Dark compact objects in massive tensor-multi-scalar theories of gravity

Yazadjiev, Stoytcho S.; Doneva, Daniela D.

doi:10.1103/physrevd.99.084011

Cited by 23 publications

(40 citation statements)

References 13 publications

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“…The focus of the present paper falls exactly in this area dealing with the less explored case of multiple scalar fields [3,4]. Such tensor-multi-scalar theories are on one hand complicated and difficult to handle, but on the other hand they posses a lot of freedom and possibilities to construct new and very interesting solutions [5][6][7]. In addition, they are in agreement with the observations and do not have severe intrinsic mathematical problems.…”

Section: Introductionmentioning

confidence: 75%

“…In the present paper we have generalized the solitonic solutions in tensor-multi-scalar theories obtained in [5] to the case of rapid rotating. The key essence in constructing such solutions is that we require the target space metric to admit Killing fields with a pedioc flow.…”

Section: Discussionmentioning

confidence: 99%

“…Another factor that has to be taken into account is the presence of conformal factor that relates the quantities in the Einstein frame and the physical Jordan frame. This conformal factor enters explicitly for example in the calculation of the effective radius of the soliton [5] thus different choices of A(ϕ) would lead to different compactness of the object. Therefore, different observational phenomena such as mergers of solitons, electromagnetic emission connected to accretion discs, as well as the modeling of dark matter as constituent of condensed gravitational scalars, will be strongly affected both by the choice of target space metric and of A(ϕ).…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, if the field's potential and the conformal factor are also invariant under the flow, i.e. L K V (ϕ) = K a ∂ a V (ϕ) = 0 and L K A(ϕ) = K a ∂ a A(ϕ) = 0, then K a is the generator of a one-parameter group of point transformations for which the whole theory is invariant, and a corresponding Jordan frame Noether current therefore exists, given by [5]…”

Section: Theory and Conserved Chargesmentioning

confidence: 99%

“…Here, Σ is a spacelike asymptotically flat hypersurface and n µ is a vector normal to Σ such that n µ n µ = −1. The metric (5) implies that n µ = (ξ µ + ω/rη µ )/ √ f . Substituting the Ricci tensor with aid of eq.…”

Section: Global Chargesmentioning

confidence: 99%

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In the context of a special class of tensor-multi-scalar theories of gravity for which the target-space metric admits an isometry under which the theory is invariant, we present rotating vacuum solutions, namely with no matter fields. These objects behave like nontopological solitons, whose primary stability is due to the conserved charge arising from the global symmetry. We consider theories with two and three scalar fields, different Gauss curvatures and quartic interaction coefficients. As it occurs for boson stars, their angular momentum is quantized.

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Section: Introductionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Theory and Conserved Chargesmentioning

confidence: 99%

Section: Global Chargesmentioning

confidence: 99%

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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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Stellar structure models in modified theories of gravity: Lessons and challenges

2020

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The understanding of stellar structure represents the crossroads of our theories of the nuclear force and the gravitational interaction under the most extreme conditions observably accessible. It provides a powerful probe of General Relativity on its strong field regime, and opens fruitful avenues for the exploration of new gravitational physics. The latter can be captured via the so-called modified theories of gravity, which modify the Einstein-Hilbert action of General Relativity and/or some of its building blocks/principles. These theories typically change the Tolman-Oppenheimer-Volkoff equations of stellar's hydrostatic equilibrium, having a large impact on the astrophysical properties of the corresponding stars, and thus opening a new window to constrain these theories with present and future observations of different types of stars. For relativistic stars, such as neutron stars, the uncertainty on the equation of state of matter at supranuclear densities intertwines with the new parameters coming from the modified gravity side, providing a whole new phenomenology for the typical predictions of stellar structure models, such as mass-radius relations, maximum masses, or moment of inertia. For non-relativistic stars, such as white, brown and red dwarfs, the weakening/strengthening of the gravitational force inside astrophysical bodies via the modified Newtonian (Poisson) equation may induce changes on the star's mass, radius, central density or luminosity, having an impact, for instance, in the Chandrasekhar's limit for white dwarfs, or in the minimum mass for stable hydrogen burning for high-mass brown dwarfs. This work aims to provide a broad overview of the main such results achieved in the recent literature for many such modified theories of gravity, by combining the results and constraints obtained from the analysis of relativistic and non-relativistic stars in different scenarios. Moreover, we will build a bridge between the efforts of the community working on different theories, formulations, types of stars, theoretical modellings, and observational aspects, highlighting some of the most promising opportunities in the field.

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Dark compact objects in massive tensor-multi-scalar theories of gravity

Cited by 23 publications

References 13 publications

Rotating tensor-multiscalar solitons

Rotating tensor-multiscalar solitons

Dynamical boson stars

Stellar structure models in modified theories of gravity: Lessons and challenges

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