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Hannover 2003 – scientific programme

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GR: Gravitation und Relativitätstheorie

GR VII: HV VII

GR VII.1: Invited Talk

Thursday, March 27, 2003, 14:00–15:00, A310

Gravitational waves from neutron stars with large toroidal B-fields — •Curt Cutler — Max-Planck-Institut für Gravitationsphysik, Am Mühlenberg 1, 14476 Golm

We show that neutron stars (NS’s) with large toroidal B-fields tend naturally to evolve into potent gravitational-wave (gw) emitters. The toroidal field Bt tends to distort the NS into a prolate shape, and this magnetic distortion can easily dominate over the oblateness “frozen into” the NS crust. A NS with frozen-in B-field of this magnitude is secularly unstable: the wobble angle between the NS’s angular momentum and the star’s magnetic axis will grow on a dissipation timescale until they are orthogonal. This final orientation is clearly the optimal one for gw emission. We show that for LMXB’s with Bt of order 1013 G, the spindown from gw’s is sufficient to balance the accretion torque–supporting a suggestion by Bildsten. The spindown rates of most millisecond pulsars can also be attributed to gw emission sourced by toroidal B-fields, and both these sources could be observed by LIGO II.

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