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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28063
Title: Papaloizou-Pringle instability suppression by the magnetorotational instability in relativistic accretion discs
Authors: Bugli, M.
Guilet, J.
Müller, E.
Del Zanna, L.
BUCCIANTINI, NICCOLO' 
Montero, P. J.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 475
Issue: 1
First Page: 108
Abstract: Geometrically thick tori with constant specific angular momentum have been widely used in the last decades to construct numerical models of accretion flows on to black holes. Such discs are prone to a global non-axisymmetric hydrodynamic instability, known as Papaloizou-Pringle instability (PPI), which can redistribute angular momentum and also lead to an emission of gravitational waves. It is, however, not clear yet how the development of the PPI is affected by the presence of a magnetic field and by the concurrent development of the magnetorotational instability (MRI). We present a numerical analysis using three-dimensional GRMHD simulations of the interplay between the PPI and the MRI considering, for the first time, an analytical magnetized equilibrium solution as initial condition. In the purely hydrodynamic case, the PPI selects as expected the large-scale m = 1 azimuthal mode as the fastest growing and non-linearly dominant mode. However, when the torus is threaded by a weak toroidal magnetic field, the development of the MRI leads to the suppression of large-scale modes and redistributes power across smaller scales. If the system starts with a significantly excited m = 1 mode, the PPI can be dominant in a transient phase, before being ultimately quenched by the MRI. Such dynamics may well be important in compact star mergers and tidal disruption events.
URI: http://hdl.handle.net/20.500.12386/28063
URL: https://arxiv.org/abs/1707.01860
https://academic.oup.com/mnras/article/475/1/108/4718469
https://ui.adsabs.harvard.edu/abs/2018MNRAS.475..108B/
ISSN: 0035-8711
DOI: 10.1093/mnras/stx3158
Bibcode ADS: 2018MNRAS.475..108B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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