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000479234 088__ $$2arXiv$$aarXiv:2205.02243
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000479234 1001_ $$0M.S.Fischer.2$$aFischer, Moritz S.$$b0$$eCorresponding author
000479234 245__ $$aCosmological simulations with rare and frequent dark matter self-interactions
000479234 260__ $$aOxford$$bOxford Univ. Press$$c2022
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000479234 500__ $$a13 pages, 16 figures + appendices, accepted for publication in MNRAS  © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
000479234 520__ $$aDark matter (DM) with self-interactions is a promising solution for the small-scale problems of the standard cosmological model. Here we perform the first cosmological simulation of frequent DM self-interactions, corresponding to small-angle DM scatterings. The focus of our analysis lies in finding and understanding differences to the traditionally assumed rare DM (large-angle) self-scatterings. For this purpose, we compute the distribution of DM densities, the matter power spectrum, the two-point correlation function, and the halo and subhalo mass functions. Furthermore, we investigate the density profiles of the DM haloes and their shapes. We find that overall large-angle and small-angle scatterings behave fairly similarly with a few exceptions. In particular, the number of satellites is considerably suppressed for frequent compared to rare self-interactions with the same cross-section. Overall, we observe that while differences between the two cases may be difficult to establish using a single measure, the degeneracy may be broken through a combination of multiple ones. For instance, the combination of satellite counts with halo density or shape profiles could allow discriminating between rare and frequent self-interactions. As a by-product of our analysis, we provide – for the first time – upper limits on the cross-section for frequent self-interactions.
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000479234 650_7 $$2INSPIRE$$adark matter: density
000479234 650_7 $$2INSPIRE$$ascattering: small-angle
000479234 650_7 $$2INSPIRE$$adark matter: halo
000479234 650_7 $$2INSPIRE$$amatter: power spectrum
000479234 650_7 $$2INSPIRE$$adark matter: scattering
000479234 650_7 $$2INSPIRE$$ahalo: density
000479234 650_7 $$2INSPIRE$$asatellite
000479234 650_7 $$2INSPIRE$$awide-angle
000479234 650_7 $$2INSPIRE$$acorrelation function
000479234 650_7 $$2INSPIRE$$asuppression
000479234 650_7 $$2INSPIRE$$acosmological model
000479234 650_7 $$2INSPIRE$$adark matter: interaction
000479234 650_7 $$2INSPIRE$$aself-force
000479234 650_7 $$2INSPIRE$$atwo-point function
000479234 650_7 $$2INSPIRE$$anumerical calculations
000479234 650_7 $$2autogen$$aastroparticle physics
000479234 650_7 $$2autogen$$amethods: numerical
000479234 650_7 $$2autogen$$agalaxies: haloes
000479234 650_7 $$2autogen$$adark matter
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000479234 7001_ $$0M.Brueggen.1$$aBrüggen, Marcus$$b1
000479234 7001_ $$0P:(DE-H253)PIP1022003$$aSchmidt-Hoberg, Kai$$b2
000479234 7001_ $$0K.Dolag.1$$aDolag, Klaus$$b3
000479234 7001_ $$aKahlhoefer, Felix$$b4
000479234 7001_ $$0A.Ragagnin.1$$aRagagnin, Antonio$$b5
000479234 7001_ $$0A.Robertson.5$$aRobertson, Andrew$$b6
000479234 773__ $$0PERI:(DE-600)2016084-7$$a10.1093/mnras/stac2207$$gVol. 516, no. 2, p. 1923 - 1940$$n2$$p1923 - 1940$$tMonthly notices of the Royal Astronomical Society$$v516$$x0035-8711$$y2022
000479234 7870_ $$0PUBDB-2022-01926$$aFischer, Moritz S. et.al.$$d2022$$iIsParent$$rDESY-22-072 ; arXiv:2205.02243$$tCosmological simulations with rare and frequent dark matter self-interactions
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