Collective modes in anisotropic plasmas

Abstract

We study collective modes in anisotropic plasmas of quarks and gluons using a quasi-particle picture and a hard loop approximation. We use a general class of anisotropic distribution functions, and we consider chirally asymmetric systems. We introduce a complete tensor basis to decompose the gluon polarization tensor into a set of nine scalar functions. We derive and solve the corresponding dispersion equations. Imaginary modes are particularly important because of their potential influence on plasma dynamics. We explore in detail their dependence on the chiral chemical potential and the parameters that characterise the anisotropy of the system. We show that our generalized distributions produce dispersion relations that are much richer in structure than those obtained with a simple one parameter deformation of an isotropic distribution. In addition, the size and domain of the imaginary solutions are enhanced, relative to those obtained with a one parameter deformation. Finally, we show that the influence of even a very small chiral chemical potential is significantly magnified when anisotropy is present.

31 pages, 13 figures, published version

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Cited by in corpus (6)

• Chiral effects in astrophysics and cosmology
• The momentum broadening of energetic partons in an anisotropic plasma
• Impact of chiral asymmetry and magnetic field on passage of an energetic test parton in a QCD medium
• Collective modes of gluons in an anisotropic thermo-magnetic medium
• Quark matter with an anisotropic momentum distribution
• Collective excitations in the hot QCD medium and the propagation of Heavy Quarks