Proca stars with nonminimal coupling to the Einstein tensor

Minamitsuji, Masato

doi:10.1103/physrevd.96.044017

Cited by 11 publications

(8 citation statements)

References 48 publications

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“…Their GR limit were studied in Refs. [58,71], with static, regular, asymptotically flat metric [72]. Current proposals assert that massive spin-1 gauge field can compose dark matter.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Minimal geometric deformation of Yang-Mills-Dirac stellar configurations

Rocha

2020

Phys. Rev. D

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The method of minimal geometric deformation (MGD) is used to derive static, strongly gravitating, spherically symmetric, compact stellar distributions that are solutions of the Yang-Mills-Einstein-Dirac coupled field equations, on fluid membranes with finite tension. Their solutions characterize MGD Yang-Mills-Dirac stars, whose mass has order of the Chandrasekhar mass, once the range of both the fermionic self-interaction and the Yang-Mills coupling constants is suitably chosen. Physical features of MGD Yang-Mills-Dirac stars are then discussed, and their ADM mass are derived, as a function of the fermion coupling constant, the finite brane tension, and the Yang-Mills running parameter as well.

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“…Their GR limit were studied in Refs. [58,71], with static, regular, asymptotically flat metric [72]. Current proposals assert that massive spin-1 gauge field can compose dark matter.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Minimal geometric deformation of Yang-Mills-Dirac stellar configurations

Rocha

2020

Phys. Rev. D

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“…Proca stars form a characteristic spiraling pattern, when the mass or the charge are considered as functions of the boson frequency. Subsequent studies considered Proca stars with self-interaction [49,50] and charge [51], their time evolution [52], formation [53], and collisions [54], as well as Proca stars with nonminimal coupling to gravity [55].…”

Section: Introductionmentioning

confidence: 99%

Horndeski-Proca stars with vector hair

et al. 2022

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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 nonminimal 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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“…Examples of exotic compact objects relevant for our discussion are: boson stars [6][7][8], first introduced as regular solutions of Einstein-Klein-Gordon equations (see e.g. [9,10] for reviews), and then shown to exist also in the vector-tensor case [11][12][13]. Gravastar, supported by negative pressure fluids [14][15][16][17] (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Ultracompact vector stars

Tasinato

2022

Phys. Rev. D

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We analytically investigate a new family of horizonless compact objects in vector-tensor theories of gravity, called ultracompact vector stars. They are sourced by a vector condensate, induced by a non-minimal coupling with gravity. They can be as compact as black holes, thanks to their internal anisotropic stress. In the spherically symmetric case their interior resembles an isothermal sphere, with a singularity that can be resolved by tuning the available integration constants. The star interior smoothly matches to an exterior Schwarzschild geometry, with no need of extra energy momentum tensor at the star surface. We analyse the behaviour of geodesics within the star interior, where stable circular orbits are allowed, as well as trajectories crossing in both ways the star surface. We analytically study stationary deformations of the vector field and of the geometry, which break spherical symmetry, and whose features depend on the vector-tensor theory we consider. We introduce and determine the vector magnetic susceptibility as a probe of the star properties, and we analyze how the rate of rotation of the star is affected by the vector charges.

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Proca stars with nonminimal coupling to the Einstein tensor

Cited by 11 publications

References 48 publications

Minimal geometric deformation of Yang-Mills-Dirac stellar configurations

Minimal geometric deformation of Yang-Mills-Dirac stellar configurations

Horndeski-Proca stars with vector hair

Ultracompact vector stars

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