Low-cost fermions in classical field simulations (2008)
We discuss the possible extension of the bosonic classical field theory simulations to include fermions. This problem has been addressed in terms of the inhomogeneous mean field approximation by...
Progress in nonequilibrium quantum field theory III (2006)
We review recent developments and open questions for the description of nonequilibrium quantum fields, continuing hep-ph/0302210 and hep-ph/0410330.
Lattice simulations of real-time quantum fields (2006)
Berges, J., Borsanyi, Sz., Sexty, D.
We investigate lattice simulations of scalar and nonabelian gauge fields in Minkowski space-time. For SU(2) gauge-theory expectation values of link variables in 3+1 dimensions are constructed by a...
Nonequilibrium quantum fields from first principles (2005)
Calculations of nonequilibrium processes become increasingly feasable in quantum field theory from first principles. There has been important progress in our analytical understanding based on 2PI...
Isotropization far from equilibrium (2005)
Berges, J., Borsanyi, Sz., Wetterich, C.
Isotropization occurs on time scales much shorter than the thermal equilibration time. This is a crucial ingredient for the understanding of collision experiments of heavy nuclei or other...
Renormalized thermodynamics from the 2PI effective action (2004)
Berges, J., Borsanyi, Sz., Reinosa, U., Serreau, J.
High-temperature resummed perturbation theory is plagued by poor convergence properties. The problem appears for theories with bosonic field content such as QCD, QED or scalar theories. We calculate...
Non-equilibrium Goldstone phenomenon in tachyonic preheating (2003)
Borsanyi, Sz., Patkos, A., Sexty, D.
The dominance of the direct production of elementary Goldstone waves is demonstrated in tachyonic preheating by numerically determining the evolution of the dispersion relation, the equation of state...
Nonequilibrium Goldstone phenomenon in Hybrid Inflation (2003)
Borsanyi, Sz., Patkos, A., Sexty, D.
We study the onset of Goldstone phenomenon in a hybrid inflation scenario. The physically motivated range of parameters is analyzed in order to meet the cosmological constraints. Classical equations...
Thermalization of fermionic quantum fields (2002)
Berges, J., Borsanyi, Sz., Serreau, J.
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 systematic...
Goldstone excitations from spinodal instability (2002)
Borsanyi, Sz., Patkos, A., Sexty, D.
The squared mass of a complex scalar field is turned dynamically into negative by its O(2)-invariant coupling to a real field slowly rolling down in a quadratic potential. The emergence of gapless...
Ising-like dynamical signatures and the end-point of the QCD transition line (2001)
Borsanyi, Sz., Patkos, A., Sexty, D., Szep, Zs.
An increase in the size of coherent domains in the one component $\Phi^4$ field theory under the influence of a uniformly changing external magnetic field near the critical end-point $T_{\Phi}=T_c,...
Relaxation of 2+1 dimensional classical O(2) symmetric scalar fields (2000)
Real time thermalization and relaxation phenomena are studied in the low energy density phase of the 2+1 dimensional classical O(2) symmetric scalar theory by solving numerically its dynamics. The...
Fate of the classical false vacuum (2000)
Borsanyi, Sz., Patkos, A., Polonyi, J., Szep, Zs.
Thermalisation of configurations with initial white noise power spectrum is studied in numerical simulations of a classical one-component $\Phi^4$ theory in 2+1 dimensions, coupled to a small...
Dynamical Manifestation of the Goldstone Phenomenon at 1-loop (1999)
Borsanyi, Sz., Patkos, A., Szep, Zs.
We have calculated the damping rate $\Gamma (|{\bf k}|)$ for classical on-shell Goldstone modes of the O(2) symmetric scalar fields propagating in a thermal medium of the broken symmetry phase taking...