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Bulk Viscosity Effects in Event-by-Event Relativistic Hydrodynamics

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arxiv 1305.1981 v2 pith:F35HRBCY submitted 2013-05-09 nucl-th hep-phnucl-ex

classification nucl-thhep-phnucl-ex
keywords bulkviscosityhydrodynamicscollectiveeffectseventflowviscous
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Bulk viscosity effects on the collective flow harmonics in heavy ion collisions are investigated, on an event by event basis, using a newly developed 2+1 Lagrangian hydrodynamic code named v-USPhydro which implements the Smoothed Particle Hydrodynamics (SPH) algorithm for viscous hydrodynamics. A new formula for the bulk viscous corrections present in the distribution function at freeze-out is derived starting from the Boltzmann equation for multi-hadron species. Bulk viscosity is shown to enhance the collective flow Fourier coefficients from $v_2(p_T)$ to $v_5(p_T)$ when $% p_{T}\sim 1-3$ GeV even when the bulk viscosity to entropy density ratio, $% \zeta/s$, is significantly smaller than $1/(4\pi)$.

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Forward citations

Cited by 8 Pith papers

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