Dark stars: Gravitational and electromagnetic observables

Andrea Maselli*, Pantelis Pnigouras, Niklas Grønlund Nielsen, Chris Kouvaris, Kostas D. Kokkotas

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Theoretical models of self-interacting dark matter represent a promising answer to a series of open problems within the so-called collisionless cold dark matter paradigm. In case of asymmetric dark matter, self-interactions might facilitate gravitational collapse and potentially lead to the formation of compact objects predominantly made of dark matter. Considering both fermionic and bosonic (scalar φ4) equations of state, we construct the equilibrium structure of rotating dark stars, focusing on their bulk properties and comparing them with baryonic neutron stars. We also show that these dark objects admit the I-Love-Q universal relations, which link their moments of inertia, tidal deformabilities, and quadrupole moments. Finally, we prove that stars built with a dark matter equation of state are not compact enough to mimic black holes in general relativity, thus making them distinguishable in potential events of gravitational interferometers.

Original languageEnglish
Article number023005
JournalPhysical Review D
Volume96
Issue number2
Number of pages14
ISSN2470-0010
DOIs
Publication statusPublished - 2017

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