Coupling constant corrections in a holographic model of heavy ion collisions with nonzero baryon number density
Name
Folkestad2019_Article_CouplingConstantCorrectionsInA.pdf
Description
Published version
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2.16 MB
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Author(s)
Folkestad, Aasmund Schiager
Grozdanov, Saso
Rajagopal, Krishna
Date Issued
December 2019
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Folkestad, Asmund et al. “Coupling constant corrections in a holographic model of heavy ion collisions with nonzero baryon number density.” Journal of High Energy Physics 12 (2019): 093 © 2019 The Author(s)
Version
Final published version
Abstract
Sufficiently energetic collisions of heavy ions result in the formation of a droplet of a strongly coupled liquid state of QCD matter known as quark-gluon plasma. By using gauge-gravity duality (holography), a model of a rapidly hydrodynamizing and thermal- izing process like this can be constructed by colliding sheets of energy density moving at the speed of light and tracking the subsequent evolution. In this work, we consider the dual gravitational description of such collisions in the most general bulk theory with a four-derivative gravitational action containing a dynamical metric and a gauge field in five dimensions. Introducing the bulk gauge field enables the analysis of collisions of sheets which carry nonzero “baryon” number density in addition to energy density. Introducing the four-derivative terms enables consideration of such collisions in a gauge theory with finite gauge coupling, working perturbatively in the inverse coupling. While the dynamics of energy and momentum in the presence of perturbative inverse-coupling corrections has been analyzed previously, here we are able to determine the effect of such finite coupling corrections on the dynamics of the density of a conserved global charge, which we take as a model for the dynamics of nonzero baryon number density. In accordance with expec- tations, as the coupling is reduced we observe that after the collisions less baryon density ends up stopped at mid-rapidity and more of it ends up moving near the lightcone.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1007/JHEP12(2019)093
