Physical properties and the maximum compactness bound of a class of compact stars in f(Q) gravity.
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| Title: | Physical properties and the maximum compactness bound of a class of compact stars in f(Q) gravity. |
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| Authors: | Ghosh, Arpita1 (AUTHOR) arpitaghosh92727@gmail.com, Paul, Abhishek1 (AUTHOR) paulabhishek.res@gmail.com, Sharma, Ranjan1 (AUTHOR) rsharma@associates.iucaa.in, Chanda, Samstuti1 (AUTHOR) schanda93.dta@gmail.com |
| Source: | Modern Physics Letters A. 6/28/2026, Vol. 41 Issue 20, p1-22. 22p. |
| Subjects: | Compact objects (Astronomy), Stellar structure, Anisotropy |
| Abstract: | Motivation: Motivated by the growing interest in understanding the role of non-metricity in describing dense stellar systems, in this paper, we study compact stellar configurations within the framework of linear f (Q) gravity. Methodology: By adopting a linear modification of the form f (Q) = α Q + β , we analyze the internal structure and physical properties of an anisotropic relativistic star within the framework of f (Q) gravity. We employ Karmarkar's condition together with the Vaidya–Tikekar metric ansatz to obtain a closed-form interior solution of the star. The interior solution is then matched to the Schwarzschild exterior solution across the boundary of the star. By varying the model parameters, we analyze physical features of the resultant stellar configuration. Results: We note distinctive features in the density, pressure, anisotropy and total mass of the star under such modification. By enforcing the condition that the central pressure remains finite, we obtain the maximum compactness bound which is shown to depend solely on the Vaidya–Tikekar curvature parameter K. We recover the Buchdahl bound for the curvature parameter K = 0 , which corresponds to the solution for an isotropic and homogeneous fluid sphere. Utilizing the energy density and radial pressure profiles, we numerically integrate the modified Tolman–Oppenheimer–Volkoff equations and obtain the mass–radius (M − R) relationships for different values of the model parameter α. We note that for higher values of α , the maximum mass and radius decrease, shifting the stable branch towards ultra-compact configurations. An interesting observation in our analysis is that a linearly modified f (Q) gravity model can support comparatively low mass stars. Utilizing the observed mass of the pulsar X T E J 1 8 1 4 − 3 3 8 , we demonstrate how our model can be used to fine-tune the radius of the star. [ABSTRACT FROM AUTHOR] |
| Copyright of Modern Physics Letters A 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.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 194403767 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Physical properties and the maximum compactness bound of a class of compact stars in f(Q) gravity. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ghosh%2C+Arpita%22">Ghosh, Arpita</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> arpitaghosh92727@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Paul%2C+Abhishek%22">Paul, Abhishek</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> paulabhishek.res@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Sharma%2C+Ranjan%22">Sharma, Ranjan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rsharma@associates.iucaa.in</i><br /><searchLink fieldCode="AR" term="%22Chanda%2C+Samstuti%22">Chanda, Samstuti</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> schanda93.dta@gmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Modern+Physics+Letters+A%22">Modern Physics Letters A</searchLink>. 6/28/2026, Vol. 41 Issue 20, p1-22. 22p. – Name: Subject Label: Subjects Group: Su 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="%22Anisotropy%22">Anisotropy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Motivation: Motivated by the growing interest in understanding the role of non-metricity in describing dense stellar systems, in this paper, we study compact stellar configurations within the framework of linear f (Q) gravity. Methodology: By adopting a linear modification of the form f (Q) = α Q + β , we analyze the internal structure and physical properties of an anisotropic relativistic star within the framework of f (Q) gravity. We employ Karmarkar's condition together with the Vaidya–Tikekar metric ansatz to obtain a closed-form interior solution of the star. The interior solution is then matched to the Schwarzschild exterior solution across the boundary of the star. By varying the model parameters, we analyze physical features of the resultant stellar configuration. Results: We note distinctive features in the density, pressure, anisotropy and total mass of the star under such modification. By enforcing the condition that the central pressure remains finite, we obtain the maximum compactness bound which is shown to depend solely on the Vaidya–Tikekar curvature parameter K. We recover the Buchdahl bound for the curvature parameter K = 0 , which corresponds to the solution for an isotropic and homogeneous fluid sphere. Utilizing the energy density and radial pressure profiles, we numerically integrate the modified Tolman–Oppenheimer–Volkoff equations and obtain the mass–radius (M − R) relationships for different values of the model parameter α. We note that for higher values of α , the maximum mass and radius decrease, shifting the stable branch towards ultra-compact configurations. An interesting observation in our analysis is that a linearly modified f (Q) gravity model can support comparatively low mass stars. Utilizing the observed mass of the pulsar X T E J 1 8 1 4 − 3 3 8 , we demonstrate how our model can be used to fine-tune the radius of the star. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Modern Physics Letters A 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: BibEntity: Identifiers: – Type: doi Value: 10.1142/S0217732326500987 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 1 Subjects: – SubjectFull: Compact objects (Astronomy) Type: general – SubjectFull: Stellar structure Type: general – SubjectFull: Anisotropy Type: general Titles: – TitleFull: Physical properties and the maximum compactness bound of a class of compact stars in f(Q) gravity. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ghosh, Arpita – PersonEntity: Name: NameFull: Paul, Abhishek – PersonEntity: Name: NameFull: Sharma, Ranjan – PersonEntity: Name: NameFull: Chanda, Samstuti IsPartOfRelationships: – BibEntity: Dates: – D: 28 M: 06 Text: 6/28/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 02177323 Numbering: – Type: volume Value: 41 – Type: issue Value: 20 Titles: – TitleFull: Modern Physics Letters A Type: main |
| ResultId | 1 |
