Blog

  • Modern nuclear and astrophysical constraints of dense matter in a redefined chiral approach

    Modern nuclear and astrophysical constraints of dense matter in a redefined chiral approach

    Published on April 01, 2024

    Title

    Modern nuclear and astrophysical constraints of dense matter in a redefined chiral approach

    Authors

    Rajesh Kumar, Yuhan Wang, Nikolas Cruz Camacho, Arvind Kumar, Jacquelyn Noronha-Hostler, Veronica Dexheimer

    Abstract

    We explore the quantum chromodynamics (QCD) phase diagram’s complexities, including quark deconfinement transitions, liquid-gas phase changes, and critical points by using the chiral mean-field (CMF) model that is able to capture all these features. We introduce a vector meson field redefinition within the CMF framework, enabling precise adjustments of meson masses and coupling strengths related to vector meson interactions. Performing a new fit to the deconfinement potential, we are able to replicate recent lattice QCD results, low-energy nuclear physics properties, neutron star observational data, and key phase diagram features as per modern constraints. This approach enhances our understanding of vector mesons’ roles in mediating nuclear interactions and their impact on the equation of state, contributing to a more comprehensive understanding of the QCD phase diagram and its implications for nuclear and astrophysical phenomena.

    BibTeX

    @article{Kumar:2024owe, author = "Kumar, Rajesh and Wang, Yuhan and Camacho, Nikolas Cruz and Kumar, Arvind and Noronha-Hostler, Jacquelyn and Dexheimer, Veronica",
title = "{Modern nuclear and astrophysical constraints of dense matter in a redefined chiral approach}",
eprint = "2401.12944", 
archivePrefix = "arXiv",
primaryClass = "nucl-th",
doi = "10.1103/PhysRevD.109.074008",
journal = "Phys. Rev. D", 
volume = "109", 
number = "7",
pages = "074008", 
year = "2024" }

  • Hot QCD phase diagram from holographic Einstein–Maxwell–Dilaton models

    Published on November 30, 2023

    Title

    Hot QCD phase diagram from holographic Einstein–Maxwell–Dilaton models

    Authors

    Romulo Rougemont, Joaquin Grefa, Mauricio Hippert, Jorge Noronha, Jacquelyn Noronha-Hostler, Israel Portillo, Claudia Ratti

    Abstract

    In this review, we provide an up-to-date account of quantitative bottom-up holographic descriptions of the strongly coupled quark–gluon plasma (QGP) produced in relativistic heavy-ion collisions, based on the class of gauge-gravity Einstein–Maxwell–Dilaton (EMD) effective models. The holographic approach is employed to tentatively map the QCD phase diagram at finite temperature onto a dual theory of charged, asymptotically Anti-de Sitter (AdS) black holes living in five dimensions. With a quantitative focus on the hot QCD phase diagram, the nonconformal holographic EMD models reviewed here are adjusted to describe first-principles lattice results for the finite-temperature QCD equation of state, with 2+1 flavors and physical quark masses, at zero chemical potential and vanishing electromagnetic fields. We review the evolution of such effective models and the corresponding improvements produced in quantitative holographic descriptions of the deconfined hot QGP phase of QCD. The predictive power of holographic EMD models is tested by quantitatively comparing their predictions for the hot QCD equation of state at nonzero baryon density and the corresponding state-of-the-art lattice QCD results. Hydrodynamic transport coefficients such as the shear and bulk viscosities predicted by these EMD constructions are also compared to the corresponding profiles favored by the latest phenomenological multistage models simultaneously describing different types of heavy-ion data. We briefly report preliminary results from a Bayesian analysis using EMD models, which provide systematic evidence that lattice QCD results at finite temperature and zero baryon density strongly constrains the free parameters of such bottom-up holographic constructions. Remarkably, the set of parameters constrained by lattice results at vanishing chemical potential turns out to produce EMD models in quantitative agreement with lattice QCD results also at finite baryon density. We also review results for equilibrium and transport properties from magnetic EMD models, which effectively describe the hot and magnetized QGP at finite temperatures and magnetic fields with zero chemical potentials. Finally, we provide a critical assessment of the main limitations and drawbacks of the holographic models reviewed in the present work, and point out some perspectives we believe are of fundamental importance for future developments.

