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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chern-Simons diffusion rate across different phase transitions

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Rougemont, Romulo [1] ; Finazzo, Stefano Ivo [2]
Total Authors: 2
[1] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Estado Sao Paulo, Inst Fis Teor, Rua Dr Bento T Ferraz 271, BR-01140070 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Review D; v. 93, n. 10 MAY 24 2016.
Web of Science Citations: 2

We investigate how the dimensionless ratio given by the Chern-Simons diffusion rate Gamma(CS) divided by the product of the entropy density s and temperature T behaves across different kinds of phase transitions in the class of bottom-up nonconformal Einstein-dilaton holographic models originally proposed by Gubser and Nellore. By tuning the dilaton potential, one is able to holographically mimic a first order, a second order, or a crossover transition. In a first order phase transition, Gamma(CS)/sT jumps at the critical temperature (as previously found in the holographic literature), while in a second order phase transition it develops an infinite slope. On the other hand, in a crossover, Gamma(CS)/sT behaves smoothly, although displaying a fast variation around the pseudo-critical temperature. In all the cases, Gamma(CS)/sT increases with decreasing T. The behavior of the Chern-Simons diffusion rate across different phase transitions is expected to play a relevant role for the chiral magnetic effect around the QCD critical end point, which is a second order phase transition point connecting a crossover band to a line of first order phase transition. Our findings in the present work add to the literature the first predictions for the Chern-Simons diffusion rate across second order and crossover transitions in strongly coupled nonconformal, non-Abelian gauge theories. (AU)

FAPESP's process: 13/04036-0 - Computation of the properties of the quark-gluon plasma at nonzero temperature and baryonic density using the holographic correspondence
Grantee:Rômulo Cesar Rougemont Pereira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/00240-7 - Applications of the gauge/gravity duality in non-perturbative phenomena
Grantee:Stefano Ivo Finazzo
Support type: Scholarships in Brazil - Post-Doctorate