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Dark stars powered by self-interacting dark matter
Univ Michigan, Leinweber Ctr Theoret Phys, Dept Phys, Ann Arbor, MI 48109 USA..
Stanford Univ, Stanford Inst Theoret Phys, Stanford, CA 94305 USA..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Texas, Dept Phys, Austin, TX 78712 USA.;Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Dept Phys, AlbaNova, Roslagstullsbacken 21, S-10691 Stockholm, Sweden.;Stockholm Univ, .ORCID iD: 0000-0001-9490-020x
Tsung Dao Lee Inst TDLI, 520 Shengrong Rd, Shanghai 201210, Peoples R China.;Shanghai Jiao Tong Univ, Sch Phys & Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China..
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2022 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 106, no 4, article id 043028Article in journal (Refereed) Published
Abstract [en]

Dark matter annihilation might power the first luminous stars in the Universe. These types of stars, known as dark stars, could form in (10(6)-10(8)) M-? protohalos at redshifts z similar to 20, and they could be much more luminous and larger in size than ordinary stars powered by nuclear fusion. We investigate the formation of dark stars in the self-interacting dark matter (SIDM) scenario. We present a concrete particle physics model of SIDM that can simultaneously give rise to the observed dark matter density, satisfy constraints from astrophysical and terrestrial searches, and address the various small-scale problems of collisionless dark matter via the self-interactions. In this model, the power from dark matter annihilation is deposited in the baryonic gas in environments where dark stars could form. We further study the evolution of SIDM density profiles in the protohalos at z similar to 20. As the baryon cloud collapses due to the various cooling processes, the deepening gravitational potential can speed up gravothermal evolution of the SIDM halo, yielding sufficiently high dark matter densities for dark stars to form. We find that SIDM-powered dark stars can have similar properties, such as their luminosity and size, as dark stars predicted in collisionless dark matter models.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 106, no 4, article id 043028
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-320483DOI: 10.1103/PhysRevD.106.043028ISI: 000863061400007Scopus ID: 2-s2.0-85137278637OAI: oai:DiVA.org:kth-320483DiVA, id: diva2:1706361
Note

QC 20221026

Available from: 2022-10-26 Created: 2022-10-26 Last updated: 2022-10-27Bibliographically approved

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Freese, Katherine

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