Exotic Compact Objects with Two Dark Matter Fluids
The generic properties of compact objects made of two different fluids of dark matter are studied in a scale-invariant approach. We investigate compact objects with a core–shell structure, where the two fluids are separated, and with mixed dark matter components, where both dark matter fluids are im...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acb3be |
| _version_ | 1827830921011658752 |
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| author | Marie Cassing Alexander Brisebois Muhammad Azeem Jürgen Schaffner-Bielich |
| author_facet | Marie Cassing Alexander Brisebois Muhammad Azeem Jürgen Schaffner-Bielich |
| author_sort | Marie Cassing |
| collection | DOAJ |
| description | The generic properties of compact objects made of two different fluids of dark matter are studied in a scale-invariant approach. We investigate compact objects with a core–shell structure, where the two fluids are separated, and with mixed dark matter components, where both dark matter fluids are immersed within each other. The constellations considered are combinations of incompressible fluids, free and interacting Fermi gases, and equations of state with a vacuum term, i.e., self-bound dark matter. We find novel features in the mass–radius relations for combined dark matter compact objects, which distinguishes them from compact objects with a single dark matter fluid and compact stars made of ordinary baryonic matter, such as white dwarfs, neutron stars, and quark stars. The maximum compactness of certain combined dark matter stars can reach values up to the causality limit for compact stars but not beyond that limit if causality of the dark matter fluids is ensured. |
| first_indexed | 2024-03-12T04:35:33Z |
| format | Article |
| id | doaj.art-1fbd745290004920bf30fb4a36fb639f |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:35:33Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-1fbd745290004920bf30fb4a36fb639f2023-09-03T09:55:21ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01944213010.3847/1538-4357/acb3beExotic Compact Objects with Two Dark Matter FluidsMarie Cassing0https://orcid.org/0000-0002-0244-2983Alexander Brisebois1https://orcid.org/0000-0002-2909-0877Muhammad Azeem2https://orcid.org/0000-0002-2796-9474Jürgen Schaffner-Bielich3https://orcid.org/0000-0002-0079-6841Institut für Theoretische Physik , Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany ; mcassing@itp.uni-frankfurt.deDivision of Engineering Science, University of Toronto , Toronto, Ontario M5S 2E4, CanadaDepartment of Physics and Astronomy, York University , Toronto, Ontario M3J 1P3, CanadaInstitut für Theoretische Physik , Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany ; mcassing@itp.uni-frankfurt.deThe generic properties of compact objects made of two different fluids of dark matter are studied in a scale-invariant approach. We investigate compact objects with a core–shell structure, where the two fluids are separated, and with mixed dark matter components, where both dark matter fluids are immersed within each other. The constellations considered are combinations of incompressible fluids, free and interacting Fermi gases, and equations of state with a vacuum term, i.e., self-bound dark matter. We find novel features in the mass–radius relations for combined dark matter compact objects, which distinguishes them from compact objects with a single dark matter fluid and compact stars made of ordinary baryonic matter, such as white dwarfs, neutron stars, and quark stars. The maximum compactness of certain combined dark matter stars can reach values up to the causality limit for compact stars but not beyond that limit if causality of the dark matter fluids is ensured.https://doi.org/10.3847/1538-4357/acb3beDark matterCompact objects |
| spellingShingle | Marie Cassing Alexander Brisebois Muhammad Azeem Jürgen Schaffner-Bielich Exotic Compact Objects with Two Dark Matter Fluids The Astrophysical Journal Dark matter Compact objects |
| title | Exotic Compact Objects with Two Dark Matter Fluids |
| title_full | Exotic Compact Objects with Two Dark Matter Fluids |
| title_fullStr | Exotic Compact Objects with Two Dark Matter Fluids |
| title_full_unstemmed | Exotic Compact Objects with Two Dark Matter Fluids |
| title_short | Exotic Compact Objects with Two Dark Matter Fluids |
| title_sort | exotic compact objects with two dark matter fluids |
| topic | Dark matter Compact objects |
| url | https://doi.org/10.3847/1538-4357/acb3be |
| work_keys_str_mv | AT mariecassing exoticcompactobjectswithtwodarkmatterfluids AT alexanderbrisebois exoticcompactobjectswithtwodarkmatterfluids AT muhammadazeem exoticcompactobjectswithtwodarkmatterfluids AT jurgenschaffnerbielich exoticcompactobjectswithtwodarkmatterfluids |