Quark stars in massive gravity might be candidates for the mass gap objects
Abstract We have investigated the structural properties of strange quark stars (SQSs) in a modified theory of gravity known as massive gravity. In order to obtain the equation of state (EOS) of strange quark matter, we have employed a modified version of the Nambu–Jona-Lasinio model (MNJL) which inc...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-02-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-12505-2 |
| _version_ | 1827284137638100992 |
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| author | J. Sedaghat B. Eslam Panah R. Moradi S. M. Zebarjad G. H. Bordbar |
| author_facet | J. Sedaghat B. Eslam Panah R. Moradi S. M. Zebarjad G. H. Bordbar |
| author_sort | J. Sedaghat |
| collection | DOAJ |
| description | Abstract We have investigated the structural properties of strange quark stars (SQSs) in a modified theory of gravity known as massive gravity. In order to obtain the equation of state (EOS) of strange quark matter, we have employed a modified version of the Nambu–Jona-Lasinio model (MNJL) which includes a combination of NJL Lagrangian and its Fierz transformation by using weighting factors $$(1-\alpha )$$ ( 1 - α ) and $$\alpha .$$ α . Additionally, we have also calculated dimensionless tidal deformability $$(\Lambda )$$ ( Λ ) in massive gravity. To constrain the allowed values of the parameters appearing in massive gravity, we have imposed the condition $$\Lambda _{1.4 {M}_{\odot }}\lesssim 580 .$$ Λ 1.4 M ⊙ ≲ 580 . Notably, in the MNJL model, the value of $$\alpha $$ α varies between zero and one. As $$\alpha $$ α increases, the EOS becomes stiffer, and the value of $$\Lambda $$ Λ increases accordingly. We have demonstrated that by softening the EOS with increasing the bag constant, one can obtain objects in massive gravity that not only satisfy the constraint $$\Lambda _{1.4 {M} _{\odot }}\lesssim 580,$$ Λ 1.4 M ⊙ ≲ 580 , but they also fall within the unknown mass gap region $$(2.5{M}_{\odot }-5{M}_{\odot }).$$ ( 2.5 M ⊙ - 5 M ⊙ ) . To establish that the obtained objects in this region are not black holes, we have calculated Schwarzschild radius, compactness, and $$\Lambda _{{M_{TOV}}}$$ Λ M TOV in massive gravity. |
| first_indexed | 2024-03-07T14:44:24Z |
| format | Article |
| id | doaj.art-256844e706c64e55afca6d3e3c92ae58 |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-24T09:49:39Z |
| publishDate | 2024-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-256844e706c64e55afca6d3e3c92ae582024-04-14T11:26:31ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-02-0184211610.1140/epjc/s10052-024-12505-2Quark stars in massive gravity might be candidates for the mass gap objectsJ. Sedaghat0B. Eslam Panah1R. Moradi2S. M. Zebarjad3G. H. Bordbar4Department of Physics, Shiraz UniversityDepartment of Theoretical Physics, Faculty of Science, University of MazandaranKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of SciencesDepartment of Physics, Shiraz UniversityDepartment of Physics, Shiraz UniversityAbstract We have investigated the structural properties of strange quark stars (SQSs) in a modified theory of gravity known as massive gravity. In order to obtain the equation of state (EOS) of strange quark matter, we have employed a modified version of the Nambu–Jona-Lasinio model (MNJL) which includes a combination of NJL Lagrangian and its Fierz transformation by using weighting factors $$(1-\alpha )$$ ( 1 - α ) and $$\alpha .$$ α . Additionally, we have also calculated dimensionless tidal deformability $$(\Lambda )$$ ( Λ ) in massive gravity. To constrain the allowed values of the parameters appearing in massive gravity, we have imposed the condition $$\Lambda _{1.4 {M}_{\odot }}\lesssim 580 .$$ Λ 1.4 M ⊙ ≲ 580 . Notably, in the MNJL model, the value of $$\alpha $$ α varies between zero and one. As $$\alpha $$ α increases, the EOS becomes stiffer, and the value of $$\Lambda $$ Λ increases accordingly. We have demonstrated that by softening the EOS with increasing the bag constant, one can obtain objects in massive gravity that not only satisfy the constraint $$\Lambda _{1.4 {M} _{\odot }}\lesssim 580,$$ Λ 1.4 M ⊙ ≲ 580 , but they also fall within the unknown mass gap region $$(2.5{M}_{\odot }-5{M}_{\odot }).$$ ( 2.5 M ⊙ - 5 M ⊙ ) . To establish that the obtained objects in this region are not black holes, we have calculated Schwarzschild radius, compactness, and $$\Lambda _{{M_{TOV}}}$$ Λ M TOV in massive gravity.https://doi.org/10.1140/epjc/s10052-024-12505-2 |
| spellingShingle | J. Sedaghat B. Eslam Panah R. Moradi S. M. Zebarjad G. H. Bordbar Quark stars in massive gravity might be candidates for the mass gap objects European Physical Journal C: Particles and Fields |
| title | Quark stars in massive gravity might be candidates for the mass gap objects |
| title_full | Quark stars in massive gravity might be candidates for the mass gap objects |
| title_fullStr | Quark stars in massive gravity might be candidates for the mass gap objects |
| title_full_unstemmed | Quark stars in massive gravity might be candidates for the mass gap objects |
| title_short | Quark stars in massive gravity might be candidates for the mass gap objects |
| title_sort | quark stars in massive gravity might be candidates for the mass gap objects |
| url | https://doi.org/10.1140/epjc/s10052-024-12505-2 |
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