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Perturbation of mass accretion rate, associated acoustic geometry and stability analysis

Jul 8, 2014

8 pages

Published in:

New Astron. 51 (2017) 153-160

Published: Feb, 2017

e-Print:

1407.2268 [astro-ph.HE]

DOI:

10.1016/j.newast.2016.09.001

View in:

ADS Abstract Service

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Abstract: (Elsevier)

• We investigate the stability of stationary integral solutions of an ideal irrotational fluid in a general static and spherically symmetric background, by studying the profile of the perturbation of the mass accretion rate. • We consider low angular momentum axisymmetric accretion flows for three different accretion disk models and consider time dependent and radial linear perturbation of the mass accretion rate. • First we show that the propagation of such perturbation can be determined by an effective 2 × 2 matrix, which has qualitatively similar acoustic causal properties as one obtains via the perturbation of the velocity potential. • Next, using this matrix we analytically address the stability issues, for both standing and travelling wave configurations generated by the perturbation. • Finally, based on this general formalism we briefly discuss the explicit example of the Schwarzschild spacetime and compare our results of stability with the existing literature, which instead address this problem via the perturbation of the velocity potential.

Note:

v4, 15pp; discussions pertaining the stability analysis emphasized; main results unchanged; accepted in New Astronomy

04.25.-g
04.30.Db
97.60.Jd
11.10.Gh
Accretion astrophysics
Accretion disk
acoustic geometry
Stability

References(54)

Figures(0)

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