Sound waves in strongly coupled non-conformal gauge theory plasma

Gauge/string correspondence provides an efficient method to investigate gauge theories. In this talk we discuss the results of the paper (to appear) by P. Benincasa, A. Buchel and A. O. Starinets, where the propagation of sound waves is studied in a strongly coupled non-conformal gauge theory plasma. In particular, a prediction for the speed of sound as well as for the bulk viscosity is made for the [Formula: see text] gauge theory in the high temperature limit. As expected, the results achieved show a deviation from the speed of sound and the bulk viscosity for a conformal theory. It is pointed out that such results depend on the particular gauge theory considered.

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Review of strongly-coupled composite dark matter models and lattice simulations

International Journal of Modern Physics A ◽

10.1142/s0217751x16430041 ◽

2016 ◽

Vol 31 (22) ◽

pp. 1643004 ◽

Cited By ~ 37

Author(s):

Graham D. Kribs ◽

Ethan T. Neil

Keyword(s):

Dark Matter ◽

Gauge Theory ◽

Direct Detection ◽

Bound State ◽

New Physics ◽

Abelian Gauge ◽

Strongly Coupled ◽

Abelian Gauge Theory ◽

Lattice Calculations ◽

Composite Description

We review models of new physics in which dark matter arises as a composite bound state from a confining strongly-coupled non-Abelian gauge theory. We discuss several qualitatively distinct classes of composite candidates, including dark mesons, dark baryons, and dark glueballs. We highlight some of the promising strategies for direct detection, especially through dark moments, using the symmetries and properties of the composite description to identify the operators that dominate the interactions of dark matter with matter, as well as dark matter self-interactions. We briefly discuss the implications of these theories at colliders, especially the (potentially novel) phenomenology of dark mesons in various regimes of the models. Throughout the review, we highlight the use of lattice calculations in the study of these strongly-coupled theories, to obtain precise quantitative predictions and new insights into the dynamics.

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Heavy quark thermalization in classical lattice gauge theory: lessons for strongly-coupled QCD

Journal of High Energy Physics ◽

10.1088/1126-6708/2009/05/014 ◽

2009 ◽

Vol 2009 (05) ◽

pp. 014-014 ◽

Cited By ~ 13

Author(s):

Mikko Laine ◽

Guy D Moore ◽

Owe Philipsen ◽

Marcus Tassler

Keyword(s):

Gauge Theory ◽

Heavy Quark ◽

Lattice Gauge Theory ◽

Classical Lattice ◽

Strongly Coupled ◽

Lattice Gauge

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Evidence for weak-coupling holography from the gauge/gravity correspondence for Dp-branes

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptz167 ◽

2020 ◽

Vol 2020 (2) ◽

Author(s):

Yasuhiro Sekino

Keyword(s):

Gauge Theory ◽

Free Field ◽

Scalar Fields ◽

Superstring Theory ◽

Spatial Direction ◽

Strongly Coupled ◽

Yang Mills ◽

Hooft Coupling ◽

Brane Solution ◽

Gauge Gravity

Abstract Gauge/gravity correspondence is regarded as a powerful tool for the study of strongly coupled quantum systems, but its proof is not available. An unresolved issue that should be closely related to the proof is what kind of correspondence exists, if any, when gauge theory is weakly coupled. We report progress about this limit for the case associated with D$p$-branes ($0\le p\le 4$), namely, the duality between the $(p+1)$D maximally supersymmetric Yang–Mills theory and superstring theory on the near-horizon limit of the D$p$-brane solution. It has been suggested by supergravity analysis that the two-point functions of certain operators in gauge theory obey a power law with the power different from the free-field value for $p\neq 3$. In this work, we show for the first time that the free-field result can be reproduced by superstring theory on the strongly curved background. The operator that we consider is of the form ${\rm Tr}(Z^J)$, where $Z$ is a complex combination of two scalar fields. We assume that the corresponding string has the worldsheet spatial direction discretized into $J$ bits, and use the fact that these bits become non-interacting when ’t Hooft coupling is zero.

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