View in EDS HTML Full Text PDF Full Text

Shadow geometry of Kerr MOG naked singularity and analysis of accretion disk luminosity.

Saved in:
Bibliographic Details
Title: Shadow geometry of Kerr MOG naked singularity and analysis of accretion disk luminosity.
Authors: Yasmin, Saira1 (AUTHOR) sairayasmeen555@gmail.com, Jamil, Mubasher1,2 (AUTHOR) mjamil@sns.nust.edu.pk
Source: European Physical Journal C -- Particles & Fields. Dec2025, Vol. 85 Issue 12, p1-20. 20p.
Subjects: Accretion disks, Luminosity, Mathematical singularities, Astrophysics, Radiation, Spacetime
Abstract: Naked singularities are hypothetical astrophysical entities featuring gravitational singularities without event horizons. In this study, we analyze the shadow properties of Kerr modified gravity (Kerr MOG) naked singularities (KMNSs). We show that the KMNS shadow can appear closed or open, or can even vanish, depending on the dimensionless spin parameter a, the modified gravity parameter α , and the observer's inclination angle. We identify the critical conditions under which the KMNS shadow develops a gap, a unique feature not present in black hole (BH) shadows. We analyze the properties of a thin accretion disk surrounding a KMNS within the framework of MOG characterized by the parameter α. The study includes a detailed examination of the spacetime geometry and the equations of motion for test particles. In addition, we adopt a simplified model for the disk's radiative flux, temperature distribution, and spectral luminosity. Our analysis primarily focuses on the flux distribution of the accretion disk around the KMNS with identical mass but varying spin and MOG deformation parameters. This allows us to explore how modifications in rotation and the MOG parameter α influence the radiative properties of the disk. Further, these observational signatures may serve as effective tools for clearly distinguishing KMNSs from standard Kerr naked singularities (KNSs), where the MOG parameter α = 0 . [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature 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
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: egs
DbLabel: Engineering Source
An: 190943128
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Shadow geometry of Kerr MOG naked singularity and analysis of accretion disk luminosity.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Yasmin%2C+Saira%22">Yasmin, Saira</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sairayasmeen555@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Jamil%2C+Mubasher%22">Jamil, Mubasher</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> mjamil@sns.nust.edu.pk</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Dec2025, Vol. 85 Issue 12, p1-20. 20p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Accretion+disks%22">Accretion disks</searchLink><br /><searchLink fieldCode="DE" term="%22Luminosity%22">Luminosity</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+singularities%22">Mathematical singularities</searchLink><br /><searchLink fieldCode="DE" term="%22Astrophysics%22">Astrophysics</searchLink><br /><searchLink fieldCode="DE" term="%22Radiation%22">Radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Spacetime%22">Spacetime</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Naked singularities are hypothetical astrophysical entities featuring gravitational singularities without event horizons. In this study, we analyze the shadow properties of Kerr modified gravity (Kerr MOG) naked singularities (KMNSs). We show that the KMNS shadow can appear closed or open, or can even vanish, depending on the dimensionless spin parameter a, the modified gravity parameter α , and the observer's inclination angle. We identify the critical conditions under which the KMNS shadow develops a gap, a unique feature not present in black hole (BH) shadows. We analyze the properties of a thin accretion disk surrounding a KMNS within the framework of MOG characterized by the parameter α. The study includes a detailed examination of the spacetime geometry and the equations of motion for test particles. In addition, we adopt a simplified model for the disk's radiative flux, temperature distribution, and spectral luminosity. Our analysis primarily focuses on the flux distribution of the accretion disk around the KMNS with identical mass but varying spin and MOG deformation parameters. This allows us to explore how modifications in rotation and the MOG parameter α influence the radiative properties of the disk. Further, these observational signatures may serve as effective tools for clearly distinguishing KMNSs from standard Kerr naked singularities (KNSs), where the MOG parameter α = 0 . [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=190943128
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1140/epjc/s10052-025-15147-0
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 20
        StartPage: 1
    Subjects:
      – SubjectFull: Accretion disks
        Type: general
      – SubjectFull: Luminosity
        Type: general
      – SubjectFull: Mathematical singularities
        Type: general
      – SubjectFull: Astrophysics
        Type: general
      – SubjectFull: Radiation
        Type: general
      – SubjectFull: Spacetime
        Type: general
    Titles:
      – TitleFull: Shadow geometry of Kerr MOG naked singularity and analysis of accretion disk luminosity.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Yasmin, Saira
      – PersonEntity:
          Name:
            NameFull: Jamil, Mubasher
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 12
              Text: Dec2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 14346044
          Numbering:
            – Type: volume
              Value: 85
            – Type: issue
              Value: 12
          Titles:
            – TitleFull: European Physical Journal C -- Particles & Fields
              Type: main
ResultId 1