Anisotropic stars as ultracompact objects in general relativity

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Anisotropic stars as ultracompact objects in general relativity. / Raposo, Guilherme; Pani, Paolo; Bezares, Miguel; Palenzuela, Carlos; Cardoso, Vitor.

In: Physical Review D, Vol. 99, No. 10, 104072, 28.05.2019.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Raposo, G, Pani, P, Bezares, M, Palenzuela, C & Cardoso, V 2019, 'Anisotropic stars as ultracompact objects in general relativity', Physical Review D, vol. 99, no. 10, 104072. https://doi.org/10.1103/PhysRevD.99.104072

APA

Raposo, G., Pani, P., Bezares, M., Palenzuela, C., & Cardoso, V. (2019). Anisotropic stars as ultracompact objects in general relativity. Physical Review D, 99(10), [104072]. https://doi.org/10.1103/PhysRevD.99.104072

Vancouver

Raposo G, Pani P, Bezares M, Palenzuela C, Cardoso V. Anisotropic stars as ultracompact objects in general relativity. Physical Review D. 2019 May 28;99(10). 104072. https://doi.org/10.1103/PhysRevD.99.104072

Author

Raposo, Guilherme ; Pani, Paolo ; Bezares, Miguel ; Palenzuela, Carlos ; Cardoso, Vitor. / Anisotropic stars as ultracompact objects in general relativity. In: Physical Review D. 2019 ; Vol. 99, No. 10.

Bibtex

@article{5b0e5cd4e88a497a977c2388e4f462a0,
title = "Anisotropic stars as ultracompact objects in general relativity",
abstract = "Anisotropic stresses are ubiquitous in nature, but their modeling in general relativity is poorly understood and frame dependent. We introduce the first study on the dynamical properties of anisotropic self-gravitating fluids in a covariant framework. Our description is particularly useful in the context of tests of the black hole paradigm, wherein ultracompact objects are used as black hole mimickers but otherwise lack a proper theoretical framework. We show the following: (i) anisotropic stars can be as compact and as massive as black holes, even for very small anisotropy parameters; (ii) the nonlinear dynamics of the 1 + 1 system is in good agreement with linearized calculations, and shows that configurations below the maximum mass are nonlinearly stable; (iii) strongly anisotropic stars have vanishing tidal Love numbers in the black-hole limit; and (iv) their formation will usually be accompanied by gravitational-wave echoes at late times.",
keywords = "GRAVASTARS, SPHERES, MODELS",
author = "Guilherme Raposo and Paolo Pani and Miguel Bezares and Carlos Palenzuela and Vitor Cardoso",
year = "2019",
month = may,
day = "28",
doi = "10.1103/PhysRevD.99.104072",
language = "English",
volume = "99",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "10",

}

RIS

TY - JOUR

T1 - Anisotropic stars as ultracompact objects in general relativity

AU - Raposo, Guilherme

AU - Pani, Paolo

AU - Bezares, Miguel

AU - Palenzuela, Carlos

AU - Cardoso, Vitor

PY - 2019/5/28

Y1 - 2019/5/28

N2 - Anisotropic stresses are ubiquitous in nature, but their modeling in general relativity is poorly understood and frame dependent. We introduce the first study on the dynamical properties of anisotropic self-gravitating fluids in a covariant framework. Our description is particularly useful in the context of tests of the black hole paradigm, wherein ultracompact objects are used as black hole mimickers but otherwise lack a proper theoretical framework. We show the following: (i) anisotropic stars can be as compact and as massive as black holes, even for very small anisotropy parameters; (ii) the nonlinear dynamics of the 1 + 1 system is in good agreement with linearized calculations, and shows that configurations below the maximum mass are nonlinearly stable; (iii) strongly anisotropic stars have vanishing tidal Love numbers in the black-hole limit; and (iv) their formation will usually be accompanied by gravitational-wave echoes at late times.

AB - Anisotropic stresses are ubiquitous in nature, but their modeling in general relativity is poorly understood and frame dependent. We introduce the first study on the dynamical properties of anisotropic self-gravitating fluids in a covariant framework. Our description is particularly useful in the context of tests of the black hole paradigm, wherein ultracompact objects are used as black hole mimickers but otherwise lack a proper theoretical framework. We show the following: (i) anisotropic stars can be as compact and as massive as black holes, even for very small anisotropy parameters; (ii) the nonlinear dynamics of the 1 + 1 system is in good agreement with linearized calculations, and shows that configurations below the maximum mass are nonlinearly stable; (iii) strongly anisotropic stars have vanishing tidal Love numbers in the black-hole limit; and (iv) their formation will usually be accompanied by gravitational-wave echoes at late times.

KW - GRAVASTARS

KW - SPHERES

KW - MODELS

U2 - 10.1103/PhysRevD.99.104072

DO - 10.1103/PhysRevD.99.104072

M3 - Journal article

VL - 99

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 10

M1 - 104072

ER -

ID: 298640096