Boson stars in higher-derivative gravity

Baibhav, Vishal; Maity, Debaprasad

doi:10.1103/physrevd.95.024027

Cited by 17 publications

(16 citation statements)

References 18 publications

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“…Irrespective of the sign of the nonzero nonminimal coupling parameter, PSs with the maximal values of the ADM mass and the Noether charge were always gravitationally bound. Such behaviors of PSs were similar to those observed for BSs in the EGB theory [30,31], EdGB theory [32], and complex scalar-tensor theory with nonminimal derivative coupling to the Einstein tensor [29]. Thus, they would be generic for gravitational theories including healthy higher-derivative terms.…”

Section: Discussionsupporting

confidence: 75%

“…On the other hand, for negative nonminimal derivative coupling parameters, the evolution equations do not become singular, but for larger central amplitudes enhanced resolutions are requested. Similar properties have been observed for BSs in the Einstein-Gauss-Bonnet (EGB) [30,31] and Einstein dilaton Gauss-Bonnet (EdGB) [32] theories.…”

Section: Introductionsupporting

confidence: 75%

“…As we discussed in Sec. IV A, for β = 0.2, we [30,31], the EdGB theory [32] and the complex scalar-tensor theory with nonminimal derivative coupling to the Einstein tensor [29]. Thus, they may be generic for healthy higher-derivative theories.…”

Section: A Frequencymentioning

confidence: 92%

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Proca stars with nonminimal coupling to the Einstein tensor

Minamitsuji

2017

Phys. Rev. D

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We investigate Proca star (PS) solutions, namely boson star (BS) type solutions for a complex vector field with mass and nonminimal coupling to the Einstein tensor. Irrespective of the existence of nonminimal coupling, PS solutions are mini-BS type, but the inclusion of it changes properties. For positive nonminimal coupling parameters, PS solutions do not exist for central amplitudes above some certain value due to the singular behavior of the evolution equations. For negative nonminimal coupling parameters, there is no such singular behavior but sufficiently enhanced numerical resolutions are requested for larger amplitudes. Irrespective of the sign of the nonzero nonminimal coupling parameter, PSs with the maximal Arnowitt-Deser-Misner mass and Noether charge are gravitationally bound. Properties of PSs are very similar to those of BSs in scalar-tensor theories including healthy higher-derivative terms.PACS numbers: 04.40.-b Self-gravitating systems; continuous media and classical fields in curved spacetime, 04.50.Kd Modified theories of gravity.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionsupporting

confidence: 75%

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Proca stars with nonminimal coupling to the Einstein tensor

Minamitsuji

2017

Phys. Rev. D

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“…( 2015 ). A non-minimal coupling between a complex scalar field and the Gauss–Bonnet term was studied in Baibhav and Maity ( 2017 ). Coupling Einstein gravity to a complex self-interacting boson field as well as a phantom field allows for new type of configurations, namely boson stars harboring a wormhole at their core (Dzhunushaliev et al.…”

Section: Varieties Of Boson Starsmentioning

confidence: 99%

Dynamical boson stars

2017

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The idea of stable, localized bundles of energy has strong appeal as a model for particles. In the 1950s, John Wheeler envisioned such bundles as smooth configurations of electromagnetic energy that he called geons, but none were found. Instead, particle-like solutions were found in the late 1960s with the addition of a scalar field, and these were given the name boson stars. Since then, boson stars find use in a wide variety of models as sources of dark matter, as black hole mimickers, in simple models of binary systems, and as a tool in finding black holes in higher dimensions with only a single Killing vector. We discuss important varieties of boson stars, their dynamic properties, and some of their uses, concentrating on recent efforts.

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“…Such boson stars with scalar fields have been widely investigated ever since (see e.g., [30][31][32][33]). But scalar boson stars have also been studied in a variety of extended gravity models [34][35][36][37][38][39][40][41][42]. In contrast, boson stars composed of vector fields, i.e., Proca stars, have only been considered in more recent times.…”

Section: Introductionmentioning

confidence: 99%

Horndeski Proca stars with vector hair

Brihaye,

Hartmann,

Kleihaus

et al. 2021

Preprint

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We study Proca stars in a vector-tensor gravity model inspired by Horndeski's generalized Einstein-Maxwell field equations, supplemented with a mass term for the vector field. We discuss the effects of the non-minimal coupling term on the properties of the resulting Proca stars. We show that the sign of the coupling constant is crucial in determining the generic properties of these generalized Proca star solutions, as soon as the magnitude of the coupling constant is sufficiently large to allow for significant deviations from the standard Proca star case. For negative coupling constant we observe a new type of limiting behavior for the generalized Proca stars, where the spacetime splits into an interior region with matter fields and an exterior Schwarzschild region.

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Boson stars in higher-derivative gravity

Cited by 17 publications

References 18 publications

Proca stars with nonminimal coupling to the Einstein tensor

Proca stars with nonminimal coupling to the Einstein tensor

Dynamical boson stars

Horndeski Proca stars with vector hair

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