A universal order parameter for Inverse Magnetic Catalysis

Ballon-Bayona, Alfonso; Ihl, Matthias; Shock, Jonathan P.; Zoakos, Dimitrios

doi:10.1007/jhep10(2017)038

Cited by 36 publications

(23 citation statements)

References 108 publications

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“…In order to do so we defined the quantity "anisotropic susceptibility" in analogy to the magnetic susceptibility. This susceptibility was then identified as a natural order parameter, similar to what was done in [45,47] for the magnetic case. We then obtained a relation between the critical temperature of the first order transition and the anisotropic susceptibility in Eq.…”

Section: Discussionmentioning

confidence: 91%

“…The gauge/gravity duality is established as a powerful theoretical tool to study especially the qualitative aspects of a large class of strongly-coupled gauge theories in a completely nonperturbative manner. Several works have already approached the problem of the dependence of the condensate on the magnetic field in the holographic context, including [39][40][41][42][43][44][45][46][47][48][49][50][51]. In [45], in particular, the authors gave a heuristic explanation of the IMC inspired by the aforementioned competition between the valence v.s the sea quarks but translated in the gravity language.…”

Section: )mentioning

confidence: 99%

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Inverse anisotropic catalysis in holographic QCD

Gürsoy

Järvinen

Nijs

et al. 2019

J. High Energ. Phys.

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We investigate the effects of anisotropy on the chiral condensate in a holographic model of QCD with a fully backreacted quark sector at vanishing chemical potential. The high temperature deconfined phase is therefore a neutral and anisotropic plasma showing different pressure gradients along different spatial directions, similar to the state produced in noncentral heavy-ion collisions. We find that the chiral transition occurs at a lower temperature in the presence of anisotropy. Equivalently, we find that anisotropy acts destructively on the chiral condensate near the transition temperature. These are precisely the same footprints as the "inverse magnetic catalysis" i.e. the destruction of the condensate with increasing magnetic field observed earlier on the lattice, in effective field theory models and in holography. Based on our findings we suggest, in accordance with the conjecture of [1], that the cause for the inverse magnetic catalysis may be the anisotropy caused by the presence of the magnetic field instead of the charge dynamics created by it. We conclude that the weakening of the chiral condensate due to anisotropy is more general than that due to a magnetic field and we coin the former "inverse anisotropic catalysis". Finally, we observe that any amount of anisotropy changes the IR physics substantially: the geometry is AdS 4ˆR up to small corrections, confinement is present only up to a certain scale, and the particles acquire finite widths.

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Section: Discussionmentioning

confidence: 91%

Section: )mentioning

confidence: 99%

Inverse anisotropic catalysis in holographic QCD

Gürsoy

Järvinen

Nijs

et al. 2019

J. High Energ. Phys.

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show abstract

“…There are also some other works on chiral phase transition in holographic QCD [67][68][69][70][71][72]. Studies on QCD phase transitions under magnetic fields can be referred to [73][74][75][76][77][78]. As the chiral phase transition is related to the chiral dynamics of QCD, a satisfying holographic description of chiral transition should combine with other important low-energy properties of hadron physics, in which the chiral symmetry breaking plays a dominant role.…”

Section: Introductionmentioning

confidence: 99%

Chiral phase transition with 2+1 quark flavors in an improved soft-wall AdS/QCD model

Fang

Lin

2018

Phys. Rev. D

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We study the chiral phase transition with 2 + 1 quark flavors in an improved soft-wall AdS/QCD model, which can produce the light meson spectrum and many other low-energy quantities consistent with experiments in the two-flavor case. The chiral transition behaviors of the quark condensates at different quark masses are analysed in detail, and the (m u,d , m s ) phase diagram for the quark sector has been obtained from the improved soft-wall model. We find that the features of the calculated phase diagram are completely consistent with the standard scenario, which is supported by lattice simulations and theoretical arguments. The evidence of a tricritical point on the m u,d = 0 boundary of the (m u,d , m s ) phase diagram is first clearly presented in the bottom-up AdS/QCD.

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“…Now using eqs. (23), (25) and (26) and considering a plane wave solution with momentum p = (ω, 0, 0, p 3 ), the previous equation forσ L becomes…”

Section: Spectral Functionmentioning

confidence: 99%

Heavy meson dissociation in a plasma with magnetic fields

Braga

Ferreira

2018

Physics Letters B

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The fraction of heavy vector mesons detected after a heavy ion collision provides information about the possible formation of a plasma state. An interesting framework for estimating the degree of dissociation of heavy mesons in a plasma is the holographic approach. It has been recently shown that a consistent picture for the thermal behavior of charmonium and bottomonium states in a thermal medium emerges from holographic bottom up models. A crucial ingredient in this new approach is the appropriate description of decay constants, since they are related to the heights of the quasiparticle peaks of the finite temperature spectral function.Here we extend this new holographic model in order to study the effect of magnetic fields on the thermal spectrum of heavy mesons. The motivation is that very large magnetic fields are present in non central heavy ion collisions and this could imply a change in the dissociation scenario. The thermal spectra of cc and bb S wave states is obtained for different temperatures and different values of the magnetic eB field. *

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A universal order parameter for Inverse Magnetic Catalysis

Cited by 36 publications

References 108 publications

Inverse anisotropic catalysis in holographic QCD

Inverse anisotropic catalysis in holographic QCD

Chiral phase transition with 2+1 quark flavors in an improved soft-wall AdS/QCD model

Heavy meson dissociation in a plasma with magnetic fields

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