13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Thermal fluctuations in relativistic heavy-ion collisions

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Correlations and fluctuations Poster Session

Speaker

Prof. Subrata Pal (Tata Institute of Fundamental Research, Mumbai, India)

Description

Fluctuation-dissipation theorem indicates the presence of hydrodynamic (local thermal) fluctuations in otherwise deterministic theory of viscous hydrodynamics. We have formulated a general theory of thermal fluctuations within causal second-order viscous hydrodynamic evolution of matter formed in relativistic heavy ion collisions. The fluctuation is treated perturbatively on top of boost-invariant longitudinal expansion [(0+1)-dim] as well as for realistic (1+1)-dim expansion. A numerical model simulation was developed for hydrodynamic evolution in (1+1)-dim which was tested to reproduce the analytic results for the Riemann solutions of expansion of matter in vacuum at early times, and the Landau-Khalatnikov wave propagation inside the medium for later times. Numerical simulation of thermal noise is performed for various second-order dissipative evolution equations using lattice QCD equation of state. Phenomenological effects of thermal fluctuations for the two-particle rapidity correlations showed that viscous damping of the correlation is at most ~20%.Further, significant damping was found at small rapidity separations when second-order dissipative hydrodynamics was employed instead of first-order Navier-Stokes theory. As compared to the conformal equation of state, the softer lattice QCD EOS causes reduced propagation of the fluctuations and leads to a pronounced peak in
the rapidity correlations. In contrast to Bjorken flow, enhanced velocity gradients at large rapidities induce quite large fluctuations and thereby larger rapidity correlations.

Centralised submission by Collaboration Presenter name already specified
Content type Theory

Primary authors

Chandrodoy Chattopadhyay (Tata Institute of Fundamental Research) Prof. Rajeev S. Bhalerao (IISER, Pune) Prof. Subrata Pal (Tata Institute of Fundamental Research, Mumbai, India)

Presentation Materials

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