Compact object scalarization with general relativity as a cosmic attractor

Antoniou, Georgios; Bordin, Lorenzo; Sotiriou, Thomas P.

doi:10.1103/physrevd.103.024012

Cited by 27 publications

(25 citation statements)

References 39 publications

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“…Moreover, it has been shown in Ref. [29] that this coupling makes GR a cosmological attractor and hence reconciles Gauss-Bonnet scalarization with late-time cosmological observations. It has also been pointed out in Ref.…”

Section: Introductionsupporting

confidence: 55%

“…First, it has recently been shown that including the βφ 2 R term in black hole scalarization models and selecting a positive β makes GR a cosmological attractor and allows one to have a consistent cosmological history, at least from the end of the inflationary era [29]. The numerical values that we considered here for the couplings are similar to those used in [29]. Second, for positive values of the Ricci coupling (and reasonably small values of the Gauss-Bonnet coupling), neutron stars do not scalarize [23].…”

Section: Discussionmentioning

confidence: 99%

“…This scenario is motivated by the results of Ref. [29], where it was shown that positive values of β make GR a cosmological attractor. We start by exploring the solutions characterized by n = 0.…”

Section: A N = 0 Nodes For the Scalar Profilementioning

confidence: 96%

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Black hole scalarization with Gauss-Bonnet and Ricci scalar couplings

et al. 2021

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Spontaneous scalarization is a gravitational phenomenon in which deviations from general relativity arise once a certain threshold in curvature is exceeded, while being entirely absent below that threshold. For black holes, scalarization is known to be triggered by a coupling between a scalar and the Gauss-Bonnet invariant. A coupling with the Ricci scalar, which can trigger scalarization in neutron stars, is instead known to not contribute to the onset of black hole scalarization, and has so far been largely ignored in the literature when studying scalarized black holes. In this paper, we study the combined effect of both these couplings on black hole scalarization. We show that the Ricci coupling plays a significant role in the properties of scalarized solutions and their domain of existence. This work is an important step in the construction of scalarization models that evade binary pulsar constraints and have general relativity as a cosmological late-time attractor, while still predicting deviations from general relativity in black hole observations.

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Section: Introductionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

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Black hole scalarization with Gauss-Bonnet and Ricci scalar couplings

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“…Let us concentrate on the β > 0 scenario, which is motivated by the results of Ref. [29], where it was shown that positive values of β make GR a cosmological attractor. We remind that black hole scalarization (at least for non-rotating black holes) occurs for α > 0.…”

Section: Heavy Star With Sly Eosmentioning

confidence: 99%

“…Nonetheless, including the Ricci term does seem to provide us with several advantages. To begin with, as discussed in [29], the Ricci term is crucial if one wants to retrieve a late-time attractor to GR in a cosmological scenario. Additionally, it was shown in [30] that the Ricci term can help in suppressing the scalarization of neutron stars, which would otherwise tend to place significant constraints.…”

Section: Introductionmentioning

confidence: 99%

Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings

et al. 2021

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Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Farèse model, in which a scalar field couples to the Ricci scalar or, equivalently, to the trace of the energy-momentum tensor. However, scalarization of both black holes and neutron stars may also be triggered by a coupling of the scalar field to the Gauss-Bonnet invariant. The case of the Gauss-Bonnet coupling has also received a lot of attention lately, but the synergy of the Ricci and Gauss-Bonnet couplings has been overlooked for neutron stars. Here, we show that combining both couplings has interesting effects on the properties of scalarized neutron stars, such as affecting their domain of existence or the amount of scalar charge they carry.

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