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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.

Date: 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.

Date: 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.

Date: 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…

Date: Sep 04, 2023
Title: Thermodynamics of an updated hadronic resonance list and influence on hadronic transport
Authors: Jordi Salinas San Martín, Renan Hirayama, Jan Hammelmann, Jamie M. Karthein, Paolo Parotto, Jacquelyn Noronha-Hostler, Claudia Ratti, Hannah Elfner
Abstract: Hadron lists based on experimental studies summarized by the Particle Data Group (PDG) are a crucial input for the equation of state and thermal models used in the study of strongly-interacting matter produced in heavy-ion collisions. Modeling of these strongly-interacting systems is carried out via hydrodynamical simulations, which are followed by hadronic transport codes that also require a hadronic list as input. To remain consistent throughout the different stages of modeling of a heavy-ion collision, the same hadron list with its corresponding decays must be used at each step. It has been shown that even the most uncertain states listed in the PDG from 2016 are required to reproduce partial pressures and susceptibilities from Lattice Quantum Chromodynamics with the hadronic list known as the PDG2016+. Here, we update the hadronic list for use in heavy-ion collision modeling by including the latest experimental information for all states listed in the Particle Data Booklet in 2021. We then compare our new list, called PDG2021+, to Lattice Quantum Chromodynamics results and find that it achieves even better agreement with the first principles calculations than the PDG2016+ list. Furthermore, we develop a novel scheme based on intermediate decay channels that allows for only binary decays, such that PDG2021+ will be compatible with the hadronic transport framework SMASH. Finally, we use these results to make comparisons to experimental data and discuss the impact on particle yields and spectra.

Published on June 05, 2024

Title

Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter

Authors

Rajesh Kumar, Veronica Dexheimer, Johannes Jahan, Jorge Noronha, Jacquelyn Noronha-Hostler, Claudia Ratti, Nico Yunes, Angel Rodrigo Nava Acuna, Mark Alford, Mahmudul Hasan Anik, Debarati Chatterjee, Katerina Chatziioannou, Hsin-Yu Chen, Alexander Clevinger, Carlos Conde, Nikolas Cruz-Camacho, Travis Dore, Christian Drischler, Hannah Elfner, Reed Essick, David Friedenberg, Suprovo Ghosh, Joaquin Grefa, Roland Haas, Alexander Haber, Jan Hammelmann, Steven Harris, Carl-Johan Haster, Tetsuo Hatsuda, Mauricio Hippert, Renan Hirayama, Jeremy W. Holt, Micheal Kahangirwe, Jamie Karthein, Toru Kojo, Philippe Landry, Zidu Lin, Matthew Luzum, Timothy Andrew Manning, Jordi Salinas San Martin, Cole Miller, Elias Roland Most, Debora Mroczek, Azwinndini Muronga, Nicolas Patino, Jeffrey Peterson, Christopher Plumberg, Damien Price, Constanca Providencia, Romulo Rougemont, Satyajit Roy, Hitansh Shah, Stuart Shapiro, Andrew W. Steiner, Michael Strickland, Hung Tan, Hajime Togashi, Israel Portillo Vazquez, Pengsheng Wen, Ziyuan Zhang (MUSES Collaboration)

Abstract
This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice and perturbative QCD, as well as chiral effective field theory results. From the experimental side, it includes heavy-ion collision and low-energy nuclear physics results, as well as observations from neutron stars and their mergers. The validity of different constraints, concerning specific conditions and ranges of applicability, is also provided

Today Nico Yunes, PI of the NSF-funded MUSES project, announced the second annual MUSES collaboration meeting to be held at the University of Illinois Urbana-Champaign in May. We look forward to another productive and fun in-person meeting!

Date: February 11, 2022
Title: Resummed lattice QCD equation of state at finite baryon density: strangeness neutrality and beyond
Authors: Szabolcs Borsanyi, Zoltan Fodor, Jana N. Guenther, Ruben Kara, Paolo Parotto, Attila Pasztor, Claudia Ratti, Kalman K. Szabo
Abstract: We calculate a resummed equation of state with lattice QCD simulations at imaginary chemical potentials…

We are excited to announce the launch of our own JupyterHub. Jupyter notebooks have become an essential tool for researchers across many fields in science. Scientific simulations, analyses, and calculations of all varieties are becoming increasingly computationally intensive. Our JupyterHub system will embed scientists in the computing resources they need. What is JupyterHub? JupyterHub brings…
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The MUSES project officially begins today. We have hit the ground running, with a suite of services designed to enable the collaboration to do their work efficiently and enjoyably. Conversations are underway to organize source code repositories, begin the work of designing the software architecture for equation of state solver code modules, and establish academic…
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