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1. Bayesian location of the QCD critical point: A holographic perspective

   https://doi.org/10.1051/epjconf/202531606004  

   Ratti, Claudia; Grefa, Joaquin; Hippert, Mauricio; Manning, T Andrew; Noronha, Jorge; Noronha-Hostler, Jacquelyn; Vazquez, Israel Portillo; Rougemont, Romulo; Trujillo, Michael (January 2025, EPJ Web of Conferences)

   Cheshkov, C; Guernane, R; Maire, A (Ed.)

   We present a Bayesian analysis, based on holography and constrained by lattice QCD simulations, which leads to a prediction for the existence and location of the QCD critical point. We employ two different parametrizations of the functions that characterize the breaking of conformal invariance and the baryonic charge in the Einstein-Maxwell-dilaton holographic model. They lead to predictions for the critical point that overlap at one sigma. While some samples of the prior distribution do not predict a critical point, or produce critical points that cover large regions of the phase diagram, all posterior samples present a critical point at chemical potentials µBc~550-630 MeV. 

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2. Equation of State and Energy Loss of Hot and Dense Quark-Gluon matter from Holographic Black Holes

   https://doi.org/10.1051/epjconf/202327601013  

   Grefa, Joaquin; Hippert, Mauricio; Noronha, Jorge; Noronha-Hostler, Jacquelyn; Portillo, Israel; Ratti, Claudia; Rougemont, Romulo (January 2023, EPJ Web of Conferences)

   Kim, Y.; Moon, D.H. (Ed.)

   By using gravity/gauge correspondence, we construct a holographic model, constrained to mimic the lattice QCD equation of state at zero density, to investigate the temperature and baryon chemical potential dependence of the equation of state. We also obtained the energy loss of light and heavy partons within the hot and dense plasma represented by the heavy quark drag force, Langevin diffusion coefficients and jet quenching parameter at the critical point and across the first-order transition line predicted by the model. 

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3. QCD Equilibrium and Dynamical Properties from Holographic Black Holes

   https://doi.org/10.31349/SuplRevMexFis.3.040910  

   Grefa, Joaquin; Hippert, Mauricio; Noronha, Jorge; Noronha-Hostler, Jacquelyn; Portillo, Israel; Ratti, Claudia; Rougemont, Romulo (December 2022, Suplemento de la Revista Mexicana de Física)

   By using gravity/gauge correspondence, we employ an Einstein-Maxwell-Dilaton model to compute the equilibrium and out-of-equilibrium properties of a hot and baryon rich strongly coupled quark-gluon plasma. The family of 5-dimensional holographic black holes, which are constrained to mimic the lattice QCD equation of state at zero density, is used to investigate the temperature and baryon chemical potential dependence of the equation of state. We also obtained the baryon charge conductivity, and the bulk and shear viscosities with a particular focus on the behavior of these observables on top of the critical end point and the line of first order phase transition predicted by the model. 

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4. Lattice-QCD-based equations of state at finite temperature and density

   https://doi.org/10.31349/SuplRevMexFis.3.040907  

   Karthein, Jamie M.; Mroczek, Debora; Nava Acuña, Angel R.; Noronha-Hostler, Jacquelyn; Parotto, Paolo; Price, Damien R.; Ratti, Claudia (December 2022, Suplemento de la Revista Mexicana de Física)

   The equation of state (EoS) of QCD is a crucial input for the modeling of heavy-ion-collision (HIC) and neutron-star-merger systems. Calculations of the fundamental theory of QCD, which could yield the true EoS, are hindered by the infamous Fermi sign problem which only allows direct simulations at zero or imaginary baryonic chemical potential. As a direct consequence, the current coverage of the QCD phase diagram by lattice simulations is limited. In these proceedings, two different equations of state based on first-principle lattice QCD (LQCD) calculations are discussed. The first is solely informed by the fundamental theory by utilizing all available diagonal and non-diagonal susceptibilities up to O(µ 4 B) in order to reconstruct a full EoS at finite baryon number, electric charge and strangeness chemical potentials. For the second, we go beyond information from the lattice in order to explore the conjectured phase structure, not yet determined by LQCD methods, to assist the experimental HIC community in their search for the critical point. We incorporate critical behavior into this EoS by relying on the principle of universality classes, of which QCD belongs to the 3D Ising Model. This allows one to study the effects of a singularity on the thermodynamical quantities that make up the equation of state used for hydrodynamical simulations of HICs. Additionally, we ensure that these EoSs are valid for applications to HICs by enforcing conditions of strangeness neutrality and fixed charge-to-baryonnumber ratio. 

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5. QCD critical point, Lee-Yang edge singularities, and Padé resummations

   https://doi.org/10.1103/PhysRevC.110.015203  

   Başar, Gökçe (July 2024, Physical Review C)

   I analyze the trajectory of the Lee-Yang edge singularities of the QCD equation of state in the complex baryon chemical potential ( ${\mu }_B$) plane for different values of the temperature by using the recent lattice results for the Taylor expansion coefficients up to eighth order in ${\mu }_B$and various resummation techniques that blend in Padé expansions and conformal maps. By extrapolating from this information, I estimate for the location of the QCD critical point: $T_c\approx 100$MeV, ${\mu }_c\approx 580$MeV. I also estimate the crossover slope at the critical point to be ${\alpha }_1\approx 9^{\circ }$and further constrain the nonuniversal mapping parameters between the three-dimensional Ising model and QCD equations of state. Published by the American Physical Society2024 

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