Speaker: Giuliano Giacalone (Université Paris-Saclay)

Title of Talk: Primordial fluctuations and anisotropy in heavy-ion collisions

Abstract: Unraveling the origin of energy-density fluctuations in heavy-ion collisions is central to our understanding of the great wealth of current and future experimental data coming from particle colliders. I present a field-theoretical description of the fluctuations and the anisotropy of energy density created in nucleus-nucleus collisions. Taking as sole inputs the correlation functions of the energy-density field, this description allows one to evaluate the spatial anisotropy of the system, that can be then compared to high-precision experimental data on elliptic and triangular flow. I perform an application of this approach by taking the 1-point and 2-point function of the energy density of nucleus-nucleus collisions recently derived within the color glass condensate framework of high-energy QCD. Doing so, I obtain a first-principles description of the primordial anisotropy of heavy-ion systems, which I test against experimental data from RHIC and LHC. I discuss the potentially far-reaching implications of these results for the current paradigm of fluctuations in heavy-ion collisions. Based on: – Gelis, Giacalone, Guerrero-Rodriguez, Marquet, Ollitrault, “Primordial fluctuations in heavy-ion collisions”, arXiv:1905.XXXXX – Bhalerao, Giacalone, Ollitrault, “Primordial non-Gaussianity in heavy-ion collisions”, arXiv:1904.10350 – Bhalerao, Giacalone, Guerrero-Rodriguez, Luzum, Marquet, Ollitrault, “Relating eccentricity fluctuations to density fluctuations in heavy-ion collisions”, arXiv:1903.06366 – Giacalone, Guerrero-Rodriguez, Luzum, Marquet, Ollitrault, “New paradigm for fluctuations in heavy-ion collisions” arXiv:1902.07168