Impact of dark energy on the structure of neutron stars: The vacuum case
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| Format: | Preprint |
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2024
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| _version_ | 1866909277662216192 |
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| author | Araujo, L. F. Lima, J. A. S. Lugones, G. |
| author_facet | Araujo, L. F. Lima, J. A. S. Lugones, G. |
| contents | The potential role of a cosmic vacuum dark component in the properties of neutron stars is investigated. It is assumed that the static, spherically symmetric distribution of matter within neutron stars is supported by two distinct components: ordinary matter and a vacuum fluid. For normal matter we use a set of state-of-the-art nuclear matter equations of state, each grounded in nuclear physics experiments. The vacuum energy component is inhomogeneously distributed within the star and obeys the standard equation of state ($p_v = -ε_v$). This is characterized by an energy density fraction $y = ε_m/ (ε_m + ε_v)$, which we model as either a constant or radius-dependent. Our findings reveal that the inclusion of vacuum energy significantly affects the mass-radius relationships in neutron stars, influencing both the maximum achievable masses and the qualitative form of these relationships. Some constraints from current multimessenger observational data limiting the amount of vacuum energy within neutron stars are also discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_01006 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Impact of dark energy on the structure of neutron stars: The vacuum case Araujo, L. F. Lima, J. A. S. Lugones, G. High Energy Physics - Phenomenology High Energy Astrophysical Phenomena Solar and Stellar Astrophysics General Relativity and Quantum Cosmology Nuclear Theory The potential role of a cosmic vacuum dark component in the properties of neutron stars is investigated. It is assumed that the static, spherically symmetric distribution of matter within neutron stars is supported by two distinct components: ordinary matter and a vacuum fluid. For normal matter we use a set of state-of-the-art nuclear matter equations of state, each grounded in nuclear physics experiments. The vacuum energy component is inhomogeneously distributed within the star and obeys the standard equation of state ($p_v = -ε_v$). This is characterized by an energy density fraction $y = ε_m/ (ε_m + ε_v)$, which we model as either a constant or radius-dependent. Our findings reveal that the inclusion of vacuum energy significantly affects the mass-radius relationships in neutron stars, influencing both the maximum achievable masses and the qualitative form of these relationships. Some constraints from current multimessenger observational data limiting the amount of vacuum energy within neutron stars are also discussed. |
| title | Impact of dark energy on the structure of neutron stars: The vacuum case |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena Solar and Stellar Astrophysics General Relativity and Quantum Cosmology Nuclear Theory |
| url | https://arxiv.org/abs/2408.01006 |