Gravitation and Cosmology: Perturbation, Phenomenology and Exact Results
Properties of hadrons and nuclei in vacuum and medium based on quarks and gluons
Origin of (Dynamical) Mass in Visible Universe and Hadron Properties in Nuclear ...
| Full text | |
| Author(s): |
Araujo, L. F.
;
Lima, J. A. S.
;
Lugones, G.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 110, n. 4, p. 13-pg., 2024-08-27. |
| Abstract | |
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-ofthe-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 (pv = -Ev). This is characterized by an energy density fraction y = Em/(Em + Ev), 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. (AU) | |
| FAPESP's process: | 11/51676-9 - LLAMA: a mm/submm radiotelescope in the Andes, in collaboration with Argentina |
| Grantee: | Jacques Raymond Daniel Lépine |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 22/02341-9 - Equation of state of matter under extreme conditions: models and applications |
| Grantee: | Germán Lugones |
| Support Opportunities: | Regular Research Grants |