Evolution of the energy-momentum tensor during the pre-equilibrium phase of a heavy-ion collision

• Grant number: 20/12795-1
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: November 01, 2020
• End date: August 31, 2022
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Jun Takahashi
• Grantee: Antonio Maurício Soares Narciso Ferreira
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 17/05685-2 - Hadronic physics in high energy nuclear collisions, AP.ESP

Abstract

This plan refers to the activities research related to the post-doc program within the Thematic project "Hadronic physics in high energy nuclear collisions" (2017/05685-2). In this project, we plan to improve on the Green's function determination controlling the time evolution of the energy-momentum tensor starting from the Boltzmann equation. To this end, we will relax a simplifying hypothesis, which assumes that the pre-equilibrium phase possesses a conformal symmetry, introducing a mass scale in the Boltzmann equation. This scale will be adjusted in such a way to recover the QCD equation of state, which is implicitly used in the hydrodynamic simulations. The above modification will allow for a smooth transition between the descriptions based on models for the pre-equilibrium and the hydrodynamic phases. Once this Green's function has been determined, we will implement into the pre-equilibrium model, used in a chain of computer codes, describing the three stages of a heavy-ion collision. Our thematic project team has previously developed this code, simulating a heavy-ion collision from its pre-hydrodynamic phase until the "detection" of final states obtained through an event simulator. Therefore, the present proposal should be faced as a natural continuation of ongoing work. In addition to the improvement in the code mentioned above, our efforts will also be dedicated to testing and understanding new physical processes sensitive to the above changes and associated with experimental observables (measurable variables). We also expect to study and verify the validity of observables related to the hydrodynamic evolution in small systems, such as those anticipated for proton+proton, Xenon+Xenon, proton+Lead collisions, and peripheral Lead+Lead collision.

Scientific publications

(8)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

AGUILAR, A. C.; FERREIRA, M. N.; PAPAVASSILIOU, J.. Exploring smoking-gun signals of the Schwinger mechanism in QCD. Physical Review D, v. 105, n. 1, JAN 27 2022. (17/05685-2, 20/12795-1)

ROCHA, GABRIEL S.; FERREIRA, MAURICIO N.; DENICOL, GABRIEL S.; NORONHA, JORGE. Transport coefficients of quasiparticle models within a new relaxation time approximation of the Boltzmann equation. PHYSICAL REVIEW D, v. 106, n. 3, p. 13-pg., 2022-08-23. (17/05685-2, 20/12795-1)

ROCHA, GABRIEL S.; DENICOL, GABRIEL S.; FERREIRA, MAURICIO N.; NORONHA, JORGE. NOVEL RELAXATION TIME APPROXIMATION: A CONSISTENT CALCULATION OF TRANSPORT COEFFICIENTS WITH QCD-INSPIRED RELAXATION TIMES. ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT, v. 16, n. 1, p. 6-pg., 2023-01-01. (20/12795-1, 17/05685-2)

PINTO-GOMEZ, F.; DE SOTO, F.; FERREIRA, M. N.; PAPAVASSILIOU, J.; RODRIGUEZ-QUINTERO, J.. Lattice three-gluon vertex in extended kinematics: Planar degeneracy. Physics Letters B, v. 838, p. 8-pg., 2023-02-08. (20/12795-1, 17/05685-2)

AGUILAR, A. C.; FERREIRA, M. N.; PAPAVASSILIOU, J.. Gluon dynamics from an ordinary differential equation. EUROPEAN PHYSICAL JOURNAL C, v. 81, n. 1, JAN 20 2021. (20/12795-1, 17/05685-2)

AGUILAR, A. C.; AMBROSIO, C. O.; DE SOTO, F.; FERREIRA, M. N.; OLIVEIRA, B. M.; PAPAVASSILIOU, J.; RODRIGUEZ-QUINTERO, J.. Ghost dynamics in the soft gluon limit. Physical Review D, v. 104, n. 5, SEP 24 2021. (17/05685-2, 20/12795-1, 19/05656-8)

AGUILAR, A. C.; DE SOTO, F.; FERREIRA, M. N.; PAPAVASSILIOU, J.; RODRIGUEZ-QUINTERO, J.. Infrared facets of the three-gluon vertex. Physics Letters B, v. 818, JUL 10 2021. (20/12795-1, 17/05685-2)

GIANNINI, A., V; FERREIRA, M. N.; HIPPERT, M.; CHINELLATO, D. D.; DENICOL, G. S.; LUZUM, M.; NORONHA, J.; DA SILVA, T. NUNES; TAKAHASHI, J.. Assessing the ultracentral flow puzzle in hydrodynamic modeling of heavy-ion collisions. PHYSICAL REVIEW C, v. 107, n. 4, p. 7-pg., 2023-04-21. (18/01245-0, 16/24029-6, 21/08465-9, 21/04924-9, 18/24720-6, 20/12795-1, 17/05685-2)