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9 papers · 2 filters
The scalar-isoscalar spectral function of strong matter in a large N approximation
A. Patkos, Zs. Szep, P. Szepfalusy
The enhancement of the scalar-isoscalar spectral function near the two-pion threshold is studied in the framework of an effective linear model, using a large N approximation in…
Thermalization of fermionic quantum fields
J. Berges, Sz. Borsanyi, J. Serreau
We solve the nonequilibrium dynamics of a 3+1 dimensional theory with Dirac fermions coupled to scalars via a chirally invariant Yukawa interaction. The results are obtained from a…
Z-Burst Scenario for the Highest Energy Cosmic Rays
Z. Fodor, S. D. Katz, A. Ringwald
The origin of highest energy cosmic rays is yet unknown. An appealing possibility is the so-called Z-burst scenario, in which a large fraction of these cosmic rays are decay produc…
Generalized Boltzmann equations for on-shell particle production in a hot plasma
A. Jakovac
A novel refinement of the conventional treatment of Kadanoff--Baym equations is suggested. Besides the Boltzmann equation another differential equation is used for calculating the…
Finite temperature spectral function of the meson from large N expansion
A. Patkos, Zs. Szep, P. Szepfalusy
The spectral function of the scalar-isoscalar channel of the O(N) symmetric linear model is studied in the broken symmetry phase. The investigation is based on the leading orde…
Second sheet pole and the threshold enhancement of the spectral function in the scalar-isoscalar meson-sector
A. Patkos, Zs. Szep, P. Szepfalusy
The scalar-isoscalar propagator of the effective linear model of meson dynamics is investigated with the help of an expansion in the number of the Goldstone bosons. A generic s…