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Constrained deflection angle and shadows of rotating black holes in Einstein–Maxwell-scalar theory.

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Title: Constrained deflection angle and shadows of rotating black holes in Einstein–Maxwell-scalar theory.
Authors: Belmahi, Hajar1 (AUTHOR) hajar_belmahi@um5.ac.ma
Source: International Journal of Geometric Methods in Modern Physics. Aug2026, Vol. 23 Issue 9, p1-14. 14p.
Subjects: Deflection (Light), Black holes, Gravitation, Event Horizon Telescope, Hamilton-Jacobi equations, Kerr black holes
Abstract: Motivated by recent Event Horizon Telescope collaboration findings, we investigate constrained optics of rotating black holes in Einstein–Maxwell-scalar gravity theory. Precisely, we mainly study the parameter effects on two relevant optical concepts being the shadow and deflection angle. Using the Hamilton–Jacobi algorithm, we find certain shadow geometries being corroborated by observational data once appropriate constraints on a stringy coupling parameter β are imposed. For such constrained regions of the black hole moduli space, we compute the deflection angle of light rays near to such black holes. Concretely, we show that this optical quantity can be split into two contributions describing the absence and the presence of the coupling parameter β. Then, we discuss and analyse such optical quantity in terms of such β contributions. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Geometric Methods in Modern Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192935551
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PubTypeId: academicJournal
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  Data: Constrained deflection angle and shadows of rotating black holes in Einstein–Maxwell-scalar theory.
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  Data: <searchLink fieldCode="AR" term="%22Belmahi%2C+Hajar%22">Belmahi, Hajar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hajar_belmahi@um5.ac.ma</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Geometric+Methods+in+Modern+Physics%22">International Journal of Geometric Methods in Modern Physics</searchLink>. Aug2026, Vol. 23 Issue 9, p1-14. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Deflection+%28Light%29%22">Deflection (Light)</searchLink><br /><searchLink fieldCode="DE" term="%22Black+holes%22">Black holes</searchLink><br /><searchLink fieldCode="DE" term="%22Gravitation%22">Gravitation</searchLink><br /><searchLink fieldCode="DE" term="%22Event+Horizon+Telescope%22">Event Horizon Telescope</searchLink><br /><searchLink fieldCode="DE" term="%22Hamilton-Jacobi+equations%22">Hamilton-Jacobi equations</searchLink><br /><searchLink fieldCode="DE" term="%22Kerr+black+holes%22">Kerr black holes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Motivated by recent Event Horizon Telescope collaboration findings, we investigate constrained optics of rotating black holes in Einstein–Maxwell-scalar gravity theory. Precisely, we mainly study the parameter effects on two relevant optical concepts being the shadow and deflection angle. Using the Hamilton–Jacobi algorithm, we find certain shadow geometries being corroborated by observational data once appropriate constraints on a stringy coupling parameter β are imposed. For such constrained regions of the black hole moduli space, we compute the deflection angle of light rays near to such black holes. Concretely, we show that this optical quantity can be split into two contributions describing the absence and the presence of the coupling parameter β. Then, we discuss and analyse such optical quantity in terms of such β contributions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Geometric Methods in Modern Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1142/S0219887825502482
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 1
    Subjects:
      – SubjectFull: Deflection (Light)
        Type: general
      – SubjectFull: Black holes
        Type: general
      – SubjectFull: Gravitation
        Type: general
      – SubjectFull: Event Horizon Telescope
        Type: general
      – SubjectFull: Hamilton-Jacobi equations
        Type: general
      – SubjectFull: Kerr black holes
        Type: general
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      – TitleFull: Constrained deflection angle and shadows of rotating black holes in Einstein–Maxwell-scalar theory.
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          Dates:
            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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              Value: 23
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              Value: 9
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            – TitleFull: International Journal of Geometric Methods in Modern Physics
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