[seminar] SEMINAR: Wednesday 26.02 at 11:00, IRB, seminar ZTF-a

[Oleg Antipin]

SEMINAR
Wednesday 26.02 at 11:00, IRB, seminar ZTF-a

Mjesto: IRB, predavaona I krila

Speaker:
Ivan Dadić

Title:
Collision Integrals and Damping Rates
from Finite-Time-Path Out-of-Equilibrium FT

Abstract:
Braaten and Pisarski have calculated damping rates (D) for heavy ion  
collisions. They found gauge independent result D ~ g^2 T for quark  
and gluon damping rates. Within the Finite-Time-Path  
Out-of-Equilibrium Field Theory, we calculate collision integral and  
damping rates from Dyson-Schwinger equation for far from equilibrium  
media. The contributions to retarded self-energy split to “statical"  
(without minimal time vertices) part plus “dynamical" (with one or  
more minimal time vertices) part. Statical part contains (in the case  
of QCD) all hard thermal loop contributions together with higher order  
contributions (so called Braaten-Pisarski calculus near equilibrium)  
and multiplies algebraically. It is easilly resummed. This way one  
obtains
improved collision integral and damping rate. For resummed propagators we find
good agreement with Braaten and Pisarski resummation of hard thermal loops at
equilibrium
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