Understanding the out-of-equilibrium dynamics near a critical point in the QCD phase diagram

Rajagopal, Krishna; Ridgway, Gregory W.; Weller, Ryan; Yin, Yi

doi:10.1103/physrevd.102.094025

Cited by 61 publications

(96 citation statements)

References 61 publications

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“…Feedback from the slow mode on c 2 s Following the discussion in section 2, we simply find that in the present case, equation (2.10) takes the following form [34] ∆c 2 s (ω) ≈…”

Section: What Is the Lowest Mode?mentioning

confidence: 58%

“…where ξ 0 is the value equilibrium correlation length far from the critical point and K(x) = In order to parameterize ξ, we follow [34] and write…”

Section: Hydro+ Near the Critical Point In The Qcd Phase Diagrammentioning

confidence: 99%

“…In the previous 15 years, most of the heavy-ion-collision experiments have been set for high collision energies at RHIC and LHC [3,34]. In these experiments, the non-vanishing net baryon charge coming from the incident nuclei mostly ends up at high rapidity.…”

Section: Introductionmentioning

confidence: 99%

“…In the second part of this work, we apply our single-mode Hydro+ results to QCD plasma near the critical point in the QCD phase diagram. We use a set of standard assumptions from the literature (see [34] and references therein), and extract the characteristic momentum q c near the critical point within the kinetic framework [8]. Let us emphasize that our goal is not to provide phenomenological values in this work.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic momentum of Hydro+ and a bound on the speed of sound near the QCD critical point

Abbasi,

Kaminski

2021

Preprint

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Near the critical point in the QCD phase diagram, hydrodynamics breaks down at a momentum where the frequency of the fastest hydrodynamic mode becomes comparable with the decay rate of the slowest non-hydrodynamic mode. Hydro+ was developed as a framework which extends the range of validity of hydrodynamics beyond that momentum value. This was achieved through coupling the hydrodynamic modes to the slowest non-hydrodynamic mode. In this work, analyzing the spectrum of linear perturbations in Hydro+, we find that a slow mode falls out of equilibrium if its momentum is greater than a characteristic momentum value. That characteristic momentum turns out to be set by the branch points of the dispersion relations. These branch points occur at the critical momenta of so-called spectral curves and are related to the radius of convergence of the derivative expansion. The existence of such a characteristic momentum scale suggests that a particular class of slow modes has no remarkable effect on the flow of the plasma. Based on these results and previously derived relations to the stiffness of the equation of state, we find a temperature-dependent upper bound for the speed of sound near the critical point in the QCD phase diagram.

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“…Feedback from the slow mode on c 2 s Following the discussion in section 2, we simply find that in the present case, equation (2.10) takes the following form [34] ∆c 2 s (ω) ≈…”

Section: What Is the Lowest Mode?mentioning

confidence: 58%

“…where ξ 0 is the value equilibrium correlation length far from the critical point and K(x) = In order to parameterize ξ, we follow [34] and write…”

Section: Hydro+ Near the Critical Point In The Qcd Phase Diagrammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristic momentum of Hydro+ and a bound on the speed of sound near the QCD critical point

Abbasi,

Kaminski

2021

Preprint

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“…Searching for experimental signals of critical point and first-order phase transition requires the theoretical frameworks to be calibrated by particle production and flow measurements to provide reliable baseline expectations without critical phenomena [51][52][53][54]. Further studying the effects of out-of-equilibrium evolution of critical fluctuations [55][56][57][58][59] on net proton high-order cumulants and light nuclei productions [60] as functions of collision energy and rapidity intervals would shed light on the QCD phase structure at large baryon density.…”

Section: Outlook and Challengesmentioning

confidence: 99%

Dynamic modeling for heavy-ion collisions

Shen

2022

EPJ Web Conf.

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Recent theory progress in (3+1)D dynamical descriptions of relativistic nuclear collisions at finite baryon density are reviewed. Heavy-ion collisions at different collision energies produce strongly coupled nuclear matter to probe the phase structure of Quantum Chromodynamics (QCD). Dynamical frameworks serve as a quantitative tool to study properties of hot QCD matter and map collisions to the QCD phase diagram. Outstanding challenges are highlighted when confronting theoretical models with the current and forthcoming experimental measurements from the RHIC beam energy scan program.

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