White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity
White dwarfs (WDs), as the remnants of low to intermediate-mass stars, provide a unique opportunity to explore the interplay between quantum mechanical degeneracy pressure and gravitational forces under extreme conditions. In this study, we examine the structure and macroscopic properties of WDs wit...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325003429 |
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| author | Juan M.Z. Pretel Takol Tangphati İzzet Sakallı Ayan Banerjee |
| author_facet | Juan M.Z. Pretel Takol Tangphati İzzet Sakallı Ayan Banerjee |
| author_sort | Juan M.Z. Pretel |
| collection | DOAJ |
| description | White dwarfs (WDs), as the remnants of low to intermediate-mass stars, provide a unique opportunity to explore the interplay between quantum mechanical degeneracy pressure and gravitational forces under extreme conditions. In this study, we examine the structure and macroscopic properties of WDs within the framework of 4D Einstein-Gauss-Bonnet (4DEGB) gravity, a modified theory that incorporates higher-order curvature corrections through the Gauss-Bonnet coupling constant α. Using the modified Tolman-Oppenheimer-Volkoff (TOV) equations tailored for 4DEGB gravity, we analyze the hydrostatic equilibrium of WDs modeled with a realistic equation of state (EoS). Our findings reveal that the inclusion of the Gauss-Bonnet (GB) term significantly influences the mass-radius (M−R) relation, allowing for deviations from the Chandrasekhar mass limit. In particular, we observe that such stars become more compact and slightly smaller with the increase of the parameter α. For WDs with |α|≤500km2, the impact of 4DEGB gravity appears to be negligible. However, a larger range for α allows for appreciable changes in the M−R diagram, mainly in the high-central-density region. Furthermore, we explore the role of anisotropic pressures, quantified by the parameter β, on such systems and demonstrate their impact on stability and compactness. For sufficiently large values of |β| keeping negative β with a large and positive α, there exists a second stable branch according to the classical stability criterion dM/dρc>0. These results suggest that anisotropic WDs in 4DEGB gravity exhibit unique characteristics that distinguish them from their general relativistic counterparts, offering a novel testing ground for modified gravity theories in astrophysical settings. |
| format | Article |
| id | doaj-art-c3c73d484d4e41bd87784eaadfb2af47 |
| institution | DOAJ |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-c3c73d484d4e41bd87784eaadfb2af472025-08-20T03:13:04ZengElsevierPhysics Letters B0370-26932025-07-0186613958110.1016/j.physletb.2025.139581White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravityJuan M.Z. Pretel0Takol Tangphati1İzzet Sakallı2Ayan Banerjee3Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150 URCA, Rio de Janeiro CEP 22290-180, RJ, BrazilSchool of Science, Walailak University, Thasala, Nakhon Si Thammarat, 80160, Thailand; Research Center for Theoretical Simulation and Applied Research in Bioscience and Sensing, Walailak University, Thasala, Nakhon Si Thammarat 80160, ThailandPhysics Department, Eastern Mediterranean University, Famagusta 99628, North Cyprus via Mersin 10, Turkey; Corresponding author.Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu–Natal, Private Bag X54001, Durban 4000, South AfricaWhite dwarfs (WDs), as the remnants of low to intermediate-mass stars, provide a unique opportunity to explore the interplay between quantum mechanical degeneracy pressure and gravitational forces under extreme conditions. In this study, we examine the structure and macroscopic properties of WDs within the framework of 4D Einstein-Gauss-Bonnet (4DEGB) gravity, a modified theory that incorporates higher-order curvature corrections through the Gauss-Bonnet coupling constant α. Using the modified Tolman-Oppenheimer-Volkoff (TOV) equations tailored for 4DEGB gravity, we analyze the hydrostatic equilibrium of WDs modeled with a realistic equation of state (EoS). Our findings reveal that the inclusion of the Gauss-Bonnet (GB) term significantly influences the mass-radius (M−R) relation, allowing for deviations from the Chandrasekhar mass limit. In particular, we observe that such stars become more compact and slightly smaller with the increase of the parameter α. For WDs with |α|≤500km2, the impact of 4DEGB gravity appears to be negligible. However, a larger range for α allows for appreciable changes in the M−R diagram, mainly in the high-central-density region. Furthermore, we explore the role of anisotropic pressures, quantified by the parameter β, on such systems and demonstrate their impact on stability and compactness. For sufficiently large values of |β| keeping negative β with a large and positive α, there exists a second stable branch according to the classical stability criterion dM/dρc>0. These results suggest that anisotropic WDs in 4DEGB gravity exhibit unique characteristics that distinguish them from their general relativistic counterparts, offering a novel testing ground for modified gravity theories in astrophysical settings.http://www.sciencedirect.com/science/article/pii/S0370269325003429 |
| spellingShingle | Juan M.Z. Pretel Takol Tangphati İzzet Sakallı Ayan Banerjee White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity Physics Letters B |
| title | White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity |
| title_full | White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity |
| title_fullStr | White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity |
| title_full_unstemmed | White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity |
| title_short | White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity |
| title_sort | white dwarfs in regularized 4d einstein gauss bonnet gravity |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325003429 |
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