quark–gluon plasma

quark–gluon plasma
Name	quark–gluon plasma
Type	State of matter
Discovered	2000s
Discovered by	Brookhaven National Laboratory; CERN
Phase	Deconfined phase
Constituents	Quarks; Gluons
Temperature	~10^12 K
Density	High energy density

quark–gluon plasma Quark–gluon plasma is a high-temperature, high-density state of matter in which quarks and gluons are deconfined from hadrons. It is studied in contexts ranging from the Relativistic Heavy Ion Collider to the Large Hadron Collider, and connects theoretical frameworks such as Quantum Chromodynamics, Lattice QCD, and Gauge/Gravity duality with experimental programs at institutions like Brookhaven National Laboratory and CERN. Research involves collaborations including ALICE Collaboration, STAR Collaboration, and PHENIX Collaboration and informs understanding related to the Big Bang and compact objects studied at places like Max Planck Institute for Nuclear Physics.

Introduction

The concept of a deconfined phase emerges from Quantum Chromodynamics studies by researchers at institutions including MIT, Princeton University, Harvard University, and CERN groups led by theorists such as Kenneth Wilson, David Gross, Frank Wilczek, David Politzer, and experimentalists affiliated with Lawrence Berkeley National Laboratory and GSI Helmholtz Centre for Heavy Ion Research. Early theoretical predictions were influenced by work at University of Chicago and Yale University and later numerical results from teams at Fermilab and RIKEN. Experimental evidence accumulated through measurements at SPS (CERN), RHIC, and LHC and through international collaborations like European Organization for Nuclear Research and US Department of Energy supported labs.

Properties and Theoretical Description

Theoretical descriptions employ Quantum Chromodynamics as formulated by Murray Gell-Mann and developed at institutions such as California Institute of Technology and Columbia University, leveraging methods from Lattice QCD groups at CERN and Brookhaven National Laboratory. Thermodynamic properties connect to work by Andrei D. Sakharov and techniques from Renormalization Group studies at Stanford University and University of Cambridge. Hydrodynamic modeling uses relativistic viscous formulations associated with researchers at University of Texas at Austin and University of Heidelberg. Strong-coupling approaches utilize AdS/CFT correspondence ideas advanced by Juan Maldacena and collaborators at Institute for Advanced Study. Equation of state results compare predictions from groups at Yukawa Institute for Theoretical Physics and The Niels Bohr Institute. Transport coefficients have been computed by teams at Imperial College London and Trinity College Dublin.

Experimental Creation and Detection

Laboratory creation occurs in colliders like RHIC at Brookhaven National Laboratory and LHC at CERN where heavy ions such as gold and lead nuclei are accelerated by facilities designed by engineers from SLAC National Accelerator Laboratory and DESY. Detector systems such as ALICE, CMS, ATLAS, STAR, and PHENIX were designed by groups at University of California, Berkeley, University of Tennessee, Ohio State University, and University of Birmingham. Data analysis leverages computing grids established by CERN IT and collaborations with European Grid Infrastructure and NERSC. Beam operations coordinate with organizations including International Atomic Energy Agency advisory teams and national labs like Lawrence Livermore National Laboratory. Experimental campaigns reference milestones such as results announced at conferences hosted by American Physical Society, Quark Matter Conference, and European Physical Society.

Signatures and Observables

Key observables include collective flow coefficients measured by collaborations like ALICE Collaboration and STAR Collaboration, jet quenching documented by CMS Collaboration and ATLAS Collaboration, and quarkonium suppression studies originally proposed by theorists at CERN and tested with detectors at RHIC and LHC. Particle yields and spectra analyses involve input from Particle Data Group and experiments from KEK and TRIUMF. Electromagnetic probes are measured with calorimeters developed by teams at Brookhaven National Laboratory and Fermilab. Measurements of strangeness enhancement trace back to proposals from CERN theorists and are tested by experiments supported by agencies such as National Science Foundation and European Research Council. Heavy-flavor suppression and flow observables connect to facilities at RIKEN and GSI.

Formation and Evolution in Heavy-Ion Collisions

The space-time evolution modeling draws on hydrodynamic simulations from groups at McGill University, The Ohio State University, and Duke University. Initial-state physics includes color-glass condensate frameworks developed by theorists at Brookhaven National Laboratory and Columbia University, with input from accelerator physics teams at CERN and SLAC National Accelerator Laboratory. Hadronization and freeze-out processes are compared to statistical hadronization models by researchers at University of Sao Paulo and INFN (Italy). Experimental timelines reference runs from RHIC Beam Energy Scan, LHC Run 1, LHC Run 2, and planned campaigns at FAIR. Collaborations with observatories like LIGO and theoretical groups at Perimeter Institute explore ties to dense-matter phenomena in astrophysical events such as neutron star merger observations led by teams at Caltech and MIT.

Applications and Cosmological Significance

Understanding the quark–gluon plasma informs cosmology of the early Big Bang epoch studied by researchers at CERN and NASA Goddard Space Flight Center and impacts models of compact objects investigated by scientists at Max Planck Institute for Astrophysics and Kavli Institute for Theoretical Physics. Connections to baryogenesis are explored by theorists at Institute for Advanced Study and Perimeter Institute, and implications for neutrino emission are considered by groups at MPIK and Kamioka Observatory. Technological spinoffs have emerged from accelerator developments at SLAC and DESY and detector innovations transferred to medical imaging centers like Mayo Clinic and Johns Hopkins Hospital. Ongoing international efforts involve institutions such as CERN, Brookhaven National Laboratory, GSI, RIKEN, and university consortia across United States, France, Germany, Italy, and Japan.

Category:States of matter