Regular Article – Theoretical Physics
Slowly rotating topological neutron stars: universal relations and epicyclic frequencies
Department of Theoretical Physics, Faculty of Physics, Sofia University, 1164, Sofia, Bulgaria
2 Theoretical Astrophysics, Eberhard Karls University of Tübingen, 72076, Tübingen, Germany
3 INRNE, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria
4 Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street 8, 1113, Sofia, Bulgaria
Accepted: 13 September 2020
Published online: 22 September 2020
In the modern era of abundant X-ray detections and the increasing momentum of gravitational waves astronomy, tests of general relativity in strong field regime become increasingly feasible and their importance for probing gravity cannot be understated. To this end, we study the characteristics of slowly rotating topological neutron stars in the tensor-multi-scalar theories of gravity following the static study of this new type of compact objects by two of the authors. We explore the moment of inertia and verify that universal relations known from general relativity hold for this new class of compact objects. Furthermore, we study the properties of their innermost stable circular orbits and the epicyclic frequencies due to the latter’s hinted link to observational quantities such as quasi-periodic X-ray spectrum features.
© The Author(s) 2020
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