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dc.date.accessioned2020-08-17T18:15:38Z
dc.date.available2020-08-17T18:15:38Z
dc.date.created2020-08-04T00:36:20Z
dc.date.issued2020
dc.identifier.citationHartman, Stian Winther, Hans Arnold Mota, David . Collapse of spherical overdensities in superfluid models of dark matter. Astronomy and Astrophysics. 2020, 639
dc.identifier.urihttp://hdl.handle.net/10852/78432
dc.description.abstractAims. We intend to understand cosmological structure formation within the framework of superfluid models of dark matter with finite temperatures. Of particular interest is the evolution of small-scale structures where the pressure and superfluid properties of the dark matter fluid are prominent. We compare the growth of structures in these models with the standard cold dark matter paradigm and non-superfluid dark matter. Methods. The equations for superfluid hydrodynamics were computed numerically in an expanding ΛCDM background with spherical symmetry; the effect of various superfluid fractions, temperatures, interactions, and masses on the collapse of structures was taken into consideration. We derived the linear perturbation of the superfluid equations, giving further insights into the dynamics of the superfluid collapse. Results. We found that while a conventional dark matter fluid with self-interactions and finite temperatures experiences a suppression in the growth of structures on smaller scales, as expected due to the presence of pressure terms, a superfluid can collapse much more efficiently than was naively expected due to its ability to suppress the growth of entropy perturbations and thus gradients in the thermal pressure. We also found that the cores of the dark matter halos initially become more superfluid during the collapse, but eventually reach a point where the superfluid fraction falls sharply. The formation of superfluid dark matter halos surrounded by a normal fluid dark matter background is therefore disfavored by the present work.
dc.languageEN
dc.titleCollapse of spherical overdensities in superfluid models of dark matter
dc.typeJournal article
dc.creator.authorHartman, Stian
dc.creator.authorWinther, Hans Arnold
dc.creator.authorMota, David
cristin.unitcode185,15,3,0
cristin.unitnameInstitutt for teoretisk astrofysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1821453
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy and Astrophysics&rft.volume=639&rft.spage=&rft.date=2020
dc.identifier.jtitleAstronomy and Astrophysics
dc.identifier.volume639
dc.identifier.pagecount10
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201937263
dc.identifier.urnURN:NBN:no-81561
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0004-6361
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/78432/1/aa37263-19.pdf
dc.type.versionPublishedVersion
cristin.articleidA90
dc.relation.projectNFR/287772
dc.relation.projectNFR/301367


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