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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2511.18017 |
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| _version_ | 1866915633004806144 |
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| author | Nashed, G. G. L. |
| author_facet | Nashed, G. G. L. |
| contents | In this work we examine the internal structure of compact stars within an extended gravitational framework described by the function $f(\mathcal{R},\mathcal{G},\mathcal{T})$. Throughout this work, the quantity $\mathcal{R}$ refers to the curvature scalar formed from the Ricci tensor. The term $\mathcal{G}$ denotes the Gauss--Bonnet curvature invariant, while $\mathcal{T}$ corresponds to the trace obtained by contracting the matter energy-momentum tensor. Our analysis is directed toward massive radio pulsars with masses above $1.8\,M_{\odot}$, which provide an exceptional testing ground for gravity under conditions inaccessible to laboratory experiments. Adopting the linear form $f(\mathcal{R},\mathcal{G},\mathcal{T})=\mathcal{R}+α\,\mathcal{G}+β\,\mathcal{T}$ where $α$ and $β$ are parameters of suitable dimensionality,\footnote{$α$ has dimensions of $[L^{2}]$ and $β$ carries units of $[N^{-1}]$.} we obtain an exact analytic solution for static anisotropic stellar matter in hydrostatic equilibrium. This solution allows all physical quantities to be expressed in terms of the dimensionless parameters $ α_{1}=α/R^{2},\qquad β_{1}=β/κ^{2}$ together with the compactness $C=2GM/(Rc^{2})$. We constraint the two parameters $α$ and $β$ by matching the model with the mass and radius of pulsar \textit{U1724} requires restricting these parameters to $α_{1}=\pm0.023$ and $β_{1}=\pm0.001$, where $κ^{2}=8πG/c^{4}$ is the standard Einstein coupling. The resulting stellar configuration satisfies the causal bound on the radial sound speed, $c_{s}^{2}<c^{2}/3$, distinguishing it from the corresponding behaviour in general relativity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_18017 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraining linear form of $f(\mathcal{R,G,T})$ gravity from astrophysical observations of the Pulsar U1724 Nashed, G. G. L. General Relativity and Quantum Cosmology Astrophysics of Galaxies High Energy Physics - Theory In this work we examine the internal structure of compact stars within an extended gravitational framework described by the function $f(\mathcal{R},\mathcal{G},\mathcal{T})$. Throughout this work, the quantity $\mathcal{R}$ refers to the curvature scalar formed from the Ricci tensor. The term $\mathcal{G}$ denotes the Gauss--Bonnet curvature invariant, while $\mathcal{T}$ corresponds to the trace obtained by contracting the matter energy-momentum tensor. Our analysis is directed toward massive radio pulsars with masses above $1.8\,M_{\odot}$, which provide an exceptional testing ground for gravity under conditions inaccessible to laboratory experiments. Adopting the linear form $f(\mathcal{R},\mathcal{G},\mathcal{T})=\mathcal{R}+α\,\mathcal{G}+β\,\mathcal{T}$ where $α$ and $β$ are parameters of suitable dimensionality,\footnote{$α$ has dimensions of $[L^{2}]$ and $β$ carries units of $[N^{-1}]$.} we obtain an exact analytic solution for static anisotropic stellar matter in hydrostatic equilibrium. This solution allows all physical quantities to be expressed in terms of the dimensionless parameters $ α_{1}=α/R^{2},\qquad β_{1}=β/κ^{2}$ together with the compactness $C=2GM/(Rc^{2})$. We constraint the two parameters $α$ and $β$ by matching the model with the mass and radius of pulsar \textit{U1724} requires restricting these parameters to $α_{1}=\pm0.023$ and $β_{1}=\pm0.001$, where $κ^{2}=8πG/c^{4}$ is the standard Einstein coupling. The resulting stellar configuration satisfies the causal bound on the radial sound speed, $c_{s}^{2}<c^{2}/3$, distinguishing it from the corresponding behaviour in general relativity. |
| title | Constraining linear form of $f(\mathcal{R,G,T})$ gravity from astrophysical observations of the Pulsar U1724 |
| topic | General Relativity and Quantum Cosmology Astrophysics of Galaxies High Energy Physics - Theory |
| url | https://arxiv.org/abs/2511.18017 |