Aug 12 – 18, 2012
US/Eastern timezone

If you have any questions about the details of the program please contact Bolek Wyslouch

Fluctuating Hydrodynamics Confronts the Rapidity Dependence of Transverse Momentum Fluctuations

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Global and collective dynamics Poster Session Reception


Sean Gavin (Wayne State University)


Interest in the development of the theory of fluctuating hydrodynamics is growing [1]. Early efforts suggested that viscous diffusion broadens the rapidity dependence of transverse momentum correlations [2]. That work stimulated an experimental analysis by STAR [3]. We attack this new data along two fronts. First, we compute STAR’s fluctuation observable using the NeXSPheRIO code, which combines fluctuating initial conditions from a string fragmentation model with deterministic viscosity-free hydrodynamic evolution [4]. We find that NeXSPheRIO produces a longitudinal narrowing, in contrast to the data. Second, we study the hydrodynamic evolution using second order causal viscous hydrodynamics including Langevin noise. We obtain a deterministic evolution equation for the transverse momentum density correlation function. We use the latest theoretical equations of state and transport coefficients to compute STAR’s observable. The results are in excellent accord with the measured broadening. In addition, we predict features of the distribution that can distinguish 2nd and 1st order diffusion. J. Kapusta, B. Mueller, M. Stephanov, arXiv:1112.6405 [nucl-th]. S. Gavin and M. Abdel-Aziz, Phys. Rev. Lett. 97, 162302 (2006), arXiv:nucl-th/0606061. H. Agakishiev et al., STAR, Phys. Lett. B704, 467 (2011), arXiv:1106.4334 [nucl-th]. M. Sharma, C. Pruneau, S. Gavin, J. Takahashi, R. Derradi de Souza, T. Kodama, Phys. Rev. C84, 054915, (2011), arXiv:1107.3587 [nucl-th].

Primary author

Sean Gavin (Wayne State University)


George Moschelli (Frankfurt Institute for Advanced Studies) Rajendra Pokharel (Wayne State University)

Presentation materials