Browsing by Author "Chekerke, Merzak"

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    Applications of thermo field dynamics to quark-gluon plasma in equilibrium and non equilibriul and non equilibrium phase state
    (Universite Mouloud MAMMERI Tizi-Ouzou, 2012) Chekerke, Merzak
    The thermo eld dynamics, a real-time formalism for nite temperature quantum eld theory (TFD), is used to calculate the rates for e+e􀀀 reactions at nite temperature and for the pion production. The results indicate that temperature plays an important role in de ning the possible hadronic state after the plasma has cooled down. It is also utilised to de ne the fragmentation function at high energy experiments. The de nition of the fragmentation is extended to nite temperature. The results at T = 0 and T 6= 0 are compared. In general, we nd that the fragmentation function decreases in magnitude. At the end, this formulation of Quantum eld theory (TFD) as well as LvN approach are extended to de ne two-point correlators at nite t and T, and time-dependent Green-functions for open systems. We obtain results for two-point correlators, the Green-functions for scalar eld and 4 eld theory to second order and for Green-functions for fermions.