Effects of bulk viscosity in relativistic heavy ion collisions

Relativistisissa raskasionitörmäyksissä syntyy ainetta, jota kutsutaan kvarkki-gluoniplasmaksi (QGP). QGP on ainetta, joka koostuu heikosti kytketyistä kvarkeista ja gluoneista ja sitä syntyy ainoastaan erittäin korkeissa lämpötiloissa tai paineissa. Kun törmäyksessä syntynyt QGP alkaa jäähtymään, s...

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Main Author: Hirvonen, Henry
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Fysiikan laitos, Department of Physics, Jyväskylän yliopisto, University of Jyväskylä
Format: Master's thesis
Language:eng
Published: 2019
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/66972
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author Hirvonen, Henry
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics Jyväskylän yliopisto University of Jyväskylä
author_facet Hirvonen, Henry Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics Jyväskylän yliopisto University of Jyväskylä Hirvonen, Henry Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics Jyväskylän yliopisto University of Jyväskylä
author_sort Hirvonen, Henry
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description Relativistisissa raskasionitörmäyksissä syntyy ainetta, jota kutsutaan kvarkki-gluoniplasmaksi (QGP). QGP on ainetta, joka koostuu heikosti kytketyistä kvarkeista ja gluoneista ja sitä syntyy ainoastaan erittäin korkeissa lämpötiloissa tai paineissa. Kun törmäyksessä syntynyt QGP alkaa jäähtymään, se kokee faasitransition hadronikaasuksi. QGP:n ja hadronikaasun kehitystä voidaan mallintaa käyttäen relativistista hydrodynamiikkaa, joka on fluidin dynamiikkaa kuvaava efektiivinen teoria. Tämä tutkielma käsittelee erityisesti tilavuusviskositeetin vaikutusta raskasionitörmäyksiin Pb+Pb törmäyksissä, joissa $\sqrt{s_{NN}}$ = 2.76 TeV. Alkutila hydrodynaamiselle kehitykselle saatiin EKRT-mallin avulla ja irtikytkeytyminen toteutettiin Cooper-Frye menetelmällä. Saaduista tuloksista nähtiin, että tilavuusviskositeetti hidasti systeemin laajenemista ja sitä kautta pienesi lopputilan hiukkasten keskimääräisiä poikittaisliikemääriä. In relativistic heavy ion collisions substance called quark-gluon plasma (QGP) is created. The Quark gluon plasma is a matter which consists from a weakly coupled quarks and gluons and it can only be created on extreme temperatures or pressures. After QGP cools down it experiences phase transition to the hadron gas. The evolution of QGP and hadron gas can be modeled using the relativistic hydrodynamics, which is effective theory describing dynamics of the fluids. In this thesis we are particularly interested about effects of the bulk viscosity in Pb+Pb collisions with $\sqrt{s_{NN}}$ = 2.76 TeV. Initial state for hydrodynamic evolution was calculated using the EKRT-model and freeze-out was done using Cooper-Frye procedure. We found out that the bulk viscosity caused expansion of the system to slow down which evidently decreased average transverse momentum of the final state particles.
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spellingShingle Hirvonen, Henry Effects of bulk viscosity in relativistic heavy ion collisions heavy ion collisions QGP hydrodynamics kinetic theory bulk viscosity Teoreettinen fysiikka Theoretical Physics 4024
title Effects of bulk viscosity in relativistic heavy ion collisions
title_full Effects of bulk viscosity in relativistic heavy ion collisions
title_fullStr Effects of bulk viscosity in relativistic heavy ion collisions Effects of bulk viscosity in relativistic heavy ion collisions
title_full_unstemmed Effects of bulk viscosity in relativistic heavy ion collisions Effects of bulk viscosity in relativistic heavy ion collisions
title_short Effects of bulk viscosity in relativistic heavy ion collisions
title_sort effects of bulk viscosity in relativistic heavy ion collisions
title_txtP Effects of bulk viscosity in relativistic heavy ion collisions
topic heavy ion collisions QGP hydrodynamics kinetic theory bulk viscosity Teoreettinen fysiikka Theoretical Physics 4024
topic_facet 4024 QGP Teoreettinen fysiikka Theoretical Physics bulk viscosity heavy ion collisions hydrodynamics kinetic theory
url https://jyx.jyu.fi/handle/123456789/66972 http://www.urn.fi/URN:NBN:fi:jyu-201912195447
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