I.F.T.
Seminario
(Seminar)
November 21st 2000 Tuesday, 15:00 p.m.
The Nucleon and the Neutron Star
Vikram Soni
(National Physical Laboratory, New Delhi)
At typical central densities of neutron stars (5 - 10
times nuclear density) the nucleon is resolved and therefore
composite. It is then unwise to use purely nucleonic or hadronic
degres of freedom as has been custom. On the other hand, perturbative
QCD applies at much higher density. We use a renormalizable effective
Lagrangian , that is QCD coupled to a chiral multiplet ($\pi$ ,
$\sigma$) which can interpolate between all desities. It yields the
nucleon as a quark soliton and also admits several interesting phases
at high density.
The ground state for the core of a neutron star is found to be a pion
condensate (for 2 flavour matter). This ground state is anisotropic
and lines up the magnetic moments of the constituent quarks to
dynamically yield strong magnetic fields of typical strength of those
found in pulsars.
Where: Modulo C-XVI, 3rd floor,
Facultad de Ciencias U.A.M., C.U. Cantoblanco, 28049-Madrid
For more information about seminars at the I.F.T. e-mail
José Ramón Espinosa
or phone +34-91-397 4418.
Last modified: Mon Nov 20 11:22:28 CET 2000