Holographic magnetized chiral density wave

Bu, Yanyan; Lin, Shu

doi:10.1088/1674-1137/42/11/114104

Cited by 7 publications

(4 citation statements)

References 47 publications

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“…where the integration constant c 1 should be set to zero due to asymptotic AdS requirement (37). By redefinition of the radial coordinate r , we could also set c 2 = 0.…”

Section: Resultsmentioning

confidence: 99%

Magneto-vortical effect in strongly coupled plasma

Lin

2020

Eur. Phys. J. C

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Based on a holographic model incorporating both the chiral anomaly and the gravitational anomaly, we study the effect of magneto-vortical coupling on the transport properties of a strongly coupled plasma. The focus of present work is on the generation of a vector charge density and an axial current, as response to vorticity in a magnetized plasma. The transport coefficients parameterizing the vector charge density and axial current are calculated both analytically (in the weak magnetic field limit) and also numerically (for general values of the magnetic field). We find the generation of vector charge receives both non-anomalous and anomalous contributions, with the non-anomalous contribution dominating in the limit of a strong magnetic field and the anomalous contribution sensitive to both chiral anomaly and gravitational anomaly. On the contrary, we find the axial current is induced entirely due to the gravitational anomaly, thus we interpret the axial current generation as chiral vortical effect. The corresponding chiral vortical conductivity is found to be suppressed by the magnetic field. By the Onsager relation, these transport coefficients are responsible for the generation of a thermal current due to a transverse electric field or a transverse axial magnetic field, which we call the thermal Hall effect and the thermal axial magnetic effect, respectively.

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“…where the integration constant c 1 should be set to zero due to asymptotic AdS requirement (37). By redefinition of the radial coordinate r , we could also set c 2 = 0.…”

Section: Resultsmentioning

confidence: 99%

Magneto-vortical effect in strongly coupled plasma

Lin

2020

Eur. Phys. J. C

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“…A similar ansatz for φ, in the presence of a magnetic field, has appeared in refs. [53,54]. Crucially, because of the background's Killing symmetry that shifts φ, the D7-branes' action will depend only on derivatives of φ, and hence with our ansatz will not depend explicitly on z.…”

Section: Jhep04(2021)162mentioning

confidence: 99%

A Weyl semimetal from AdS/CFT with flavour

Fadafan

O’Bannon

Rodgers

et al. 2021

J. High Energ. Phys.

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We construct a top-down holographic model of Weyl semimetal states using (3 + 1)-dimensional $$ \mathcal{N} $$ N = 4 supersymmetric SU(Nc) Yang-Mills theory, at large Nc and strong coupling, coupled to a number Nf ≪ Nc of $$ \mathcal{N} $$ N = 2 hypermultiplets with mass m. A U(1) subgroup of the R-symmetry acts on the hypermultiplet fermions as an axial symmetry. In the presence of a constant external axial gauge field in a spatial direction, b, we find the defining characteristic of a Weyl semi-metal: a quantum phase transition as m/b increases, from a topological state with non-zero anomalous Hall conductivity to a trivial insulator. The transition is first order. Remarkably, the anomalous Hall conductivity is independent of the hypermultiplet mass, taking the value dictated by the axial anomaly. At non-zero temperature the transition remains first order, and the anomalous Hall conductivity acquires non-trivial dependence on the hypermultiplet mass and temperature.

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“…The equations of motion corresponding to the fluctuation of scalar and pseudoscalar decouple from each other [33]. Here, we ignore the fluctuation of the pseudoscalar similar to [34], where they perturbed the gauge and scalar fields.…”

Section: Adding Pseudoscalar Fieldmentioning

confidence: 99%

“…so that b is an axial field and z is one of the boundary field theory space directions. In the presence of a magnetic field, a similar ansatz has been considered in [33,38] and the chiral helix studied. As it was studied in [37], in the presence of an electric field, the b field causes interesting transport due to the axial anomaly.…”

Section: Adding Pseudoscalar Fieldmentioning

confidence: 99%

Anomalous dimension and quasinormal modes of flavor branes

Atashi¹,

Fadafan²

2022

Preprint

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We study scalar quasinormal modes in a D3/D7 system holographically dual to a quantum field theory with chiral symmetry breaking at finite temperature. We find a pure imaginary mode for massless quarks which depends on the anomalous dimension of quark condensate. This mode becomes tachyonic for massive quarks and we show that there is a critical momentum above which the system is stable. Then we turn on a pseudoscalar field and using a simple ansatz study its effect on the quasinormal modes of the scalar field. By varying the parameter of the non trivial dilaton profile in the model, we qualitatively study quasinormal modes in walking theories.

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Holographic magnetized chiral density wave

Cited by 7 publications

References 47 publications

Magneto-vortical effect in strongly coupled plasma

Magneto-vortical effect in strongly coupled plasma

A Weyl semimetal from AdS/CFT with flavour

Anomalous dimension and quasinormal modes of flavor branes

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