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Effects of mirror dark matter on neutron stars
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.ORCID iD: 0000-0001-5662-825X
University of Liège.
2009 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 32, no 5, p. 278-284Article in journal (Refereed) Published
Abstract [en]

If dark matter is made of mirror baryons, they presumably are present in all gravitationally bound structures. Here, we investigate some effects of mirror dark matter on neutron stars and discuss possible observational consequences. The general-relativistic hydrostatic equations are generalized to spherical objects with multiple fluids that interact by gravity. We use the minimal parity-symmetric extension of the standard model, which implies that the microphysics is the same in the two sectors. We find that the mass-radius relation is significantly modified in the presence of a few percent mirror baryons. This effect mimics that of other exotica, e.g., quark matter. In contrast to the common view that the neutron-star equilibrium sequence is unique, we show that it depends on the relative number of mirror baryons to ordinary baryons. It is therefore, history dependent. The critical mass for core collapse, i.e., the process by which neutron stars are created, is modified in the presence of mirror baryons. We calculate the modified Chandrasekhar mass and fit it with a polynomial. A few percent mirror baryons is sufficient to lower the critical mass for core collapse by ... This could allow for the formation of extraordinary compact neutron stars with low mass.

Place, publisher, year, edition, pages
2009. Vol. 32, no 5, p. 278-284
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
URN: urn:nbn:se:ltu:diva-7054DOI: 10.1016/j.astropartphys.2009.09.005ISI: 000272762800005Scopus ID: 2-s2.0-71849117864Local ID: 55e66960-bee7-11de-b769-000ea68e967bOAI: oai:DiVA.org:ltu-7054DiVA, id: diva2:979941
Note
Validerad; 2009; 20091022 (fresan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sandin, Fredrik

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