    BibTeX

    @article{Rougemont:2023gfz,
    author = "Rougemont, Romulo and Grefa, Joaquin and Hippert, Mauricio and Noronha, Jorge and Noronha-Hostler, Jacquelyn and Portillo, Israel and Ratti, Claudia",
    title = "{Hot QCD phase diagram from holographic Einstein\textendash{}Maxwell\textendash{}Dilaton models}",
    eprint = "2307.03885",
    archivePrefix = "arXiv",
    primaryClass = "nucl-th",
    doi = "10.1016/j.ppnp.2023.104093",
    journal = "Prog. Part. Nucl. Phys.",
    volume = "135",
    pages = "104093",
    year = "2024"
}

  • Bayesian location of the QCD critical point from a holographic perspective

    Bayesian location of the QCD critical point from a holographic perspective

    Submitted to ArXiV on September 1, 2023

    Title

    Bayesian location of the QCD critical point from a holographic perspective

    Authors

    Mauricio Hippert, Joaquin Grefa, T. Andrew Manning, Jorge Noronha, Jacquelyn Noronha-Hostler, Israel Portillo Vazquez, Claudia Ratti, Romulo Rougemont, Michael Trujillo

    Abstract

    A fundamental question in QCD is the existence of a phase transition at large doping of quarks over antiquarks. We present the first prediction of a QCD critical point (CP) from a Bayesian analysis constrained by first principle results at zero doping. We employ the gauge/gravity duality to map QCD onto a theory of dual black holes. Predictions for the CP location in different realizations of the model overlap at one sigma. Even if many prior samples do not include a CP, one is found in nearly 100% of posterior samples, indicating a strong preference for a CP.

    BibTeX

    @article{Hippert:2023bel,
    author = "Hippert, Mauricio and Grefa, Joaquin and Manning, T. Andrew and Noronha, Jorge and Noronha-Hostler, Jacquelyn and Portillo Vazquez, Israel and Ratti, Claudia and Rougemont, Romulo and Trujillo, Michael",
    title = "{Bayesian location of the QCD critical point from a holographic perspective}",
    eprint = "2309.00579",
    archivePrefix = "arXiv",
    primaryClass = "nucl-th",
    month = "9",
    year = "2023"
}

  • Finite density QCD equation of state: critical point and lattice-based T′-expansion

    Finite density QCD equation of state: critical point and lattice-based T′-expansion

    Submitted to ArXiV on February 13, 2024

    Title

    Finite density QCD equation of state: critical point and lattice-based T′-expansion

    Authors

    Micheal Kahangirwe, Steffen A. Bass, Elena Bratkovskaya, Johannes Jahan, Pierre Moreau, Paolo Parotto, Damien Price, Claudia Ratti, Olga Soloveva, Mikhail Stephanov

    Abstract

    We present a novel construction of the QCD equation of state (EoS) at finite baryon density. Our work combines a recently proposed resummation scheme for lattice QCD results with the universal critical behavior at the QCD critical point. This allows us to obtain a family of equations of state in the range 0≤μB≤700 MeV and 25≤T≤800 MeV, which match lattice QCD results near μB=0 while featuring a critical point in the 3D Ising model universality class. The position of the critical point can be chosen within the range accessible to beam-energy scan heavy-ion collision experiments. The strength of the singularity and the shape of the critical region are parameterized using a standard parameter set. We impose stability and causality constraints and discuss the available ranges of critical point parameter choices, finding that they extend beyond earlier parametric QCD EoS proposals. We present thermodynamic observables, including baryon density, pressure, entropy density, energy density, baryon susceptibility and speed of sound, that cover a wide range in the QCD phase diagram relevant for experimental exploration.

    BibTeX

    @article{Kahangirwe:2024cny,
    author = "Kahangirwe, Micheal and Bass, Steffen A. and Bratkovskaya, Elena and Jahan, Johannes and Moreau, Pierre and Parotto, Paolo and Price, Damien and Ratti, Claudia and Soloveva, Olga and Stephanov, Mikhail",
    title = "{Finite density QCD equation of state: critical point and lattice-based $T'$-expansion}",
    eprint = "2402.08636",
    archivePrefix = "arXiv",
    primaryClass = "nucl-th",
    month = "2",
    year = "2024"
}

  • MUSES community forum is online

    The MUSES community will grow to include more than just the core collaboration team members. Over time, the open source ecosystem supporting the MUSES project will include contributers and members of the general public. Open source communities need a public forum to enable their effective cooperation and collaborative approaches to continued MUSES development.

    To this end, we have deployed a public forum at https://forum.muses.ncsa.illinois.edu/, powered by the popular Discourse platform that has been in use by many open source communities for years.