Rotating wormhole solutions with a complex phantom scalar field

Chew, Xiao Yan; Kleihaus, Burkhard; Kunz, Jutta; Dzhunushaliev, Vladimir; Folomeev, Vladimir

doi:10.1103/physrevd.100.044019

Cited by 30 publications

(16 citation statements)

References 72 publications

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“…The construction of the analytic wormhole solutions in various theories become quite prominent nowadays [18][19][20][21][22][23][24][25][26][27]. In particular, the paper [18] generalizes the Ellis wormhole to carry electric charges in the Einstein-Maxwell dilaton (EMD) theory where the dilaton is phantomlike.…”

Section: Introductionmentioning

confidence: 99%

Charged Ellis wormhole and black bounce

Huang

Yang

2019

Phys. Rev. D

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By replacing the scalar φ with iφ in the solution constructed in Ref [1], we obtain electrically-charged wormhole and black hole solutions in the Einstein-Maxwell-scalar theory, in which the scalar is a phantom field coupled to the Maxwell field non-minimally.Our solutions are simpler than the previously-known charged wormholes in the Einstein-Maxwell-dilaton theory in that both the scalar and the radius of the foliating sphere of our solutions are independent of electric charge. The wormhole solution has two asymptotically flat regions and reduces to Ellis wormhole when the charge is zero. We draw the embedding diagrams for the wormholes and demonstrate that the two sides are asymmetric. As the charge increases, horizons will appear, and the wormhole becomes a black hole, with no curvature singularity but a wormhole throat or a bounce. We analyze black hole thermodynamics and the causal structure. We also determine the photon spheres of both the wormhole and the black hole and discuss their observable characteristics.

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Section: Introductionmentioning

confidence: 99%

Charged Ellis wormhole and black bounce

Huang

Yang

2019

Phys. Rev. D

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“…Further, Ellis also found the evolving version of his solution [15]. Then it is sufficiently motivated for finding the charged or rotating wormhole [16][17][18]. Some researchers even proof the unique theorem for wormhole solutions in the Einstein-Maxwell-scalar theory [19,20].…”

Section: Introductionmentioning

confidence: 99%

Trapping Horizons of the Evolving Charged Wormhole and Black Bounce

Yang,

Huang

2021

Preprint

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We obtain one family of dynamic solutions in the Einstein-Maxwell-scalar(EMS) theory.Our solutions could describe the evolving charged black(white) hole or wormhole and their transition, including the case of black bounce/wormhole transition. We compare different wormhole throat definitions and suggest that the usage of trapping horizons is the most suitable choice for tracking the evolution of the dynamic black(white) hole, wormhole, and their conversion in a unified framework. Then we research several evolving processes in appropriate parameters region, including the charge, the initial condition for the scalar hair, and parameters in our EMS Lagrangian. The results show that the appearance of a degenerate marginal trapped surface is the crucial event for the conversion or transition, particularly in these cases: i) when the evolving wormhole converts to a black hole, the surface emerges and splits into two trapping horizons; ii) if the metric would become a black hole but finally fails, two trapping horizons combine as the surface and then vanish;iii) if the black bounce/wormhole transition happens, one single trapping horizon changes its type.

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“…The equation of state (EoS) of nuclear matter is still a mystery in addition to the fundamental question whether general relativity (GR) or modified gravity [50][51][52][53][54][55][56][57] controls the physics of the star. A particularly appealing form of modified gravity is scalar-tensor gravity, and many works on NSs in the context of scalar-tensor gravity already exist in the literature [58][59][60][61][62][63][64][65][66][67][68][69][70][71]. Also scalar-tensor gravity is popular in cosmological contexts too [72][73][74][75][76][77][78][79][80][81][82][83][84], where viable inflationary models can be realized.…”

Section: Introductionmentioning

confidence: 99%

Uniqueness of the Inflationary Higgs Scalar for Neutron Stars and Failure of Non-Inflationary Approximations

Oikonomou

2021

Symmetry

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Neutron stars are perfect candidates to investigate the effects of a modified gravity theory, since the curvature effects are significant and more importantly, potentially testable. In most cases studied in the literature in the context of massive scalar-tensor theories, inflationary models were examined. The most important of scalar-tensor models is the Higgs model, which, depending on the values of the scalar field, can be approximated by different scalar potentials, one of which is the inflationary. Since it is not certain how large the values of the scalar field will be at the near vicinity and inside a neutron star, in this work we will answer the question, which potential form of the Higgs model is more appropriate in order for it to describe consistently a static neutron star. As we will show numerically, the non-inflationary Higgs potential, which is valid for certain values of the scalar field in the Jordan frame, leads to extremely large maximum neutron star masses; however, the model is not self-consistent, because the scalar field approximation used for the derivation of the potential, is violated both at the center and at the surface of the star. These results shows the uniqueness of the inflationary Higgs potential, since it is the only approximation for the Higgs model, that provides self-consistent results.

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Rotating wormhole solutions with a complex phantom scalar field

Cited by 30 publications

References 72 publications

Charged Ellis wormhole and black bounce

Charged Ellis wormhole and black bounce

Trapping Horizons of the Evolving Charged Wormhole and Black Bounce

Uniqueness of the Inflationary Higgs Scalar for Neutron Stars and Failure of Non-Inflationary Approximations

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