Critical behavior of non-hydrodynamic quasinormal modes in a strongly coupled plasma

dc.contributor.authorFinazzo, Stefano I.
dc.contributor.authorRougemont, Romulo
dc.contributor.authorZaniboni, Maicon
dc.contributor.authorCritelli, Renato
dc.contributor.authorNoronha, Jorge
dc.contributor.institutionUniversidade do Estado de São Paulo
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.description.abstractWe study the behavior of quasinormal modes in a top-down holographic dual corresponding to a strongly coupled N= 4 super Yang-Mills plasma charged under a U(1) subgroup of the global SU(4) R-symmetry. In particular, we analyze the spectra of quasi-normal modes in the external scalar and vector diffusion channels near the critical point and obtain the behavior of the characteristic equilibration times of the plasma as the system evolves towards the critical point of its phase diagram. Except close to the critical point, we observe that by increasing the chemical potential one generally increases the damping rate of the quasinormal modes, which leads to a reduction of the characteristic equilibration times in the dual strongly coupled plasma. However, as one approaches the critical point the typical equilibration time (as estimated from the lowest non-hydrodynamic quasinormal mode frequency) increases, although remaining finite, while its derivative with respect to the chemical potential diverges with exponent -1/2. We also find a purely imaginary non-hydrodynamical mode in the vector diffusion channel at nonzero chemical potential which dictates the equilibration time in this channel near the critical point.en
dc.description.affiliationInstituto de Física Teórica Universidade do Estado de São Paulo, Rua Dr. Bento T. Ferraz, 271
dc.description.affiliationInstituto de Física Universidade de São Paulo, Rua do Matão, 1371, Butantã
dc.identifier.citationJournal of High Energy Physics, v. 2017, n. 1, 2017.
dc.relation.ispartofJournal of High Energy Physics
dc.subjectPhase Diagram of QCD
dc.subjectQuark-Gluon Plasma
dc.titleCritical behavior of non-hydrodynamic quasinormal modes in a strongly coupled plasmaen