May 16 – 20, 2022
Europe/Zurich timezone

Extended relaxation time approximation and relativistic dissipative hydrodynamics

May 17, 2022, 7:00 PM
Theory poster Heavy Ions Poster Session I


Mrs Dipika Dash (NISER, Bhubaneswar)


Development of a new framework for the derivation of order-by-order hydrodynamics from the Boltzmann equation is necessary as the widely used Anderson-Witting formalism leads to violation of fundamental conservation laws when the relaxation-time depends on particle energy, or in a hydrodynamic frame other than the Landau frame. We generalize an existing framework for the consistent derivation of relativistic dissipative hydrodynamics from the Boltzmann equation with an energy-dependent relaxation-time by extending the Anderson-Witting relaxation-time approximation. We argue that the present framework is compatible with conservation laws and derives first-order hydrodynamic equations in the landau frame. Further, we show that the transport coefficients, such as shear and bulk viscosity as well as charge and heat diffusion currents, have corrections due to the energy dependence of relaxation-time compared to what one obtains from the Anderson-Witting approximation of the collision term. The ratio of these transport coefficients are studied using a parametrized relaxation time, and several interesting scaling features are reported.

Primary author

Mrs Dipika Dash (NISER, Bhubaneswar)


Mr Samapan Bhadury (NISER, Bhubaneswar) Mr Sunil Jaiswal (TIFR, Mumbai) Dr Amaresh Jaiswal (NISER, Bhubaneswar)

Presentation materials