2004/03/05 by J. A. Miralles, J. A. Pons, V. Urpin · 3 citations
Physics and Astronomy · #Astro and Planetary Science #Pulsars and Gravitational Waves Research #Quantum, superfluid, helium dynamics #astro-ph
paper · pdf · doi:10.1051/0004-6361:20035924
published as Astron.Astrophys. 420 (2004) 245-249 · 5 pages, 4 figures, final version to appear in A&A
arxiv created 2004/03/05 · openalex publication_date 2004/05/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the conditions for convective instability in rotating, non-magnetic proto-neutron stars. The criteria that determine stability of nascent neutron stars are analogous to the Solberg-Høiland conditions but including the presence of lepton gradients. Our results show that, for standard angular velocity profiles, convectively unstable modes with wave-vectors parallel to the rotation axis are suppressed by a stable angular momentum profile, while unstable modes with wave-vectors perpendicular to the axis remain unaltered. Since the wave-vector is perpendicular to the velocity perturbation, the directional selection of the unstable modes may result in fluid motions along the direction of the rotation axis. This occurs in rigidly rotating stars as well as in the inner core of differentially rotating stars. Our results provide a natural source of asymmetry for proto-neutron stars with the only requirement that angular velocities be of the order of the convective characteristic frequency.