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Astron. Astrophys. 350, L47-L50 (1999)


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Letter to the Editor

Diquark condensates and the magnetic field of pulsars *

D. Blaschke 1, D.M. Sedrakian 2 and K.M. Shahabasyan 2

1 Universität Rostock, Fachbereich Physik, Universitätsplatz 1, 18051 Rostock, Germany (blaschke@darss.mpg.uni-rostock.de)
2 Yerevan State University, Department of Physics, Alex Manoogian Str. 1, 375025 Yerevan, Armenia

Received 20 May 1999 / Accepted 19 September 1999

Abstract

We study the consequences of superconducting quark cores in neutron stars for the magnetic fields of pulsars. We find that within recent nonperturbative approaches to the effective quark interaction the diquark condensate forms a superconductor of second kind whereas previously quark matter was considered as a first kind superconductor. In both cases the magnetic field which is generated in the surrounding hadronic shell of superfluid neutrons and superconducting protons can penetrate into the quark matter core since it is concentrated in proton vortex clusters where the field strength exceeds the critical value. Therefore the magnetic field will not be expelled from the superconducting quark core with the consequence that there is no decay of the magnetic fields of pulsars. Thus we conclude that the occurence of a superconducting quark matter core in pulsars does not contradict the observational data which indicate that magnetic fields of pulsars have life times larger than [FORMULA] years.

Key words: dense matter – Magnetohydrodynamics (MHD) – stars: interiors – stars: magnetic fields – stars: neutron – stars: pulsars: general

* Research supported in part by the Volkswagen Stiftung under grant no. I/71 226

Send offprint requests to: D. Blaschke

© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999

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