We present accurate simulations of the dynamical bar-mode instability in full general relativity focusing on two aspects which have not been investigated in detail in the past, namely, on the persistence of the bar deformation once the instability has reached its saturation and on the precise determination of the threshold for the onset of the instability in terms of the parameter \beta=T/|W|. We find that generic nonlinear mode-coupling effects appear during the development of the instability and these can severely limit the persistence of the bar deformation and eventually suppress the instability. In addition, we observe the dynamics of the instability to be strongly influenced by the value \beta and on its separation from the critical value \beta_c marking the onset of the instability. We discuss the impact these results have on the detection of gravitational waves from this process and provide evidence that the classical perturbative analysis of the bar-mode instability for Newtonian and incompressible Maclaurin spheroids remains qualitatively valid and accurate also in full general relativity.

Accurate simulations of the dynamical bar-mode instability in full General Relativity / Baiotti, L; DE PIETRI, Roberto; Manca, G. M.; Rezzolla, L.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 75:(2007), pp. 044023-1-044023-24. [10.1103/PhysRevD.75.044023]

Accurate simulations of the dynamical bar-mode instability in full General Relativity

DE PIETRI, Roberto;
2007-01-01

Abstract

We present accurate simulations of the dynamical bar-mode instability in full general relativity focusing on two aspects which have not been investigated in detail in the past, namely, on the persistence of the bar deformation once the instability has reached its saturation and on the precise determination of the threshold for the onset of the instability in terms of the parameter \beta=T/|W|. We find that generic nonlinear mode-coupling effects appear during the development of the instability and these can severely limit the persistence of the bar deformation and eventually suppress the instability. In addition, we observe the dynamics of the instability to be strongly influenced by the value \beta and on its separation from the critical value \beta_c marking the onset of the instability. We discuss the impact these results have on the detection of gravitational waves from this process and provide evidence that the classical perturbative analysis of the bar-mode instability for Newtonian and incompressible Maclaurin spheroids remains qualitatively valid and accurate also in full general relativity.
2007
Accurate simulations of the dynamical bar-mode instability in full General Relativity / Baiotti, L; DE PIETRI, Roberto; Manca, G. M.; Rezzolla, L.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 75:(2007), pp. 044023-1-044023-24. [10.1103/PhysRevD.75.044023]
File in questo prodotto:
File Dimensione Formato  
SEL_01_16PhysRevD75a2007p044023.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.87 MB
Formato Adobe PDF
1.87 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
SEL_01_16PhysRevD75a2007p044023.txt

non disponibili

Tipologia: Abstract
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.31 kB
Formato Text
1.31 kB Text   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1511353
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 89
  • ???jsp.display-item.citation.isi??? 86
social impact