Hypernuclear matter in strong magnetic field

Sinha, Monika and Mukhopadhyay, Banibrata and Sedrakian, Armen (2013) Hypernuclear matter in strong magnetic field. In: NUCLEAR PHYSICS A, 898 . pp. 43-58.

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Abstract

Compact stars with strong magnetic fields (magnetars) have been observationally determined to have surface magnetic fields of order of 10(14)-10(15) G, the implied internal field strength being several orders larger. We study the equation of state and composition of dense hypernuclear matter in strong magnetic fields in a range expected in the interiors of magnetars. Within the non-linear Boguta-Bodmer-Walecka model we find that the magnetic field has sizable influence on the properties of matter for central magnetic field B >= 10(17) G, in particular the matter properties become anisotropic. Moreover, for the central fields B >= 10(18) G, the magnetized hypernuclear matter shows instability, which is signalled by the negative sign of the derivative of the pressure parallel to the field with respect to the density, and leads to vanishing parallel pressure at the critical value B-cr congruent to 10(19) G. This limits the range of admissible homogeneously distributed fields in magnetars to fields below the critical value B-cr. (c) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	NUCLEAR PHYSICS A
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE BV, NETHERLANDS.
Keywords:	Neutron stars; Nuclear matter; Strong magnetic fields
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Apr 2013 09:02
Last Modified:	08 Apr 2013 09:02
URI:	http://eprints.iisc.ac.in/id/eprint/46326

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