arXiv subjects

Wojciech Broniowski

Publications and source records attributed to Wojciech Broniowski.

202 records · Page 12Linked to original sources

arXiv1996

Current algebra and soft pionic modes in asymmetric quark matter

Pionic excitations are analyzed in isospin-asymmetric Fermi gas of constituent quarks. It is found that in addition to the usual pionic excitations, there exists a very low collective mode with quantum numbers of the charged pion (spin-isospin sound). In the chiral limit the excitation energy of one of the modes scales as the current quark mass, and the mode saturates current-algebraic sum rules. This is in agreement with predictions of current algebra for isospin-asymmetric medium.

nucl-th↗

arXiv1996

Melting of the quark condenstate in the NJL model with meson loops

Temperature dependence of the quark condensate is studied in the Nambu--Jona-Lasinio model with meson loops. Substantial differences are found compared to the results with quark loops only.

hep-ph↗

arXiv1994

Pseudo-Goldstone Modes in Isospin-Asymmetric Nuclear Matter

We analyze the chiral limit in dense isospin-asymmetric nuclear matter. It is shown that the pseudo-Goldstone modes in this system are qualitatively different from the case of isospin-symmetric matter.

hep-ph↗

arXiv1992

The role of the Delta isobar in chiral perturbation theory and hedgehog soliton models

Hedgehog model predictions for the leading nonanalytic behavior (in $m^{2}_{π}$) of certain observables are shown to agree with the predictions of chiral perturbation theory up to an overall factor which depends on the operator. This factor can be understood in terms of contributions of the $Δ$ isobar in chiral loops. These physically motivated contributions are analyzed in an expansion in which both $m_π$ and $M_Δ-M_N$ are taken as small parameters, and are shown to yield large corrections to both hedgehog models and chiral perturbation theory.

hep-ph↗