Debye screening mass near deconfinement from holography

作者：Finazzo S I^*; Noronha J

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, 90(11): 115028.

DOI：10.1103/PhysRevD.90.115028

In this paper the smallest thermal screening mass associated with the correlator of the CT-odd operator, similar to TrF mu upsilon(F) over tilde (mu upsilon), is determined in strongly coupled non-Abelian gauge plasmas which are holographically dual to nonconformal, bottom-up Einstein + scalar gravity theories. These holographic models are constructed to describe the thermodynamical properties of SU(N-c) plasmas near deconfinement at large N-c, and we identify this thermal mass with the Debye screening mass m(D). In this class of nonconformal models with a first-order deconfinement transition at T-c the Debye screening mass m(D) displays the same behavior found for the expectation value of the Polyakov loop (which we also compute) jumping from zero below T-c to a nonzero value just above the transition. In the case of a crossover phase transition, m(D)/T has a minimum similar to that found for the speed of sound squared c(s)(2). This holographic framework is also used to evaluate m(D) as a function of eta/s in a strongly coupled conformal gauge plasma dual to Gauss-Bonnet gravity. In this case, m(D)/T decreases with increasing eta/s in accordance with extrapolations from weak coupling calculations.

• 出版日期2014-12-30