Pion dynamics in a soft-wall AdS-QCD model

Cao, Xuanmin; Baggioli, Matteo; Liu, Hui; Li, Danning

doi:10.1007/jhep12(2022)113

Cited by 11 publications

(5 citation statements)

References 93 publications

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“…• Quenches in our holographic superconductor model could be useful tools to explore the collective dynamics beyond linear approximation. In particular, one might think of extending the analysis of [100,101] to this case and use GL theory to interpret the numerical results. Nonlinear response is expected to be an excellent probe for the dynamics of the Higgs mode which is usually undetectable in the linear response regime [115].…”

Section: Discussionmentioning

confidence: 99%

“…and also with the holographic results for superfluids in [75] and the analysis of [84] (see also [100,101]). Interestingly, by decreasing the temperature, this mode collides with a first nonhydrodynamic higher pole (indicated with blue color in Fig.…”

Section: 3mentioning

confidence: 91%

“…More in general, in order to consider the near-critical dynamics of a superfluid, and in particular to obtain also propagating modes, one needs to couple the dynamics of the order parameter to the conserved charge density [93]. For superfluids, this procedure will automatically end up in the so-called model F in the Hoenberg-Halperin classification [99] (see also [87] for a holographic derivation of this dynamics in the holographic superfluid model, [100,101] for a study of the nonlinear dynamics and [102] for an analysis of the universality class of holographic superconductors). It would be interesting to extend the model F in order to account for a dynamical gauge field and the coupling between the different modes.…”

Section: Dissipative Effectsmentioning

confidence: 99%

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Collective dynamics and the Anderson-Higgs mechanism in a bona fide holographic superconductor

Jeong¹,

Baggioli²,

Kim³

et al. 2023

Preprint

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The holographic superconductor is one of the most popular models in the context of applied holography. Despite what its name suggests, it does not describe a superconductor. On the contrary, the low temperature phase of its dual field theory is a superfluid with a spontaneously broken U(1) global symmetry. As already observed in the previous literature, a bona fide holographic superconductor can be constructed using mixed boundary conditions for the bulk gauge field. By exploiting this prescription, we study the near-equilibrium collective dynamics in the Higgs phase and reveal the characteristic features of the Anderson-Higgs mechanism. We show that second sound disappears from the spectrum and the gauge field acquires a finite energy gap of the order of the plasma frequency. We observe an overdamped to underdamped crossover for the Higgs mode which acquires a finite energy gap below ≈ T c /2, with T c the superconducting critical temperature. Interestingly, the energy gap of the Higgs mode at low temperature is significantly smaller than 2∆, with ∆ the superconducting energy gap. Finally, we interpret our results using Ginzburg-Landau theory and we confirm the validity of previously derived perturbative analytic expressions.

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Section: Discussionmentioning

confidence: 99%

Section: 3mentioning

confidence: 91%

Section: Dissipative Effectsmentioning

confidence: 99%

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Collective dynamics and the Anderson-Higgs mechanism in a bona fide holographic superconductor

Jeong¹,

Baggioli²,

Kim³

et al. 2023

Preprint

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“…Finally, we consider the light quark at the end of the string as a tachyon field, which couples to the worldsheet boundary by [56,57]. This term is typical for strings propagating in an open string tachyon background and is its background scalar [56].…”

Section: Qqqmentioning

confidence: 99%

Moving doubly heavy baryon in a strongly coupled plasma via holography*

Liu 刘,

Jiang 江,

Chen 陈

et al. 2024

Chinese Phys. C

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Gauge/gravity duality is used to study properties of the doubly heavy baryon $(\mathrm{QQq})$ at finite rapidity and temperature in the heavy-ion collision. We investigate the impact of rapidity on string breaking and screening of $\mathrm{QQq}$, and compare these effects with the results for $\rm Q\bar{Q}$ in detail. Computations reveal that the string-breaking distances of $\mathrm{QQq}$ and $\rm Q\bar{Q}$ are close in the confined state and the effects of rapidity and temperature on the string breaking are not significant. An interesting result shows that $\mathrm{QQq}$ cannot be found at high enough temperatures and rapidities; however, $\rm Q\bar{Q}$ can exist under any conditions as long as the separation distance is small enough. Besides, the screening distances of $\mathrm{QQq}$ and $\rm Q\bar{Q}$ are also compared at finite rapidity and temperature. Based on the above analysis, we infer that $\rm Q\bar{Q}$ is more stable than $\mathrm{QQq}$ at finite rapidity and temperature.Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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“…Hydrodynamics and effective field theory with explicitly broken symmetries have been recently considered in the context of translational symmetry [47][48][49][50][51][52][53], U(1) symmetry [51,54,55], non-Abelian symmetries [56][57][58] and also higher-form symmetries [59,60]. Holography has played a fundamental role both in verifying but also falsifying the proposed effective descriptions (see for example [19]).…”

Section: Jhep09(2023)019mentioning

confidence: 99%

U(1) quasi-hydrodynamics: Schwinger-Keldysh effective field theory and holography

Baggioli,

Bu,

Ziogas

2023

J. High Energ. Phys.

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We study the quasi-hydrodynamics of a system with a softly broken U(1) global symmetry using effective field theory (EFT) and holographic methods. In the gravity side, we consider a holographic Proca model in the limit of small bulk mass, which is responsible for a controllable explicit breaking of the U(1) global symmetry in the boundary field theory. We perform a holographic Schwinger-Keldysh analysis, which allows us to derive the form of the boundary effective action in presence of dissipation. We compare our results with the previously proposed EFT and hydrodynamic theories, and we confirm their validity by computing the low-energy quasi-normal modes spectrum analytically and numerically. Additionally, we derive the broken holographic Ward identity for the U(1) current, and discuss the recently proposed novel transport coefficients for systems with explicitly broken symmetries. The setup considered is expected to serve as a toy model for more realistic situations where quasi-hydrodynamics is at work, such as axial charge relaxation in QCD, spin relaxation in relativistic systems, electric field relaxation in magneto-hydrodynamics, or momentum relaxation in condensed matter systems.

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Pion dynamics in a soft-wall AdS-QCD model

Cited by 11 publications

References 93 publications

Collective dynamics and the Anderson-Higgs mechanism in a bona fide holographic superconductor

Collective dynamics and the Anderson-Higgs mechanism in a bona fide holographic superconductor

Moving doubly heavy baryon in a strongly coupled plasma via holography*

U(1) quasi-hydrodynamics: Schwinger-Keldysh effective field theory and holography

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