Retrograde polish doughnuts around boson stars

Teodoro, Matheus C.; Collodel, Lucas G.; Kunz, Jutta

doi:10.1088/1475-7516/2021/03/063

Cited by 15 publications

(7 citation statements)

References 64 publications

(125 reference statements)

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“…Thus, a particle could sit at rest right at the center. Also bound oscillating motion across the center is possible, as observed also in other regular spacetimes [87]. In Figs.…”

Section: Particle Motionsupporting

confidence: 69%

Particle-like ultracompact objects in Einstein-scalar-Gauss-Bonnet theories

2020

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We construct particle-like solutions in Einstein-scalar-Gauss-Bonnet theories in four spacetime dimensions, representing globally regular spacetime manifolds. The scalar field diverges at the origin, but the effective stress-energy tensor is free from pathologies. We determine their domain of existence and compare with wormhole solutions, black holes and Janis-Newman-Winicourt-Wyman (JNWW) solutions, also known as Fisher solution. Many of the particle-like solutions represent ultracompact objects, featuring a lightring and echos.Introduction.-In flat space time, numerous field theories possess non-perturbative localized solutions, describing particle-like objects, often simply termed solitons (see e.g. [1]). Famous examples are magnetic monopoles, Skyrmions and Q-balls. Typically, these solitons can be promoted to self-gravitating particle-like solutions, when coupled to Einstein gravity. But gravity also allows for similar particle-like solutions, that do not have a flat space time limit (see e.g. [2]). Yet the quest for particle-like solutions in gravity is in fact much older and was widely discussed in the context of geons by Wheeler and Brill and collaborators [3][4][5].Here we continue this quest for particle-like solutions in gravity, studying, however, generalized gravitational theories that are motivated from a quantum gravity perspective and include higher-curvature contributions in the action in the form of the quadratic Gauss-Bonnet (GB) term [6][7][8]. In four space-time dimensions, the coupling to a scalar field then leads to a class of Einstein-scalar-Gauss-Bonnet (EsGB) theories, characterized by the choice of the coupling function. EsGB black holes and their properties have been widely studied already, revealing new phenomena, like a minimum mass [9] or the violation of the Kerr bound [10] in the case of an exponential coupling function and, more recently, the presence of scalarization and the emergence of novel solutions with scalar hair for more general coupling functions [11][12][13][14][15][16].The presence of the GB term generalizes the field equations such that, when included on the right-hand side of the equations, an effective stress energy tensor arises, that may lead to violations of the energy conditions. Interestingly, such EsGB theories then give rise to wormhole solutions, that -in stark contrast to General Relativity (GR) -do not need any form of exotic matter [17][18][19]. Therefore, the presence of this plethora of new phenomena arising in EsGB theories makes one wonder whether gravitational geons, and thus particle-like solutions featuring a completely regular space-time should not be another astounding feature of these theories.Here we show that, for a set of coupling functions, this is indeed the case, by constructing numerous families of particle-like solutions, that possess a globally regular asymptotically flat metric and an everywhere regular effective stress energy tensor, although the scalar field of the solutions diverges at the center. We explore the solution space of t...

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“…Thus, a particle could sit at rest right at the center. Also bound oscillating motion across the center is possible, as observed also in other regular spacetimes [87]. In Figs.…”

Section: Particle Motionsupporting

confidence: 69%

Particle-like ultracompact objects in Einstein-scalar-Gauss-Bonnet theories

2020

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“…As shown in [19], spacetimes endowed with static orbits [36] can shelter static surfaces in the context of thick tori. While static orbits are circular geodesics in the equatorial plane, for which a particle remains static with respect to the ZAMO, static surfaces are their generalization for fluids.…”

Section: Constant Specific Angular Momentum Polish Doughnutsmentioning

confidence: 99%

“…GRMHD simulations with a similar setup are also used to address advection-dominated flows, the evolution of weakly magnetized disks, jet formation and the differences between possible images of black holes and boson stars (BS) [7,8,9,10,11,12]. Outside the context of GRMHD simulations, Polish doughnuts are also used to address possible tori geometries around exotic spacetimes such as Kerrde Sitter backgrounds, distorted static BHs, deformed compact objects, Kehagias-Sfetsos naked singularities and BSs [13,14,15,16,17,18,19]. Although some models of doughnuts may include magnetic fields and non-constant specific angular momentum distribution, the constant specific angular momentum case remains being an important first step in this field of research, since in this case the torus solutions are marginally stable for Kerr BHs and hold similar topologies as the ones found for different specific angular momentum distributions [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Polish Doughnuts around Scalarized Kerr Black Holes

Teodoro¹,

Collodel²,

Doneva³

et al. 2021

Preprint

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In this work we aim to investigate non-mainstream thick tori configurations around Kerr Black Holes with Scalar Hair (KBHsSH). For that goal, we provide a first approach using constant specific angular momentum non-self-gravitating Polish doughnuts. Through a series of examples, we show the feasibility of new topologies, such as double-centered tori with two cusps as well as similar structures as the ones found for rotating Boson Stars (BSs), namely tori endowed with two centers and a single cusp. These KBHsSH' solutions are also shown to possibly house static surfaces, associated to the static rings present in these spacetimes. Through this report we highlight the differences between these fluid configurations when housed by some KBHsSH examples, standard Kerr black holes and rotating BSs.

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“…In [77], the authors explored the Kα iron line of a sample of three quite different solutions of KBHsSH to see if they could, as a template, fit the fabricated data produced by a Kerr BH and found that two of them performed well enough to be dismissed. Thick tori (a generalization of the Polish Doughnut) have also been constructed for KBHsSH [78] and BSs [48,79], which can be used as initial data for dynamical simulations as well as for modeling the imaging of a dark compact object. Dynamical simulations of accreting disks and disruption events around BSs in comparison to BHS have been considered in [80,81], while the possibility of constraining the gravitational theory and object via our current imaging capacities is the subject of study in [82].…”

Section: Introductionmentioning

confidence: 99%

Circular Orbits Structure and Thin Accretion Disks around Kerr Black Holes with Scalar Hair

Collodel,

Doneva,

Yazadjiev

2021

Preprint

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Retrograde polish doughnuts around boson stars

Cited by 15 publications

References 64 publications

Particle-like ultracompact objects in Einstein-scalar-Gauss-Bonnet theories

Particle-like ultracompact objects in Einstein-scalar-Gauss-Bonnet theories

Polish Doughnuts around Scalarized Kerr Black Holes

Circular Orbits Structure and Thin Accretion Disks around Kerr Black Holes with Scalar Hair

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