Abstract
We show that the ideal fluid local equilibrium limit, defined as the existence of a flow frame \(u_\mu \) which characterises the direction of both a conserved entropy current and conserved charge currents is incompatible with non-Abelian gauge theory if local color charge density is non-zero. Instead, the equation of state becomes dependent on \(u_\mu \) via modes which are roughly equivalent to ghost modes in the hydrodynamic limit. These modes can be physically imagined as a field of “purcell swimmers” whose “arms and legs” are outstretched in Gauge space. Also, vorticity should couple to the Wilson loop via the chromo-electro-magnetic field tensor, which in local equilibrium is not a “force” but instead represents the polarization tensor of the gluons. We show that because of this coupling vorticity also acquires swirling non-hydrodynamic modes. We then argue that these swirling and swimming non-hydrodynamic modes are the manifestation of gauge redundancy within local equilibrium, and speculate on their role in quark-gluon plasma thermalization.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This is a theory paper, with analytical calculations. There is no data associated with it beyond the equations in the paper.]
Notes
A globally equilibrated color-neutral state in the Grand Canonical ensemble is of course well-defined and understood using lattice techniques. The relation between such a system and the locally equilibrated ideal fluid examined here is the same as the relation between a hydrostatic bath in global equilibrium, and the same bath with sound-waves bouncing around it. Even without Gauge theories the relationship between the two setups can be extraordinarily subtle, something the last section will discuss further.
Equation 29, with both \(T_{\mu \nu },n_\mu \) and \(J_{\mu }\) becoming gauge dependent but the whole exponent gauge-invariant.
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Acknowledgements
GT acknowledges support from FAPESP proc. 2017/06508-7, partecipation in FAPESP tematico 2017/05685-2 and CNPQ bolsa de produtividade 301996/2014-8. DM was supported by CNPQ graduate fellowship n. 147435/2014-5. This work is a part of the project INCT-FNA Proc. No. 464898/2014-5. We wish to thank David Montenegro, Radoslaw Ryblewski, Saso Grozdanov, Luca Fabbri and Henrique Sa Earp for fruitful discussions.
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Torrieri, G. The ideal hydrodynamic limit and non-Abelian gauge symmetries. Eur. Phys. J. A 56, 121 (2020). https://doi.org/10.1140/epja/s10050-020-00121-z
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DOI: https://doi.org/10.1140/epja/s10050-020-00121-z