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Bardeen stellar objects in f(ℛ,) modified gravity.

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Title: Bardeen stellar objects in f(ℛ,) modified gravity.
Authors: Malik, Adnan1,2 (AUTHOR) adnan.malik@skt.umt.edu.pk, Almas, Ayesha2 (AUTHOR) ayesha787@icloud.com, Mofarreh, Fatemah3 (AUTHOR) fyalmofarrah@pnu.edu.sa, Shafaq, Attiya2 (AUTHOR) attiyashafaq10@gmail.com, Farasat Shamir, M.4,5 (AUTHOR) f.shamir@qmul.ac.uk
Source: International Journal of Geometric Methods in Modern Physics. Jun2026, Vol. 23 Issue 7, p1-23. 23p.
Subjects: Compact objects (Astronomy), Stellar structure, Stability theory
Abstract: This study presents a comprehensive analysis of stellar configurations within the framework of f (ℛ ,) gravity, where ℛ represents the Ricci scalar denotes the anti-curvature scalar. This model aims to accurately describe compact stars, bridging general relativity with the modified f (ℛ ,) gravity. The research focuses on charged anisotropic matter distributions in static, spherically symmetric spacetimes and employs the Krori–Barua metric to relate the radial ( g r r ) and transverse ( g t t ) components of the line element. Parameter values are derived using Bardeen's star as the external geometry and observational data from 10 well-known compact stars, including PSR 1937 + 21, PSR J1614-2230, 4U 1608-52, Vela  X − 1 , PSR 1903 + 327, LMXC–4, Cen X–3, 4 U 1 8 2 0 − 3 0 , SMX J 1 8 0 8 − 3 6 5 8 and Her  X − 1. The study evaluates various physical properties, such as pressure distribution, equilibrium and stability conditions, energy density, energy conditions, mass function trends and adiabatic parameters, to validate the f (ℛ ,) model's applicability. The findings conclude that the f (ℛ ,) gravity model successfully supports the existence of compact stars with remarkable physical characteristics. [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: 192508750
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
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  Data: Bardeen stellar objects in f(ℛ,) modified gravity.
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  Data: <searchLink fieldCode="AR" term="%22Malik%2C+Adnan%22">Malik, Adnan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> adnan.malik@skt.umt.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Almas%2C+Ayesha%22">Almas, Ayesha</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> ayesha787@icloud.com</i><br /><searchLink fieldCode="AR" term="%22Mofarreh%2C+Fatemah%22">Mofarreh, Fatemah</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> fyalmofarrah@pnu.edu.sa</i><br /><searchLink fieldCode="AR" term="%22Shafaq%2C+Attiya%22">Shafaq, Attiya</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> attiyashafaq10@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Farasat+Shamir%2C+M%2E%22">Farasat Shamir, M.</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<i> f.shamir@qmul.ac.uk</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>. Jun2026, Vol. 23 Issue 7, p1-23. 23p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Compact+objects+%28Astronomy%29%22">Compact objects (Astronomy)</searchLink><br /><searchLink fieldCode="DE" term="%22Stellar+structure%22">Stellar structure</searchLink><br /><searchLink fieldCode="DE" term="%22Stability+theory%22">Stability theory</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study presents a comprehensive analysis of stellar configurations within the framework of f (ℛ ,) gravity, where ℛ represents the Ricci scalar denotes the anti-curvature scalar. This model aims to accurately describe compact stars, bridging general relativity with the modified f (ℛ ,) gravity. The research focuses on charged anisotropic matter distributions in static, spherically symmetric spacetimes and employs the Krori–Barua metric to relate the radial ( g r r ) and transverse ( g t t ) components of the line element. Parameter values are derived using Bardeen's star as the external geometry and observational data from 10 well-known compact stars, including PSR 1937 + 21, PSR J1614-2230, 4U 1608-52, Vela  X − 1 , PSR 1903 + 327, LMXC–4, Cen X–3, 4 U 1 8 2 0 − 3 0 , SMX J 1 8 0 8 − 3 6 5 8 and Her  X − 1. The study evaluates various physical properties, such as pressure distribution, equilibrium and stability conditions, energy density, energy conditions, mass function trends and adiabatic parameters, to validate the f (ℛ ,) model's applicability. The findings conclude that the f (ℛ ,) gravity model successfully supports the existence of compact stars with remarkable physical characteristics. [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/S0219887825502068
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      – Code: eng
        Text: English
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        PageCount: 23
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    Subjects:
      – SubjectFull: Compact objects (Astronomy)
        Type: general
      – SubjectFull: Stellar structure
        Type: general
      – SubjectFull: Stability theory
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      – TitleFull: Bardeen stellar objects in f(ℛ,) modified gravity.
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            NameFull: Malik, Adnan
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            NameFull: Almas, Ayesha
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            NameFull: Shafaq, Attiya
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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            – TitleFull: International Journal of Geometric Methods in Modern Physics
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