A novel solution to the hyperon-puzzle in neutron stars
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909105109598208 |
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| author | Chorozidou, A. Gaitanos, T. |
| author_facet | Chorozidou, A. Gaitanos, T. |
| contents | Neutron stars offer a great opportunity to study highly compressed hadronic matter experimentally and theoretically. However, the so-called hyperon-puzzle arises at neutron star densities. The hyperon coexistence with other particles in compressed matter softens the equation of state and many widely-accepted models fail to reproduce precise observations of large neutron star masses. Here, we propose a novel mechanism to retain the stiffness of the high density state with hyperons by considering the explicit momentum dependence of their in-medium potentials. Our approach modifies conventional strangeness threshold conditions and generates new threshold effects on hyperons in high-density matter. We demonstrate these effects within the Non-Linear Derivative model, which incorporates baryon momentum-dependent fields based on empirical and microscopic studies. It turns out that even soft momentum-dependent strangeness fields do prohibit their populations in neutron star matter. The generic momentum dependence of strangeness potentials, as modeled by the non-linear derivative approach, is crucial for resolving the long-standing hyperon-puzzle in neutron stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_08329 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A novel solution to the hyperon-puzzle in neutron stars Chorozidou, A. Gaitanos, T. Nuclear Theory Neutron stars offer a great opportunity to study highly compressed hadronic matter experimentally and theoretically. However, the so-called hyperon-puzzle arises at neutron star densities. The hyperon coexistence with other particles in compressed matter softens the equation of state and many widely-accepted models fail to reproduce precise observations of large neutron star masses. Here, we propose a novel mechanism to retain the stiffness of the high density state with hyperons by considering the explicit momentum dependence of their in-medium potentials. Our approach modifies conventional strangeness threshold conditions and generates new threshold effects on hyperons in high-density matter. We demonstrate these effects within the Non-Linear Derivative model, which incorporates baryon momentum-dependent fields based on empirical and microscopic studies. It turns out that even soft momentum-dependent strangeness fields do prohibit their populations in neutron star matter. The generic momentum dependence of strangeness potentials, as modeled by the non-linear derivative approach, is crucial for resolving the long-standing hyperon-puzzle in neutron stars. |
| title | A novel solution to the hyperon-puzzle in neutron stars |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2402.08329 |