19.11.2021 Quantifying the transport properties of quark-gluon plasma through measurement of higher harmonic flow and their non-linear response (Parkkila)
In this thesis, the measurements of higher harmonic flow and their nonlinear flow responses in Pb-Pb collisions from LHC are presented. These measurements are utilized in a Bayesian analysis with state of the art hydrodynamic model calculations to constrain the QGP properties such as η/s and initial conditions of such collisions.
The extracted η/s of the QGP from this study is shown in the figure and compared to common substances; water and liquid nitrogen and helium. For QGP, the minimum value of η/s is an order of magnitude smaller compared to common substances, close to the universal lower bound 1/4π, lowest in nature (nearly perfect fluid). In addition, the sensitivities of the high harmonic flow observables to various model parameters are quantified for the first time and this analysis confirms that the precision measurements of higher harmonic flow and their correlations are crucial in extracting accurate values of the transport properties.
The dissertation is published in JYU Dissertation series, number 460, Jyväskylä 2021, ISBN 978-951-39-8932-3. Link to the publication:
M.Sc. Jasper Parkkila defends his doctoral dissertation "Quantifying the transport properties of quark-gluon plasma through measurement of higher harmonic flow and their non-linear response" on 19 November 2021 at 12 noon. Opponent Professor William A. Zajc (Columbia University New York, USA) and Custos Senior Researcher DongJo Kim (Ä¢¹½Ö±²¥). The doctoral dissertation is held in English.
The audience can follow the dissertation in the lecture hall or online.
Link to the Zoom Webinar event (Zoom application or Google Chrome web browser recommended):
Phone number to which the audience can present possible additional questions at the end of the event (to the custos): +358 50 313 7868.