Journal
PHYSICS OF THE DARK UNIVERSE
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.dark.2021.100796
Keywords
Neutron stars; Mirror dark matter; Gravitational Waves
Categories
Funding
- Amaldi Research Center - MIUR program Dipartimento di Eccellenza'', Italy [CUP: B81I18001170001]
- Talent Scientific Research Program of College of Physics, China, Sichuan University [1082204112427]
- Shanghai Municipality, China [KBH1512299]
- Fudan University, China [JJH1512105]
- NSFC, China [11875113]
- U.S. National Science Foundation
- French Centre National de Recherche Scientifique (CNRS)
- Italian Istituto Nazionale della Fisica Nucleare (INFN)
- Dutch Nikhef, Italy
- Polish institute
- Hungarian institute
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The presence of mirror dark matter in neutron star interiors affects the maximum mass and tidal deformability, requiring constraints on the amount of dark matter to meet existing limitations. Making assumptions on the amount of dark matter in neutron stars is necessary when using tidal deformability measurements to rule out equations of state.
We inspect the possibility that neutron star interiors are a mixture of ordinary matter and mirror dark matter. This is a scenario that can be naturally envisaged according to well studied accretion mechanisms, including the Bondi-Hoyle one. We show that the inclusion of mirror dark matter in neutron star models lowers the maximum neutron star mass for a given equation of state, and that it decreases the tidal deformability of a given neutron star. These general features imply that, given an equation of state, one can constrain the maximum viable amount of mirror dark matter in neutron stars in order to consistently fulfil existing maximum mass and tidal deformability constraints. Conversely, using tidal deformability measurements to rule out equations of state requires making assumptions on the amount of mirror dark matter contained in neutron stars. Finally, the presence of mirror dark matter also modifies the universal relation that links the tidal deformability of a neutron star to its compactness. Therefore, caution is mandatory when considering exotic models, such as the ones discussed in this paper. (C) 2021 Published by Elsevier B.V.
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