Th. v. Jürgensen †

arXiv : hep - th / 9303083 v 1 15 Mar 1993 æ

We discuss the Dirac quantization of two dimensional gravity with bosonic matter fields. After defining the extended Hamiltonian it is possible to fix the gauge completely. The commutators can all be obtained in closed form; nevertheless, the results are not particularly simple. Universidade de São Paulo IFUSP-preprint-1041 March 1993 ∗ Present Address: Instituto de F́ısica, Universidade Federal...

arXiv : hep - th / 9508086 v 2 16 Oct 1995

We review the definition of the Casimir energy steming naturally from the concept of functional determinant through the zeta function prescription. This is done by considering the theory at finite temperature and by defining then the Casimir energy as its energy in the limit T → 0. The ambiguity in the coefficient Cd/2 is understood to be a result of the necessary renormalization of the free en...

arXiv : nucl - th / 0212064 v 3 8 Jun 2004 1

arXiv : nucl - th / 9910012 v 3 8 Dec 1999

A unitary multi-channel approach, first developed by the Carnegie-Mellon-Berkeley group, is applied to extract the pole positions, masses, and partial decay widths of nucleon resonances from the partial wave amplitudes for the transitions from πN to eight possible final baryon-meson states. Results of single energy analyses of the VPI group using the most current database are used in this analy...

arXiv : hep - th / 9707083 v 1 9 Jul 1997

The vacuum energies corresponding to massive Dirac fields with the boundary conditions of the MIT bag model are obtained. The calculations are done with the fields occupying the regions inside and outside the bag, separately. The renormalization procedure for each of the situations is studied in detail, in particular the differences occurring with respect to the case when the field extends over...