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Strongly coupled heavy and light quark thermal motion from AdS/CFT. (English) Zbl 1483.81148

Summary: We give a pedagogical presentation of heavy and light probe quarks in a thermal plasma using the AdS/CFT correspondence. Three cases are considered: external heavy and light quarks undergoing Brownian motion in the plasma, and an external heavy quark moving through the plasma with a constant velocity. For the first two cases we compute the mean-squared transverse displacement of the string’s boundary endpoint. At early times the behaviour is ballistic, while the late time dynamics are diffusive. We extract the diffusion coefficient for both heavy and light quarks in an arbitrary number of dimensions and comment on the relevance for relativistic heavy ion phenomenology.

MSC:

81V05 Strong interaction, including quantum chromodynamics
81V35 Nuclear physics
81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
60G22 Fractional processes, including fractional Brownian motion
81T35 Correspondence, duality, holography (AdS/CFT, gauge/gravity, etc.)

Software:

Rubi; Mathematica

References:

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