Bayesian inference of neutron star properties in f(Q) gravity using NICER observations.
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| Title: | Bayesian inference of neutron star properties in f(Q) gravity using NICER observations. |
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| Authors: | Pradhan, Sneha1 (AUTHOR) snehapradhan2211@gmail.com, Patra, N. K.2 (AUTHOR) nareshkumarpatra@cuhk.edu.cn, Zhou, Kai2,3 (AUTHOR) zhoukai@cuhk.edu.cn, Sahoo, P. K.1 (AUTHOR) pksahoo@hyderabad.bits-pilani.ac.in |
| Source: | European Physical Journal C -- Particles & Fields. Jun2026, Vol. 86 Issue 6, p1-16. 16p. |
| Subjects: | Neutron stars, Bayesian analysis, X-ray astronomy, Equations of state, Gravitation |
| Abstract: | In this work, we investigate neutron stars (NSs) in the strong field regime within the framework of symmetric teleparallel f(Q) gravity, considering three representative models: linear, logarithmic, and exponential. While Bayesian studies of NS observations are well established in general relativity and curvature based modified gravity theories, such analyses in f(Q) gravity remain largely unexplored. For the first time we perform a Bayesian inference analysis by confronting theoretical NS mass-radius predictions with NICER observations of PSR J0030+0451, PSR J0740+6620, PSR J0437+4715, and PSR J0614+3329 in the background of nonmetricity based gravity. The dense matter equation of state is fixed to DDME2 in order to isolate the effects of modified gravity on NS structure. Our results indicate a statistical preference for the exponential f(Q) model over the linear and logarithmic cases, as supported by the Bayes-factor analysis, and show that its parameters are comparatively well constrained. For this model, we obtain a radius and tidal deformability at 1.4 M ⊙ of R 1.4 = 11. 27 - 0.36 + 0.53 km and Λ 1.4 = 156. 95 - 41.73 + 84.02 , respectively, consistent with current observational constraints. The median values of the maximum mass are found to be around M max ≈ 2.3 M ⊙ for all three constrained models. However, the upper parts of the 95% credible regions of the mass-radius relations extend beyond 2.5 M ⊙ and approach ∼ 3 M ⊙ within the adopted framework. This indicates the possibility of comparatively massive stable compact configurations in the Bayesian constrained parameter space. These results highlight the potential of NSs as powerful probes of symmetric teleparallel gravity in the strong field regime. We note that these results are conditional on the use of a fixed DDME2 equation of state and the coincident-gauge formulation adopted in this work. [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.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 195411249 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Bayesian inference of neutron star properties in f(Q) gravity using NICER observations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pradhan%2C+Sneha%22">Pradhan, Sneha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> snehapradhan2211@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Patra%2C+N%2E+K%2E%22">Patra, N. K.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> nareshkumarpatra@cuhk.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhou%2C+Kai%22">Zhou, Kai</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> zhoukai@cuhk.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Sahoo%2C+P%2E+K%2E%22">Sahoo, P. K.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> pksahoo@hyderabad.bits-pilani.ac.in</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>. Jun2026, Vol. 86 Issue 6, p1-16. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Neutron+stars%22">Neutron stars</searchLink><br /><searchLink fieldCode="DE" term="%22Bayesian+analysis%22">Bayesian analysis</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+astronomy%22">X-ray astronomy</searchLink><br /><searchLink fieldCode="DE" term="%22Equations+of+state%22">Equations of state</searchLink><br /><searchLink fieldCode="DE" term="%22Gravitation%22">Gravitation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this work, we investigate neutron stars (NSs) in the strong field regime within the framework of symmetric teleparallel f(Q) gravity, considering three representative models: linear, logarithmic, and exponential. While Bayesian studies of NS observations are well established in general relativity and curvature based modified gravity theories, such analyses in f(Q) gravity remain largely unexplored. For the first time we perform a Bayesian inference analysis by confronting theoretical NS mass-radius predictions with NICER observations of PSR J0030+0451, PSR J0740+6620, PSR J0437+4715, and PSR J0614+3329 in the background of nonmetricity based gravity. The dense matter equation of state is fixed to DDME2 in order to isolate the effects of modified gravity on NS structure. Our results indicate a statistical preference for the exponential f(Q) model over the linear and logarithmic cases, as supported by the Bayes-factor analysis, and show that its parameters are comparatively well constrained. For this model, we obtain a radius and tidal deformability at 1.4 M ⊙ of R 1.4 = 11. 27 - 0.36 + 0.53 km and Λ 1.4 = 156. 95 - 41.73 + 84.02 , respectively, consistent with current observational constraints. The median values of the maximum mass are found to be around M max ≈ 2.3 M ⊙ for all three constrained models. However, the upper parts of the 95% credible regions of the mass-radius relations extend beyond 2.5 M ⊙ and approach ∼ 3 M ⊙ within the adopted framework. This indicates the possibility of comparatively massive stable compact configurations in the Bayesian constrained parameter space. These results highlight the potential of NSs as powerful probes of symmetric teleparallel gravity in the strong field regime. We note that these results are conditional on the use of a fixed DDME2 equation of state and the coincident-gauge formulation adopted in this work. [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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1140/epjc/s10052-026-15962-z Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1 Subjects: – SubjectFull: Neutron stars Type: general – SubjectFull: Bayesian analysis Type: general – SubjectFull: X-ray astronomy Type: general – SubjectFull: Equations of state Type: general – SubjectFull: Gravitation Type: general Titles: – TitleFull: Bayesian inference of neutron star properties in f(Q) gravity using NICER observations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pradhan, Sneha – PersonEntity: Name: NameFull: Patra, N. K. – PersonEntity: Name: NameFull: Zhou, Kai – PersonEntity: Name: NameFull: Sahoo, P. K. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 14346044 Numbering: – Type: volume Value: 86 – Type: issue Value: 6 Titles: – TitleFull: European Physical Journal C -- Particles & Fields Type: main |
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