Hyperons in neutron stars.
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| Title: | Hyperons in neutron stars. |
|---|---|
| Authors: | Tretyakova, T.1,2 (AUTHOR) tretyakova@sinp.msu.ru, Lanskoy, D.1 (AUTHOR), Mikheev, S.1,2 (AUTHOR), Nasakin, A.1,2 (AUTHOR) |
| Source: | International Journal of Modern Physics E: Nuclear Physics. May2026, Vol. 35 Issue 5, p1-19. 19p. |
| Subject Terms: | *Neutron stars, *Hyperons, *Equations of state, *Nuclear physics, *Properties of matter, *Hadron interactions, *Skyrme model |
| Abstract: | Neutron stars (NSs) are compact objects with the density of the order of the nuclear density and, accordingly, methods of nuclear physics are effective for describing the NS matter. At the same time, the central density is several times higher than the nuclear density, which leads to the hyperon appearance and allows testing models of both nucleonic and hyperonic interactions under extreme conditions. The appearance of hyperons softens the equation of state (EOS) of the NS matter and decreases the maximum mass, which makes it problematic to achieve the maximum NS mass ∼ 2 M ⊙ in calculations, as required by astrophysical observations. We consider the NS matter in the Skyrme force approximation taking into account Λ and Ξ hyperons. It is shown that the density of the hyperon appearance is of great importance for the maximum NS mass problem. Correlations between the NS characteristics and the properties of baryonic interactions are demonstrated and it is shown that the most important factors are the hyperonic interaction contracting power, as well as the nuclear matter incompressibility and the derivatives of the symmetry energy characterizing the properties of nuclear matter at high densities. A complex combination of nucleonic and hyperonic interaction properties can lead to different orders of appearance of Λ and Ξ − hyperons or their possible absence, depending on the interactions used. The absence of Λ hyperons does not solve the hyperon puzzle, since Ξ hyperons also soften the EOS. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 194092336 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Hyperons in neutron stars. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tretyakova%2C+T%2E%22">Tretyakova, T.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> tretyakova@sinp.msu.ru</i><br /><searchLink fieldCode="AR" term="%22Lanskoy%2C+D%2E%22">Lanskoy, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mikheev%2C+S%2E%22">Mikheev, S.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nasakin%2C+A%2E%22">Nasakin, A.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+E%3A+Nuclear+Physics%22">International Journal of Modern Physics E: Nuclear Physics</searchLink>. May2026, Vol. 35 Issue 5, p1-19. 19p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Neutron+stars%22">Neutron stars</searchLink><br />*<searchLink fieldCode="DE" term="%22Hyperons%22">Hyperons</searchLink><br />*<searchLink fieldCode="DE" term="%22Equations+of+state%22">Equations of state</searchLink><br />*<searchLink fieldCode="DE" term="%22Nuclear+physics%22">Nuclear physics</searchLink><br />*<searchLink fieldCode="DE" term="%22Properties+of+matter%22">Properties of matter</searchLink><br />*<searchLink fieldCode="DE" term="%22Hadron+interactions%22">Hadron interactions</searchLink><br />*<searchLink fieldCode="DE" term="%22Skyrme+model%22">Skyrme model</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Neutron stars (NSs) are compact objects with the density of the order of the nuclear density and, accordingly, methods of nuclear physics are effective for describing the NS matter. At the same time, the central density is several times higher than the nuclear density, which leads to the hyperon appearance and allows testing models of both nucleonic and hyperonic interactions under extreme conditions. The appearance of hyperons softens the equation of state (EOS) of the NS matter and decreases the maximum mass, which makes it problematic to achieve the maximum NS mass ∼ 2 M ⊙ in calculations, as required by astrophysical observations. We consider the NS matter in the Skyrme force approximation taking into account Λ and Ξ hyperons. It is shown that the density of the hyperon appearance is of great importance for the maximum NS mass problem. Correlations between the NS characteristics and the properties of baryonic interactions are demonstrated and it is shown that the most important factors are the hyperonic interaction contracting power, as well as the nuclear matter incompressibility and the derivatives of the symmetry energy characterizing the properties of nuclear matter at high densities. A complex combination of nucleonic and hyperonic interaction properties can lead to different orders of appearance of Λ and Ξ − hyperons or their possible absence, depending on the interactions used. The absence of Λ hyperons does not solve the hyperon puzzle, since Ξ hyperons also soften the EOS. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1142/S0218301326410119 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 1 Subjects: – SubjectFull: Neutron stars Type: general – SubjectFull: Hyperons Type: general – SubjectFull: Equations of state Type: general – SubjectFull: Nuclear physics Type: general – SubjectFull: Properties of matter Type: general – SubjectFull: Hadron interactions Type: general – SubjectFull: Skyrme model Type: general Titles: – TitleFull: Hyperons in neutron stars. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tretyakova, T. – PersonEntity: Name: NameFull: Lanskoy, D. – PersonEntity: Name: NameFull: Mikheev, S. – PersonEntity: Name: NameFull: Nasakin, A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 02183013 Numbering: – Type: volume Value: 35 – Type: issue Value: 5 Titles: – TitleFull: International Journal of Modern Physics E: Nuclear Physics Type: main |
| ResultId | 1 |
