Multicenter solutions in Eddington-inspired Born–Infeld gravity

Olmo, Gonzalo J.; Orazi, Emanuele; Rubiera-García, Diego

doi:10.1140/epjc/s10052-020-08591-7

Cited by 18 publications

(14 citation statements)

References 68 publications

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“…These are dubbed as Ricci-based gravities (RBGs), and the main weapon is the so-called mapping method [20]. This method establishes a correspondence between the spaces of solutions of two RBG theories, in particular allowing to generate solutions of a given RBG starting from a seed GR solution, via purely algebraic transformations [21][22][23]. Critical in this procedure is the identification of the matter Lagrangians sourcing the RBG/GR sides of the map, a point that has been systematically implemented for several types of matter fields [24,25].…”

Section: Introductionmentioning

confidence: 99%

An infinite class of exact rotating black hole metrics of modified gravity

Afonso,

Mora-Pérez,

Olmo

et al. 2021

Preprint

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We build an infinite class of exact axisymmetric solutions of a metric-affine gravity theory, namely, Eddington-inspired Born-Infeld gravity, coupled to an anisotropic fluid as a matter source. The solution-generating method employed is not unique of this theory but can be extended to other Ricci-Based Gravity theories (RBGs), a class of theories built out of contractions of the Ricci tensor with the metric. This method exploits a correspondence between the space of solutions of General Relativity and that of RBGs, and is independent of the symmetries of the problem. For the particular case in which the fluid is identified with non-linear electromagnetic fields we explicitly derive the corresponding axisymmetric solutions. Finally, we use this result to work out the counterpart of the Kerr-Newman black hole when Maxwell electrodynamics is set on the metric-affine side. Our results open up an exciting new avenue for testing new gravitational phenomenology in the fields of gravitational waves and shadows out of rotating black holes.

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Section: Introductionmentioning

confidence: 99%

An infinite class of exact rotating black hole metrics of modified gravity

Afonso,

Mora-Pérez,

Olmo

et al. 2021

Preprint

Self Cite

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“…This way, once a seed solution on the GR side is known, one can find the counterpart on the RBG side via purely algebraic transformations. In vacuum, this mapping trivializes and one recovers GR and its solutions, but in the presence of matter sources new exact solutions of these theories have been found in axially symmetric scenarios [42,43] and even in setups without symmetries [44], allowing to explore the phenomenology of metric-affine theories in a much more efficient way [45].…”

Section: Introductionmentioning

confidence: 97%

Charged BTZ-type solutions in Eddington-inspired Born-Infeld gravity

Guerrero,

Mora-Pérez,

Olmo

et al. 2021

Preprint

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We construct an axially symmetric solution of Eddington-inspired Born-Infeld gravity coupled to an electromagnetic field in 2+1 dimensions including a (negative) cosmological constant term. This is achieved by using a recently developed mapping procedure that allows to generate solutions in certain families of metric-affine gravity theories starting from a known seed solution of General Relativity, which in the present case corresponds to the electrically charged Banados-Teitelboim-Zanelli (BTZ) solution. We discuss the main features of the new configurations, including the modifications to the ergospheres and horizons, the emergence of wormhole structures, and the consequences for the regularity (or not) of these space-times via geodesic completeness.

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“…In fact, starting from a known solution of GR with a spherically symmetric, static, massless real scalar field, which represents a naked singularity, it was possible to obtain new exotic compact objects such as wormholes and other configurations with peculiar causal properties within the high density region but almost identical to the standard GR solution in its exterior regions (where the energy density rapidly drops to zero and the dynamics tends to that of GR). New exact rotating solutions [62,63] and even multicenter solutions [64] (without de-fined symmetry) have been constructed using this approach.…”

Section: Introductionmentioning

confidence: 99%

Boson stars in Palatini $f(\mathcal{R})$ gravity

Masó-Ferrando,

Sanchis-Gual,

Font

et al. 2021

Preprint

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We explore equilibrium solutions of spherically symmetric boson stars in the Palatini formulation of f (R) gravity. We account for the modifications introduced in the gravitational sector by using a recently established correspondence between modified gravity with scalar matter and general relativity with modified scalar matter. We focus on the quadratic theory f (R) = R + ξR 2 and compare its solutions with those found in general relativity, exploring both positive and negative values of the coupling parameter ξ. As matter source, a complex, massive scalar field with and without self-interaction terms is considered. Our results show that the existence curves of boson stars in Palatini f (R) gravity are fairly similar to those found in general relativity. Major differences are observed for negative values of the coupling parameter which results in a repulsive gravitational component for high enough scalar field density distributions. Adding self-interactions makes the degeneracy between f (R) and general relativity even more pronounced, leaving very little room for observational discrimination between the two theories.

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Multicenter solutions in Eddington-inspired Born–Infeld gravity

Cited by 18 publications

References 68 publications

An infinite class of exact rotating black hole metrics of modified gravity

An infinite class of exact rotating black hole metrics of modified gravity

Charged BTZ-type solutions in Eddington-inspired Born-Infeld gravity

Boson stars in Palatini $f(\mathcal{R})$ gravity

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