation of quarkonium in a complex potential

2014

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“…Instead of adding a nontrivial dilaton, one keeps the dilaton constant while deforming the metric away from AdS 5 . This version of the soft wall model has been studied in [59]. The deformed metric is…”

Section: Gauge/gravity Correspondencementioning

confidence: 99%

Viscous Properties of Strongly Interacting Matter at High Temperature

Kapusta

2010

Relativistic Heavy Ion Physics

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Substantial collective flow is observed in collisions between large nuclei at high energy, and the data are well-reproduced by perfect fluid dynamics. In a separate development, calculation of the dimensionless ratio of shear viscosity η to entropy density within AdS/CFT yields η/s = 1/4π, which has been conjectured to be a lower bound for any physical system. It is shown that the transition from hadrons to quarks and gluons has behavior similar to helium, nitrogen, and water at and near their phase transitions in the ratio η/s. Conversely, there are indications that the ratio of bulk viscosity ζ to entropy density may have a maximum in the vicinity of the phase transition. Therefore it is possible that experimental measurements can pinpoint the location of the transition or rapid crossover in QCD via the ratios η/s and ζ/s in addition to and independently of the equation of state.

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“…In this paper we continue a series of studies [2,3,4] devoted to the heavy quark potentials and pseudo-potentials within a five-dimensional framework nowadays known as AdS/QCD. In [2], the model was presented for computing the quark-antiquark potential.…”

Section: Introductionmentioning

confidence: 99%