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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Transport in Strongly Coupled Quark Matter.

Carlos Hoyos¹, Matti Järvinen², Niko Jokela³

¹Department of Physics and Instituto de Ciencias y Tecnologías Espaciales de Asturias (ICTEA) Universidad de Oviedo, c/ Federico Garciía Lorca 18, ES-33007 Oviedo, Spain.

Physical Review Letters

|January 7, 2021

Summary

We studied transport properties of dense quark matter relevant to neutron stars. Our findings using gauge/gravity duality differ from perturbation theory, suggesting caution for neutron star applications.

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Area of Science:

Nuclear Physics
High-Energy Physics
Astrophysics

Background:

Deconfined quark matter may exist in neutron stars and their mergers.
Transport phenomena are crucial for understanding these dense systems.

Purpose of the Study:

To conduct the first systematic study of viscosities and conductivities of dense quark matter.
To investigate these properties using the gauge/gravity duality framework.

Main Methods:

Employed the V-QCD model, a holographic approach.
Applied gauge/gravity duality to model dense quark matter.

Main Results:

Obtained results for transport coefficients in qualitative disagreement with perturbation theory.
Demonstrated differing transport properties between weak and strong coupling regimes.

Conclusions:

Perturbative predictions may not accurately describe dense quark matter in neutron stars.
Results highlight the importance of non-perturbative methods for astrophysical applications.