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Multi-messenger heavy-ion collision physics
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This work studies the production of direct photons in relativistic nuclear collisions, along with the production of hadrons. Radiation from the very first instants to the final moments of the evolution is included. The hybrid model used here describes all stages of relativistic heavy-ion collisions. Chronologically, those are an initial state reflecting the collision of nuclei described within the Color Glass Condensate effective theory; a pre-equilibrium phase based on non-equilibrium linear response; relativistic viscous hydrodynamics, and a hadronic afterburner. The effect of the pre-equilibrium phase on both photonic and hadronic observables is highlighted for the first time. The potential of photon observables -- spectrum, differential elliptic and triangular flow -- to reveal the chemical equilibration time is studied. Finally, we consider "small collision systems", including proton+nucleus collisions and collisions of light nuclei, as probed by hadronic and electromagnetic observables. We demonstrate how photon production can signal the formation of quark-gluon plasma in such small systems.
Forward citations
Cited by 4 Pith papers
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Rotating synchrotron radiation: Photon emission from magnetized and rotating quark-gluon plasma
Rotation enhances synchrotron photon emission from negatively charged quarks in a magnetized QGP, producing a low-transverse-momentum v2 that can reduce the direct photon puzzle tension.
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Photon emission from weakly magnetized neutral pions
In a proton-loop hadronic model, a weak magnetic field suppresses π0→γγ at O(|eB|²/m_P⁴), with a small anisotropy strongest for pion momenta perpendicular to the field.
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A Resummed Hydrodynamic Description of Relativistic Heavy-ion Collisions
A resummed hydrodynamic scheme with tunable caps on shear and bulk viscous stress is introduced; it reduces to standard second-order hydrodynamics for small stresses and is used to quantify flow-observable uncertainti...
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Thermal dilepton production within conformal viscous Gubser flow
Thermal dilepton yields and effective temperatures are computed for conformal viscous Gubser flow, showing larger yields for lower q (larger systems) and higher effective temperatures for smaller systems.
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