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#
Transport and Magnetohydrodynamics
Meeting

Venue: PHYS 02.116 and via Zoom

Time: Monday, June 17, 2024, 11:00 am

Contact: hees@itp.uni-frankfurt.de

## Diffusion coefficient matrix for multiple conserved charges: a Kubo
approach

### Sourav Dey (National Institute of Science Education and Research,
Jatni, India)

The strongly interacting matter created in
relativistic heavy-ion collisions possesses several conserved quantum
numbers, such as baryon number, strangeness, and electric charge. The
diffusion process of these charges can be characterized by a diffusion
matrix that describes the mutual influence of the diffusion of various
charges. We derive the Kubo relations for evaluating diffusion
coefficients as elements of a diffusion matrix. We further demonstrate
that in the weak coupling limit, the diffusion matrix elements obtained
through Kubo relations reduce to those obtained from kinetic theory with
an appropriate identification of the relaxation times. We illustrate this
evaluation in a toy model of two interacting scalar fields with two
conserved charges.

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