Valencia from 20 to 22 March 2013
3rd Iberian Gravitational-Wave Meeting 2013


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General programme, activity sheet

Friday 22 March, 2013 15:30 to 16:00 Conference
On the magnetorotational instability in hypermassive neutron stars
Speaker: Daniel Siegel, Max Planck Institute for Gravitational Physics

Authors: Daniel Siegel, Riccardo Ciolfi, Abraham Harte, Luciano Rezzolla


Differentially rotating hypermassive neutron stars (HMNSs) are metastable objects which can be formed in the merger of neutron-star binaries. The eventual collapse of a HMNS into a black hole is a key element in generating the physical conditions that are expected to accompany the launch of a short gamma-ray burst. We investigate the influence of magnetic fields on HMNSs by performing global three-dimensional simulations in general-relativistic magnetohydrodynamics (MHD). In particular, we provide direct evidence for the occurrence of the magnetorotational instability (MRI) in HMNS interiors. For the first time in simulations of these systems, rapidly-growing and spatially-periodic structures are observed to form, with features like those of the channel flows produced by the MRI in other systems. Moreover, the growth time and wavelength of the fastest-growing mode can be extracted and compared successfully with analytical predictions. The MRI emerges as an important mechanism to amplify magnetic fields over the lifetime of the HMNS, whose collapse is found to be accelerated by MHD effects. The evidence provided here that the MRI can actually occur in HMNSs could have a profound impact on the outcome of neutron-star binary mergers and their connection to short gamma-ray bursts.
Afternoon Sessions
Place: Salon Grados

Other activities in Afternoon Sessions
18:00 h. to 18:30 h.Conference

New results for electromagnetic quasinormal modes of black holes

Speaker: Denitsa Staicova, Sofia University
17:30 h. to 18:00 h.Conference

Canonical dynamics of variational discrete systems

Speaker: Philipp  Hoehn, Perimeter Institute for Theoretical Physics
16:30 h. to 17:00 h.Conference

Trumpet puncture initial data for black holes on COCAL

Speaker: Takumu Kawamura, University of the Ryukyus, graduate student
17:00 h. to 17:30 h.Coffee break

16:00 h. to 16:30 h.Conference

General Relativistic Resistive Magnetohydrodynamics with Whisky

Speaker: Daniela Alic, Max Planck Institute for Gravitational Physics - Albert Einstein Institute, Postdoc
15:00 h. to 15:30 h.Conference

Gravitational Wave Emission from Magnetized Neutron Stars

Speaker: Riccardo Ciolfi, AEI Potsdam


Organizers, sponsors, collaborators

    

ADEIT Fundació Universitat Empresa

Plaza Virgen de la Paz, 3 · E-46001 Valencia
Phone: +34 963 262 600 · Fax: +34 963 262 700