Holographic approach to transport in dense QCD matter

Carlos Hoyos (Department of Physics, Universidad de Oviedo and Instituto de Ciencias y Tecnologías Espaciales de Asturias (ICTEA), C/ Federico García Lorca 18, ES-33007 Oviedo, Spain) ; Niko Jokela (Department of Physics and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 University of Helsinki, Finland) ; Matti Järvinen (Asia Pacific Center for Theoretical Physics, Pohang 37673, Republic of Korea; Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea) ; Javier G. Subils (Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos (ICC), Universitat de Barcelona, Martí Franquès 1, ES-08028 Barcelona, Spain; Nordita KTH Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, SE-106 91 Stockholm, Sweden) ; Javier Tarrío (Department of Physics and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 University of Helsinki, Finland) ; et al. - Show all 6 authors

The transport properties of dense QCD matter play a crucial role in the physics of neutron stars and their mergers but are notoriously difficult to study with traditional quantum field theory tools. Specializing to the case of unpaired quark matter in beta equilibrium, we approach the problem through the machinery of holography, in particular the V-QCD and D3-D7 models, and derive results for the electrical and thermal conductivities and the shear and bulk viscosities. In addition we compare the bulk to shear viscosity ratio to the speed of sound and find that it violates the so-called Buchel bound. Our results differ dramatically from earlier predictions of perturbative QCD, the root causes and implications of which we analyze in detail.

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Published on:
25 March 2022
Publisher:
APS
Published in:
Physical Review D , Volume 105 (2022)
Issue 6
DOI:
https://doi.org/10.1103/PhysRevD.105.066014
arXiv:
2109.12122
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: