Causality violations in realistic simulations of heavy-ion collisions

Plumberg, Christopher; Almaalol, Dekrayat; Dore, Travis; Noronha, Jorge; Noronha-Hostler, Jacquelyn

doi:10.1103/physrevc.105.l061901

Cited by 32 publications

(27 citation statements)

References 106 publications

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“…This poses a problem for MIS at early times in a heavy-ion collision, when the regulator transient modes are still present, because observables sensitive to the early times may reflect the physics of these regulators. In addition, the causality violation [531] and stability [532] in these setups has to be monitored when modeling, for example, heavy-ion collisions.…”

Section: Statusmentioning

confidence: 99%

Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

Sorensen¹,

Agarwal²,

Brown³

et al. 2023

Preprint

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Section: Statusmentioning

confidence: 99%

Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

Sorensen¹,

Agarwal²,

Brown³

et al. 2023

Preprint

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“…Israel and Stewart (IS) put forward an approach [35] where linearized disturbances around global equilibrium can be causal and stable [36], if certain conditions for the fluid's equation of state and transport coefficients (e.g., bulk and shear viscosities) are fulfilled. However, despite recent progress [37,38], very little is known about the properties and the constraints that must be fulfilled in these theories in the nonlinear regime, which can be important in simulations already in flat spacetime [39] and, also, when embedding such fluid models in dynamical spacetimes. In fact, in the context of viscous dark fluid modeling, it is not known how the recently found nonlinear constraints [37,38] coming from causality affect previous conclusions drawn from such Israel-Stewart-like models (e.g., [10,26,27]).…”

Section: Introductionmentioning

confidence: 99%

First-Order General-Relativistic Viscous Fluid Dynamics

2022

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We investigate the out-of-equilibrium dynamics of viscous fluids in a spatially flat Friedmann-Lemaître-Robertson-Walker cosmology using the most general causal and stable viscous energymomentum tensor defined at first order in spacetime derivatives. In this new framework a pressureless viscous fluid having equilibrium energy density ρ can evolve to an asymptotic future solution in which the Hubble parameter approaches a constant while ρ → 0, even in the absence of a cosmological constant (i.e., Λ = 0). Thus, while viscous effects in this model drive an accelerated expansion of the universe, the equilibrium energy density itself vanishes, leaving behind only the acceleration. This behavior emerges as a consequence of causality in first-order theories of relativistic fluid dynamics and it is fully consistent with Einstein's equations.

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“…In principle, initial conditions consist of a complete specification of the full initial energy-momentum tensor and initial conserved charge currents for baryon number B, strangeness S, and electric charge Q. In practice, only the initial energy density is used and all other components are set to zero, though there has been recent progress on including more initial state variables [1][2][3][4][5][6][7][8]. Some thought has been given to conserved charge currents, primarily finite net baryon density [9][10][11][12][13], which is motivated by the search for a critical point in the Quantum Chromodynamics (QCD) phase diagram in this regime [11,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Initializing BSQ with Open-Source ICCING

Carzon

Martínez

Sievert

et al. 2022

Supl. Rev. Mex. Fis.

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While it is well known that there is a significant amount of conserved charges in the initial state of nuclear collisions, the production of these due to gluon splitting has yet to be thoroughly investigated. The ICCING (Initial Conserved Charges in Nuclear Geometry) algorithm reconstructs these quark distributions, providing conserved strange, baryon, and electric charges, by sampling a given model for the g → qq¯ splitting function over the initial energy density, which is valid at top collider energies, even when µB = 0. The ICCING algorithm includes fluctuations in the gluon longitudinal momenta, a structure that supports the implementation of dynamical processes, and the c++ version is now open-source. A full analysis of parameter choices on the model has been done to quantify the effect these have on the underlying physics. We find there is a sustained difference across the different charges that indicates sensitivity to hot spot geometry.

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Causality violations in realistic simulations of heavy-ion collisions

Cited by 32 publications

References 106 publications

Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

First-Order General-Relativistic Viscous Fluid Dynamics

Initializing BSQ with Open-Source ICCING

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