Výsledky vyhledávání - "Jürgen Baacke"

Tunneling in a quantum field theory on a compact one-dimensional space

Publikováno v: Nuclear Physics B. 745:142-164

We compute tunneling in a quantum field theory in 1+1 dimensions for a field potential $U(\Phi)$ of the asymmetric double well type. The system is localized initially in the ``false vacuum''. We consider the case of a {\em compact space} ($S_1$) and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0a155d224c4411e5986f5950588225d
https://doi.org/10.1016/j.nuclphysb.2006.03.031

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Choice of initial states in nonequilibrium dynamics

Autor: Katrin Heitmann, Carsten Pätzold, Jürgen Baacke

Publikováno v: Physical Review D. 57:6398-6405

Imposing initial conditions to nonequilibrium systems at some time t_0 leads, in renormalized quantum field theory, to the appearance of singularities in the variable t-t_0 in relevant physical quantities, such as energy density and pressure. The ori

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https://doi.org/10.1103/physrevd.57.6398

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Fermionic fluctuation corrections to bubble nucleation

Autor: A. Surig, Jürgen Baacke

Publikováno v: Physical Review D. 53:4499-4509

We determine the fermionic corrections to the nucleation rate of bubbles at the electroweak phase transition. The fermion determinant is evaluated exactly and by using the gradient expansion. The gradient expansion is found to be a reliable approxima

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https://doi.org/10.1103/physrevd.53.4499

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One-loop corrections to the instanton transition in the two-dimensional Abelian Higgs model

Autor: T. Daiber, Jürgen Baacke

Publikováno v: Physical Review D. 51:795-801

We present an evaluation of the fluctuation determinant which appears as a prefactor in the instanton transition rate for the two-dimensional Abelian Higgs model. The corrections are found to change the rate at most by a factor of 2 for 0.4 < M_W/M_H

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07710bf6f179161c431c58481edf4ad5
https://doi.org/10.1103/physrevd.51.795

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Erratum: One-loop corrections to the string tension of the vortex in the Abelian Higgs model [Phys. Rev. D78, 085008 (2008)]

Autor: Jürgen Baacke, Nina Kevlishvili

Publikováno v: Physical Review D. 82

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72a5da57304dc3366863b7704d9a3bb0
https://doi.org/10.1103/physrevd.82.129905

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Initial time singularities and admissible initial states for a system of coupled scalar fields

Autor: Jürgen Baacke, Nina Kevlishvili

Publikováno v: Red Report (2009).
Physical review / D 81(2), 023509 (2010). doi:10.1103/PhysRevD.81.023509

We discuss the problem of initial states for a system of coupled scalar fields out of equilibrium in the one-loop approximation. The fields consist of classical background fields, taken constant in space, and quantum fluctuations. If the initial stat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f7faf9cb1566554eda3880bcf05f715
https://doi.org/10.1103/physrevd.81.023509

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Coupled scalar fields in a flat FRW universe: renormalisation

Autor: Nina Kevlishvili, Laura Covi, Jürgen Baacke

Publikováno v: Journal of cosmology and astroparticle physics 2010(08), 026 (2010). doi:10.1088/1475-7516/2010/08/026
Red Report (2010).

We study the non-equilibrium dynamics of a system of coupled scalar fields in a Friedmann-Robertson-Walker (FRW) universe. We consider the evolution of spatially homogeneous "classical" fields and of their quantum fluctuations including the quantum b

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Fluctuations and stability of the 't Hooft-Polyakov monopole

Autor: Jürgen Baacke

Publikováno v: Zeitschrift für Physik C Particles and Fields. 53:399-405

We obtain the equations for the quantum fluctuations of gauge and Higgs fields in the background of a 't Hooft-Polyakov monopole. The integration of these equations at frequency zero provides a check for the stability of the classical solution accord

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2310c6b0317efd0cd36d168182feeed8
https://doi.org/10.1007/bf01625898

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The effective action of a spin 1/2 field in the background of a chiral soliton

Autor: Jürgen Baacke

Publikováno v: Zeitschrift für Physik C Particles and Fields. 53:407-411

We use a recently developed numerical technique in order to evaluate the renormalized effective action of a spin 1/2 field with a chiral mass term, the chiral angle being given by a static hedgehog configuration. The method is based on the use of Euc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::148e317eb4ea63a2faadda39f9fd67a5
https://doi.org/10.1007/bf01625899

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One-loop corrections to the string tension of the vortex in the Abelian Higgs model

Autor: Jürgen Baacke, Nina Kevlishvili

Publikováno v: Physical Review D. 78

We present an exact numerical computation of the one-loop correction of the string tension for the Nielsen-Olesen vortex in the Abelian Higgs model. The computations proceeds via the computation of the Euclidean Green's function for the gauge, Higgs

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https://doi.org/10.1103/physrevd.78.085008

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