The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars
We investigate the impact of asymmetric fermionic dark matter (DM) on the thermal evolution of neutron stars (NSs), considering a scenario where DM interacts with baryonic matter (BM) through gravity. Employing the two-fluid formalism, our analysis reveals that DM accrued within the NS core exerts a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Particles |
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| Online Access: | https://www.mdpi.com/2571-712X/7/1/10 |
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| author | Edoardo Giangrandi Afonso Ávila Violetta Sagun Oleksii Ivanytskyi Constança Providência |
| author_facet | Edoardo Giangrandi Afonso Ávila Violetta Sagun Oleksii Ivanytskyi Constança Providência |
| author_sort | Edoardo Giangrandi |
| collection | DOAJ |
| description | We investigate the impact of asymmetric fermionic dark matter (DM) on the thermal evolution of neutron stars (NSs), considering a scenario where DM interacts with baryonic matter (BM) through gravity. Employing the two-fluid formalism, our analysis reveals that DM accrued within the NS core exerts an inward gravitational pull on the outer layers composed of BM. This gravitational interaction results in a noticeable increase in baryonic density within the core of the NS. Consequently, it strongly affects the star’s thermal evolution by triggering the early onsets of the direct Urca (DU) processes, causing enhanced neutrino emission and rapid star cooling. Moreover, the photon emission from the star’s surface is modified due to a reduction in radius. We demonstrate the effect of DM gravitational pull on nucleonic and hyperonic DU processes that become kinematically allowed even for NSs of low mass. We then discuss the significance of observing NSs at various distances from the Galactic center. Given that the DM distribution peaks toward the Galactic center, NSs within this central region are expected to harbor higher fractions of DM, potentially leading to distinct cooling behaviors. |
| first_indexed | 2024-04-24T17:55:52Z |
| format | Article |
| id | doaj.art-29ca4660c2b94667aa89576cab0452b2 |
| institution | Directory Open Access Journal |
| issn | 2571-712X |
| language | English |
| last_indexed | 2024-04-24T17:55:52Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Particles |
| spelling | doaj.art-29ca4660c2b94667aa89576cab0452b22024-03-27T13:58:45ZengMDPI AGParticles2571-712X2024-02-017117920010.3390/particles7010010The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact StarsEdoardo Giangrandi0Afonso Ávila1Violetta Sagun2Oleksii Ivanytskyi3Constança Providência4CFisUC, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, PortugalCFisUC, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, PortugalCFisUC, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, PortugalIncubator of Scientific Excellence—Centre for Simulations of Superdense Fluids, University of Wrocław, 50-204 Wroclaw, PolandCFisUC, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, PortugalWe investigate the impact of asymmetric fermionic dark matter (DM) on the thermal evolution of neutron stars (NSs), considering a scenario where DM interacts with baryonic matter (BM) through gravity. Employing the two-fluid formalism, our analysis reveals that DM accrued within the NS core exerts an inward gravitational pull on the outer layers composed of BM. This gravitational interaction results in a noticeable increase in baryonic density within the core of the NS. Consequently, it strongly affects the star’s thermal evolution by triggering the early onsets of the direct Urca (DU) processes, causing enhanced neutrino emission and rapid star cooling. Moreover, the photon emission from the star’s surface is modified due to a reduction in radius. We demonstrate the effect of DM gravitational pull on nucleonic and hyperonic DU processes that become kinematically allowed even for NSs of low mass. We then discuss the significance of observing NSs at various distances from the Galactic center. Given that the DM distribution peaks toward the Galactic center, NSs within this central region are expected to harbor higher fractions of DM, potentially leading to distinct cooling behaviors.https://www.mdpi.com/2571-712X/7/1/10neutron stardark matterequation of state |
| spellingShingle | Edoardo Giangrandi Afonso Ávila Violetta Sagun Oleksii Ivanytskyi Constança Providência The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars Particles neutron star dark matter equation of state |
| title | The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars |
| title_full | The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars |
| title_fullStr | The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars |
| title_full_unstemmed | The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars |
| title_short | The Impact of Asymmetric Dark Matter on the Thermal Evolution of Nucleonic and Hyperonic Compact Stars |
| title_sort | impact of asymmetric dark matter on the thermal evolution of nucleonic and hyperonic compact stars |
| topic | neutron star dark matter equation of state |
| url | https://www.mdpi.com/2571-712X/7/1/10 |
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