QCD phase diagram at finite isospin chemical potential and temperature in an IR-improved soft-wall AdS/QCD model *

Cao, Xuanmin; Liu, Hui; Li, Danning; Ou, Guanning

doi:10.1088/1674-1137/44/8/083106

Cited by 18 publications

(9 citation statements)

References 87 publications

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“…Thus, we are not yet in a position to compare our results to up-to-date lattice QCD simulations at finite µ I (see, e.g., refs. [73][74][75][76][77]), where a phase with Bose-Einstein condensation of charged pions was observed. As a next step, it might therefore be interesting to establish contact with refs.…”

Section: Discussionmentioning

confidence: 99%

Inhomogeneous Phases in the Chirally Imbalanced 2 + 1-Dimensional Gross-Neveu Model and Their Absence in the Continuum Limit

2022

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We studied the μ-μ45-T phase diagram of the 2+1-dimensional Gross-Neveu model, where μ denotes the ordinary chemical potential, μ45 the chiral chemical potential and T the temperature. We use the mean-field approximation and two different lattice regularizations with naive chiral fermions. An inhomogeneous phase at finite lattice spacing was found for one of the two regularizations. Our results suggest that there is no inhomogeneous phase in the continuum limit. We showed that a chiral chemical potential is equivalent to an isospin chemical potential. Thus, all results presented in this work can also be interpreted in the context of isospin imbalance.

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Section: Discussionmentioning

confidence: 99%

Inhomogeneous Phases in the Chirally Imbalanced 2 + 1-Dimensional Gross-Neveu Model and Their Absence in the Continuum Limit

2022

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“…There are many well-constructed holographic QCD models in the bottom-up approach, like the hard wall model [43], the soft-wall model [44], the Einstein-Maxwell-Dilaton systems [45][46][47][48][49] and the light-front holographic QCD [50]. Among these models, the soft-wall AdS/QCD model and its extensions can describe the hadronic spectrum and relevant quantities [51][52][53][54][55][56][57][58], and the JHEP08(2021)005 chiral phase transition [59][60][61][62][63][64][65][66][67][68][69]. It provides an excellent scenario to consider the light scalar (σ), pseudo-scalar (π), vector (ρ), axial-vector (a 1 ) mesons simultaneously in a consistent way.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of light mesons from holography

Cao

Qiu

Liu

et al. 2021

J. High Energ. Phys.

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The thermal properties of light mesons, including the temperature dependence of their masses (both screening and pole masses) and thermal widths, are studied in a two-flavor (Nf = 2) soft-wall AdS/QCD model. By solving the spatial correlation functions, we extract the screening masses (mscr) from their poles. The screening masses of pseudo-scalar (π) and axial-vector (a1) mesons increase almost monotonously with the increase of temperature. The screening masses of scalar (σ) and vector (ρ) mesons decrease at low temperature and increase at high temperature. The pole masses (mpole) and the thermal widths (Γ) are extracted from the temporal correlation functions and the corresponding spectral functions. The results indicate that the pole masses have local minima at low temperature and increase at high temperature. The thermal widths increase rapidly above the chiral crossover temperature Tcp, indicating the dissociations of mesons at high temperature. Furthermore, the degeneration of the chiral partners (π and σ, ρ and a1) above Tcp is observed from the screening and pole masses, revealing the chiral symmetry restoration at the hadronic spectrum level. Finally, we numerically verify that the spectral functions in the temporal regime are strongly related to the quasi-normal modes with complex frequencies ω0 = mpole− iΓ/2.

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“…Making use of this correspondence many works were done in order to study hot dense QGP [19][20][21][22][23][24], considering finite chemical potentials (or some related topics as for instance, QCD phase transition, chiral symmetry breaking, critical exponents, etc. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]) and quantum or thermal fluctuations such as the Brownian motion [40][41][42][43][44][45][46], fluctuation and dissipation [47][48][49][50][51][52][53][54][55], drag forces [56][57][58][59][60], or related topics [61][62][63][64][65][66].…”

Section: Introductionmentioning

confidence: 99%

Fluctuation and dissipation within a deformed holographic model with backreaction

et al. 2021

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In this work we study fluctuations and dissipation of a string in a deformed anti-de Sitter (AdS) space at finite temperature and density. The deformed AdS space is a charged black hole solution of the Einstein-Maxwell-Dilaton action. In this background we take into account the backreaction on the horizon function from an exponential deformation of the AdS space. In this set up, we study the equations of motion of the string from the Nambu-Goto action. The motion of the string endpoint describes holographically the fluctuations and dissipation of a particle moving in a four-dimensional Minkowski space. From this model we compute the admittance and study its behavior against the temperature for some values of the chemical potential. In order to obtain the two-point correlations functions, and the mean square displacement we consider separately the bosonic and fermionic cases with µ < 0 and µ > 0, respectively. From the regularized mean square displacements of the bosonic and fermionic cases we obtain the short and large time approximations. For the short time case we find the usual ballistic regime, and for the long time case we obtain a sub-diffusive regime characteristic of a ultra-slow scaled Brownian motion. Combining the results from the admittance and mean square displacements we also study the fluctuation-dissipation theorem.

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QCD phase diagram at finite isospin chemical potential and temperature in an IR-improved soft-wall AdS/QCD model *

Cited by 18 publications

References 87 publications

Inhomogeneous Phases in the Chirally Imbalanced 2 + 1-Dimensional Gross-Neveu Model and Their Absence in the Continuum Limit

Inhomogeneous Phases in the Chirally Imbalanced 2 + 1-Dimensional Gross-Neveu Model and Their Absence in the Continuum Limit

Thermal properties of light mesons from holography

Fluctuation and dissipation within a deformed holographic model with backreaction

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