arXiv subjects

O. Bohr

Publications and source records attributed to O. Bohr.

5 recordsLinked to original sources

arXiv2002

Finite-Temperature Gluon Condensate with Renormalization Group Flow Equations

Within a self-consistent proper-time Renormalization Group (RG) approach we investigate an effective QCD trace anomaly realization with dilatons and determine the finite-temperature behavior of the gluon condensate. Fixing the effective model at vanishing temperature to the glueball mass and the bag constant a possible gluonic phase transition is explored in detail. Within the RG framework the full non-truncated dilaton potential analysis is compared with a truncated potential version.

hep-th↗

arXiv2000

Renormalization Group Flow Equations For The Scalar O(N) Theory

Self-consistent new renormalization group flow equations for an O(N)-symmetric scalar theory are approximated in next-to-leading order of the derivative expansion. The Wilson-Fisher fixed point in three dimensions is analyzed in detail and various critical exponents are calculated.

hep-ph↗

arXiv2000

Renormalization Group Flow Equations and the Phase Transition in O(N)-models

We derive and solve flow equations for a general O(N)-symmetric effective potential including wavefunction renormalization corrections combined with a heat-kernel regularization. We investigate the model at finite temperature and study the nature of the phase transition in detail. Beta functions, fixed points and critical exponents β, ν, δand ηfor various N are independently calculated which allow for a verification of universal scaling relations.

hep-ph↗

arXiv1999

Flow Equations and the Chiral Phase Transition

Flow equations for an O(N)-symmetric effective potential are discussed and solved for the finite temperature case. The model is investigated at the critical point and critical exponents for various N are calculated.

hep-ph↗

arXiv1999

The Octet of Goldstone-Bosons in the SU(3) Linear sigma Model in the QRPA

A symmetry conserving, non-perturbative treatment based on a variational squeezed vacuum state in conjunction with a well-defined class of RPA fluctuations is applied to the SU(3) linear-sigma-model. It is shown that the Goldstone theorem holds exactly both at zero and finite temperature. The approach represents a systematic procedure which avoids problems of the Gaussian Functional with the symmetries.

hep-ph↗