Anisotropic stars as ultracompact objects in general relativity
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Anisotropic stars as ultracompact objects in general relativity. / Raposo, Guilherme; Pani, Paolo; Bezares, Miguel; Palenzuela, Carlos; Cardoso, Vitor.
I: Physical Review D, Bind 99, Nr. 10, 104072, 28.05.2019.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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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