Elliptic Flow: A Brief Review

TL;DR

This paper reviews the concept of elliptic flow in ultra-relativistic heavy-ion collisions, discussing its significance in understanding matter under extreme conditions similar to those in the early universe and neutron star cores.

Contribution

It provides a concise overview of elliptic flow measurements and their role in probing the properties of quark-gluon plasma in high-energy nuclear collisions.

Findings

Elliptic flow measurements have advanced with energies from RHIC to LHC.

Elliptic flow helps characterize the early-stage dynamics of heavy-ion collisions.

Current data supports the formation of a strongly interacting quark-gluon plasma.

Abstract

One of the fundamental questions in the field of subatomic physics is what happens to matter at extreme densities and temperatures as may have existed in the first microseconds after the Big Bang and exists, perhaps, in the core of dense neutron stars. The aim of heavy-ion physics is to collide nuclei at very high energies and thereby create such a state of matter in the laboratory. The experimental program started in the 1990's with collisions made available at the Brookhaven Alternating Gradient Synchrotron (AGS), the CERN Super Proton Synchrotron (SPS) and continued at the Brookhaven Relativistic Heavy-Ion Collider (RHIC) with maximum center of mass energies of 4.75, 17.2 and 200 GeV respectively. Collisions of heavy-ions at the unprecedented energy of 2.76 TeV have recently become available at the LHC collider at CERN. In this review I will give a brief introduction to the physics of ultra-relativistic heavy-ion collisions and discuss the current status of elliptic flow measurements.