[SEMINARI] Magneto-Rotational-Instability in Magnetized Hypermassive Neutron Stars, Riccardo Ciolfi

[Enric Marco]

Title: Magneto-Rotational-Instability in Magnetized Hypermassive Neutron 
Stars

by: Riccardo Ciolfi

from: Albert Einstein Institute, Potsdam, Alemanya

Where: Seminari del departament d'Astronomia i Astrofísica

Date: Dimarts 05 febrer 2013

At: 15:00

Resum

Differentially rotating hypermassive neutron stars (HMNSs) are 
metastable configurations which can be formed in the latest stage of 
binary neutron star mergers. Their eventual collapse produces a spinning 
black hole surrounded by a hot and thick accretion disk. The dynamics of 
such a system is of crucial importance, since it could generate the 
relativistic jets observed in short gamma-ray bursts. By performing 
simulations of very high resolution, we study the influence of magnetic 
fields on the evolution of HMNSs. In particular, we provide convincing 
evidence for the occurrence of the magneto-rotational instability (MRI), 
potentially responsible for strong magnetic field amplification and 
angular momentum redistribution. Characteristic features of the MRI are 
discussed and quantities such as the characteristic growth rate and the 
wavelength of the fastest growing mode are extracted and compared with 
analytical predictions.

-- 
/------------------------------------\
Dr. Enric Marco
Departament d'Astronomia i Astrofísica
Facultat de Física
Universitat de València
C/  Dr. Moliner, 50
46100 Burjassot, Spain
Phone: (34)-96-354-3069
Fax:(34)-96-354-3084
enric.marco en uv.es
www.uv.es/marco
\--------------------------------------/