A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827

Taylor, Peter L.; Massey, Richard; Jauzac, Mathilde; Courbin, F.; Harvey, David; Joseph, R.; Robertson, Andrew

doi:10.1093/mnras/stx855

Cited by 17 publications

(19 citation statements)

References 35 publications

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“…If interpreted solely as an effect of DM self-interaction, it was argued to imply a non-vanishing σ/m of the order of 10 −4 cm 2 /g [197]. However, these results have been reinterpreted using an improved kinematical analysis, obtaining σ/m ∼ 1.5 cm 2 /g in the case of contact interactions [198,199]. The DM substructure observed in Abell 520 [200,201], coincident with the hot gas and not hosting any stars, has been interpreted as suggestive of self-interacting DM in Refs.…”

Section: Dark Matter Self-interactionsmentioning

confidence: 99%

The dawn of FIMP Dark Matter: A review of models and constraints

Bernal

Heikinheimo

Tenkanen

et al. 2017

Int. J. Mod. Phys. A

510

504

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Abstract. We present an overview of scenarios where the observed Dark Matter (DM) abundance consists of Feebly Interacting Massive Particles (FIMPs), produced non-thermally by the so-called freeze-in mechanism. In contrast to the usual freeze-out scenario, frozen-in FIMP DM interacts very weakly with the particles in the visible sector and never attained thermal equilibrium with the baryon-photon fluid in the early Universe. Instead of being determined by its annihilation strength, the DM abundance depends on the decay and annihilation strengths of particles in equilibrium with the baryon-photon fluid, as well as couplings in the DM sector. This makes frozen-in DM very difficult but not impossible to test. In this review, we present the freeze-in mechanism and its variations considered in the literature (dark freeze-out and reannihilation), compare them to the standard DM freeze-out scenario, discuss several aspects of model building, and pay particular attention to observational properties and general testability of such feebly interacting DM.

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Section: Dark Matter Self-interactionsmentioning

confidence: 99%

The dawn of FIMP Dark Matter: A review of models and constraints

Bernal

Heikinheimo

Tenkanen

et al. 2017

Int. J. Mod. Phys. A

510

504

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show abstract

“…Randall et al 2008;Kahlhoefer et al 2015;Robertson et al 2017a) as well as discussions on the size of observed offsets (e.g. Bradač et al 2008;Dawson et al 2012;Dawson 2013;Jee et al 2015;Harvey et al 2017;Peel et al 2017;Taylor et al 2017;Wittman et al 2018). There is also an extensive literature on how the self-interactions affect the merger evolution and under which conditions the picture of a drag force is appropriate (e.g.…”

Section: Equal-mass Mergermentioning

confidence: 99%

N-body simulations of dark matter with frequent self-interactions

Fischer

Brüggen

Schmidt-Hoberg

et al. 2021

Monthly Notices of the Royal Astronomical Society

Self Cite

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Self-interacting Dark Matter (SIDM) models have the potential to solve the small-scale problems that arise in the Cold Dark Matter paradigm. Simulations are a powerful tool for studying SIDM in the context of astrophysics, but it is numerically challenging to study differential cross-sections that favour small-angle scattering (as in light-mediator models). Here we present a novel approach to model frequent scattering based on an effective drag force, which we have implemented into the N-body code Gadget-3. In a range of test problems we demonstrate that our implementation accurately models frequent scattering. Our implementation can be used to study differences between SIDM models that predict rare and frequent scattering. We simulate core formation in isolated dark matter haloes, as well as major mergers of galaxy clusters and find that SIDM models with rare and frequent interactions make different predictions. In particular, frequent interactions are able to produce larger offsets between the distribution of galaxies and dark matter in equal-mass mergers.

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“…As well as addressing whether SIDM clusters do exhibit an enhanced diversity over their CDM counterparts (or whether one or both of the Robertson et al (2018) SIDM+baryons clusters were outliers), the presence of stars and gas in these simulations enables the generation of realistic mock data sets that can be used going forward to test existing (e.g. Gnedin & Ostriker 2001;Meneghetti et al 2001;Randall et al 2008;Harvey et al 2015Harvey et al , 2017Taylor et al 2017;Kim et al 2017) or future methods of constraining the SIDM cross-section.…”

Section: Introductionmentioning

confidence: 99%

Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons

Robertson

Harvey

Massey

et al. 2019

Monthly Notices of the Royal Astronomical Society

Self Cite

116

100

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We present BAHAMAS-SIDM, the first large-volume, (400 h −1 Mpc) 3 , cosmological simulations including both self-interacting dark matter (SIDM) and baryonic physics. These simulations are important for two primary reasons: 1) they include the effects of baryons on the dark matter distribution 2) the baryon particles can be used to make mock observables that can be compared directly with observations. As is well known, SIDM haloes are systematically less dense in their centres, and rounder, than CDM haloes. Here we find that that these changes are not reflected in the distribution of gas or stars within galaxy clusters, or in their X-ray luminosities. However, gravitational lensing observables can discriminate between DM models, and we present a menu of tests that future surveys could use to measure the SIDM interaction strength. We ray-trace our simulated galaxy clusters to produce strong lensing maps. Including baryons boosts the lensing strength of clusters that produce no critical curves in SIDM-only simulations. Comparing the Einstein radii of our simulated clusters with those observed in the CLASH survey, we find that σ/m < 1 cm 2 g −1 at velocities around 1000 km s −1 .

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A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827

Cited by 17 publications

References 35 publications

The dawn of FIMP Dark Matter: A review of models and constraints

The dawn of FIMP Dark Matter: A review of models and constraints

N-body simulations of dark matter with frequent self-interactions

Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons

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