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• W3034698949 abstract "It is expected that a colored matter fulfills the early universe although the colored state cannot beobserved on the present earth. Owing to a development of an accelerator and huge efforts, physicistssucceeded to produce the colored matter on the earth by ultra-relativistic heavy ion collisions. Byinvestigations on several observables, it is found that the produced colored matter seems to be stronglycoupled. The colored matter is called quark-gluon plasma. However, among several observables,photon and dilepton production rates from the colored medium are still evaluated by a perturbativemethod. It is desirable to estimate these rates beyond a perturbation theory and this thesis is devotedto a non-perturbative analysis of photons and dileptons.Thermal radiations of photons and dileptons from the deconfined medium make important rolesin ultra-relativistic heavy ion collisions. Photons and dileptons emitted from the quark-gluon plasmaare direct signals of the deconfined matter and include the information on the medium.In this study, I evaluate production rates of thermal photons and dileptons from quark-gluonplasma with a non-perturbative method. Electromagnetic radiations are proportional to the imagi-nary part of a photon self energy. I analyze the photon self energy with a quark propagator obtainedby a lattice QCD numerical simulation and a gauge invariant vertex. Numerical simulation on the lat-tice QCD is a first-principle calculation, and thus the photon self energy constructed with the latticequark propagator is expected to include non-perturbative effects. Moreover, the obtained self energyrespects the gauge invariance which makes a significantly important role in the quantum field theory.In this study, the lattice quark propagator is composed of two quasi-particle states. Quasi-particlesare particle-like thermal excited states of quarks. On the lattice, one of the quasi-particles calledplasmino has a peculiar nature that its dispersion has the minimum at finite momentum and it existseven in the space-like region. Owing to these characteristics, production rates evaluated with thelattice quark propagator also obtain peculiar structures.I obtained suggestive results of production rates. A photon spectrum shows non-smooth variationsand the almost same slope as perturbative one. The former structure is understood by kinematics ofquasi-particles and I verify that the slope is determined by a thermal factor. A dilepton spectrumshows a characteristic structure called van Hove singularity. This structure is also understood bykinematics of quasi-particles. Surprisingly, obtained spectra of photons and dileptons show compa-rable or slightly smaller rates to perturbative results although production processes are completelydifferent. Finally, I discuss effects of obtained" @default.
• W3034698949 created "2020-06-19" @default.
• W3034698949 creator A5082445662 @default.
• W3034698949 date "2017-03-22" @default.
• W3034698949 modified "2023-09-23" @default.
• W3034698949 title "Non-perturbative analysis on thermal radiations of photons and dileptons from quark-gluon plasma" @default.
• W3034698949 doi "https://doi.org/10.18910/61518" @default.
• W3034698949 hasPublicationYear "2017" @default.
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