A first estimate of η/s in Au+Au reactions at Elab = 1.23 AGeV
Reichert, T., Inghirami, G., & Bleicher, M. (2021). A first estimate of η/s in Au+Au reactions at Elab = 1.23 AGeV. Physics Letters B, 817, Article 136285. https://doi.org/10.1016/j.physletb.2021.136285
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Physics Letters BDate
2021Copyright
© 2021 The Author(s). Published by Elsevier B.V.
The HADES experiment at GSI has recently provided data on the flow coefficients v1,...,v4 for protons in Au+Au reactions at Elab=1.23AGeV (or sNN=2.4GeV). This data allows to estimate the shear viscosity over entropy density ratio, η/s at low energies via a coarse graining analysis of the UrQMD transport simulations of the flow harmonics in comparison to the experimental data. By this we can provide for the first time an estimate of η/s≈0.65±0.15 (or (8±2)(4π)−1) at such low energies.
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https://converis.jyu.fi/converis/portal/detail/Publication/67413451
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Academy Project, AoFAdditional information about funding
The authors thank Behruz Kardan from the HADES collaboration for stimulating discussion at the “HIPSTARS - Workshop on Heavy Ion Physics and Compact Stars” workshop held online in December 2020. This work was supported by Helmholtz Forschungsakademie Hessen (HFHF), and in the framework of COST Action CA15213 THOR. G. Inghirami is supported by the Academy of Finland, Project no. 297058. Computatio ...
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