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Nonminimally coupled scalar field in teleparallel gravity : boson stars (CROSBI ID 215256)

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Horvat, Dubravko ; Ilijić, Saša ; Kirin, Anamarija ; Narančić, Zoran Nonminimally coupled scalar field in teleparallel gravity : boson stars // Classical and quantum gravity, 32 (2015), 035023-1-035023-11. doi: 10.1088/0264-9381/32/3/035023

Podaci o odgovornosti

Horvat, Dubravko ; Ilijić, Saša ; Kirin, Anamarija ; Narančić, Zoran

engleski

Nonminimally coupled scalar field in teleparallel gravity : boson stars

We study the nonminimally coupled complex scalar field within the framework of teleparallel gravity. Coupling of the field nonminimally to the torsion scalar destroys the Lorentz invariance of the theory in the sense that the resulting equations of motion depend on the choice of a tetrad. For the assumed static spherically symmetric spacetime, we find the tetrad which leads to a self-consistent set of equations, and we construct the self-gravitating configurations of the scalar field---boson stars. The resulting configurations develop anisotropic principal pressures and satisfy the dominant energy condition. An interesting property of some configurations obtained with sufficiently large field-to-torsion coupling constant is the outwardly increasing energy density, followed by an abrupt drop toward the usual asymptotic tail. This feature is not present in the boson stars with the field minimally or nonminimally coupled to the curvature scalar, and therefore appears to be a torsion--only effect.

Teleparallel gravity; boson star; nonminimal coupling

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Podaci o izdanju

32

2015.

035023-1-035023-11

objavljeno

0264-9381

10.1088/0264-9381/32/3/035023

Povezanost rada

Fizika

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