Carsten Pätzold
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The organizations/institutes from the scholar's latest article
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Carsten Pätzold has a total of 2 co-authors. Here are the top co-authors by number of shared publications:
- Jürgen Baacke
Institut für Physik Universität Dortmund D -44221 Dortmund Germany
2 shared publications - Katrin Heitmann
Institut für Physik Universität Dortmund D -44221 Dortmund Germany
1 shared publication
Latest Publications
- 20 September 2000
- Published by American Physical Society (APS) in Physical Review D
- Vol. 62 (8) , 084008
Renormalization of the nonequilibrium dynamics of fermions in a flat FRW universe
We derive the renormalized equations of motion and the renormalized energy-momentum tensor for fermions coupled to a spatially homogeneous scalar field (inflaton) in a flat FRW geometry. The fermion back reaction to the metric and to the inflaton field is formulated in the one-loop approximation. Having determined the infinite counterterms in a scheme we formulate the finite terms in a form suitable for numerical computation. We comment on the trace anomaly which is inferred from the standard analysis. We also address the problem of initial singularities and determine the Bogoliubov transformation by which they are removed.- 20 September 2000
- Published by American Physical Society (APS) in Physical Review D
- Vol. 62 (8) , 084008
Renormalization of the nonequilibrium dynamics of fermions in a flat FRW universe
We derive the renormalized equations of motion and the renormalized energy-momentum tensor for fermions coupled to a spatially homogeneous scalar field (inflaton) in a flat FRW geometry. The fermion back reaction to the metric and to the inflaton field is formulated in the one-loop approximation. Having determined the infinite counterterms in a scheme we formulate the finite terms in a form suitable for numerical computation. We comment on the trace anomaly which is inferred from the standard analysis. We also address the problem of initial singularities and determine the Bogoliubov transformation by which they are removed.- 15 June 1997
- Published by American Physical Society (APS) in Physical Review D
- Vol. 55 (12) , 7815-7825
Nonequilibrium dynamics: Preheating in the SU(2) Higgs model
The term “preheating” has been introduced recently to denote the process in which energy is transferred from a classical inflaton field into fluctuating field (particle) degrees of freedom without generating yet a real thermal ensemble. The models considered up to now include, in addition to the inflaton field, scalar or fermionic fluctuations. On the other hand, the typical ingredient of an inflationary scenario is a non-Abelian spontaneously broken gauge theory. So the formalism should also be developed to include gauge field fluctuations excited by the inflaton or Higgs field. We have chosen here, as the simplest non-Abelian example, the SU(2) Higgs model. We consider the model at temperature zero. From the technical point of view we generalize an analytical and numerical renormalized formalism developed by us recently to coupled channnel systems. We use the ’t Hooft–Feynman gauge and dimensional regularization. We present some numerical results but reserve a more exhaustive discussion of solutions within the parameter space of two couplings and the initial value of the Higgs field to a future publication.
- 15 June 1997
- Published by American Physical Society (APS) in Physical Review D
- Vol. 55 (12) , 7815-7825
Nonequilibrium dynamics: Preheating in the SU(2) Higgs model
The term “preheating” has been introduced recently to denote the process in which energy is transferred from a classical inflaton field into fluctuating field (particle) degrees of freedom without generating yet a real thermal ensemble. The models considered up to now include, in addition to the inflaton field, scalar or fermionic fluctuations. On the other hand, the typical ingredient of an inflationary scenario is a non-Abelian spontaneously broken gauge theory. So the formalism should also be developed to include gauge field fluctuations excited by the inflaton or Higgs field. We have chosen here, as the simplest non-Abelian example, the SU(2) Higgs model. We consider the model at temperature zero. From the technical point of view we generalize an analytical and numerical renormalized formalism developed by us recently to coupled channnel systems. We use the ’t Hooft–Feynman gauge and dimensional regularization. We present some numerical results but reserve a more exhaustive discussion of solutions within the parameter space of two couplings and the initial value of the Higgs field to a future publication.