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Renormalization group methods can be applied to the nuclear many-body problem using the approach proposed by Shankar. We start with the two-body low momentum interaction Vlow k and use the RG flow from the particle-hole channels to calculate the full scattering amplitude in the vicinity of the Fermi surface. This is a new straightforward approach to the(More)
We construct a relativistic and unitary approach to ’high’ energy pionand photonnucleon reactions taking the πN, π∆, ρN , ωN , ηN,KΛ,KΣ final states into account. Our scheme dynamically generates the sand d-wave nucleon resonances N(1535), N(1650) and N(1520) and isobar resonances ∆(1620) and ∆(1700) in terms of quasi-local interaction vertices. The(More)
Many interactive computer applications can with advantage be built after the menu principle. MGEN is a program that automatically builds a skeleton of a menu driven program. It is a well known problem that users of programs normally cannot state what they really want until they see the finished program running. With MGEN, the resulting program can be(More)
Considering an extension of the Nambu-Jona-Lasinio model to the interaction of fermions with an effective gluon field we study the relation between deconfinement and the chiral phase transitions. The conservation of the baryon number and isospin symmetry is assumed in the model and the calculations are performed within the mean field approximation. We put(More)
We calculate the modification of the effective interaction of particles on the Fermi surface due to polarization contributions, with particular attention to spin-dependent forces. In addition to the standard spin-spin, tensor, and spin-orbit forces, spin nonconserving effective interactions are induced by screening in the particle-hole channels.(More)
We compute the modification of the quark condensate 〈q̄q〉 in relativistic nucleusnucleus collisions and estimate the 4-volume, where the quark condensate is small (〈q̄q〉/〈q̄q〉0 ≤ 0.1–0.3) using hadron phase-space distributions obtained with the quark-gluon string model. As a function of the beam energy the 4-volume rises sharply at a beam energy Elab/A ≃(More)
We study the p-wave polarization operator of the ρ-meson due to ρN interactions via the N (1720) and ∆(1905) resonances and compute the corresponding production rate for e+e−-pairs at finite temperature and baryon density. At high baryon density we find a significant shift of the spectrum to lower invariant masses.