Cold dark matter
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<i>Planck</i> 2018 results Open
We present cosmological parameter results from the final full-mission Planck measurements of the cosmic microwave background (CMB) anisotropies, combining information from the temperature and polarization maps and the lensing reconstructio…
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First results from the IllustrisTNG simulations: matter and galaxy clustering Open
Hydrodynamical simulations of galaxy formation have now reached sufficient volume to make precision predictions for clustering on cosmologically relevant scales. Here, we use our new IllustrisTNG simulations to study the non-linear correla…
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Small-Scale Challenges to the <b><i>Λ</i></b>CDM Paradigm Open
The dark energy plus cold dark matter (ΛCDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of the Universe and its evolution with time. Yet on length scales smaller …
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The Dark Energy Survey: more than dark energy – an overview Open
This overview paper describes the legacy prospect and discovery potential of the Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from the DES early data. DES is using a wide-field camera (DECam) on the 4…
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New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman- forest data Open
We present new measurements of the free-streaming of warm dark matter (WDM) from Lyman-α flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100 sample observed with the X-shooter spectrograph (z = 3 – 4.2)…
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First Constraints on Fuzzy Dark Matter from Lyman- Forest Data and Hydrodynamical Simulations Open
We present constraints on the masses of extremely light bosons dubbed fuzzy dark matter (FDM) from Lyman-$\alpha$ forest data. Extremely light bosons with a de Broglie wavelength of ~ 1 kpc have been suggested as dark matter candidates tha…
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The mass–concentration–redshift relation of cold and warm dark matter haloes Open
We use a suite of cosmological simulations to study the mass–concentration–redshift relation, c(M, z), of dark matter haloes. Our simulations include standard Λ-cold dark matter (CDM) models, and additional runs with truncated power spectr…
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Galaxy formation with BECDM – I. Turbulence and relaxation of idealized haloes Open
We present a theoretical analysis of some unexplored aspects of relaxed Bose-Einstein condensate dark matter (BECDM) haloes. This type of ultralight bosonic scalar field dark matter is a viable alternative to the standard cold dark matter …
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NIHAO – IV: core creation and destruction in dark matter density profiles across cosmic time Open
We use the NIHAO (Numerical Investigation of Hundred Astrophysical Objects) cosmological simulations to investigate the effects of baryonic physics on the time evolution of dark matter central density profiles. The sample is made of ≈70 in…
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Constraining the mass of light bosonic dark matter using SDSS Lyman-α forest Open
If a significant fraction of the dark matter in the Universe is made of an\nultra-light scalar field, named fuzzy dark matter (FDM) with a mass $m_a$ of\nthe order of $10^{-22}-10^{-21}$ eV, then its de Broglie wavelength is large\nenough …
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Does the Hubble constant tension call for new physics? Open
The $\\Lambda$ Cold Dark Matter model ($\\Lambda$CDM) represents the current\nstandard model in cosmology. Within this, there is a tension between the value\nof the Hubble constant, $H_0$, inferred from local distance indicators and the\na…
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ETHOS – an effective theory of structure formation: dark matter physics as a possible explanation of the small-scale CDM problems Open
We present the first simulations within an effective theory of structure formation (ETHOS), which includes the effect of interactions between dark matter and dark radiation on the linear initial power spectrum and dark matter self-interact…
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Self-Interacting Dark Matter Can Explain Diverse Galactic Rotation Curves Open
The rotation curves of spiral galaxies exhibit a diversity that has been difficult to understand in the cold dark matter (CDM) paradigm. We show that the self-interacting dark matter (SIDM) model provides excellent fits to the rotation cur…
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Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces Open
We present an accurate non-linear matter power spectrum prediction scheme for\na variety of extensions to the standard cosmological paradigm, which uses the\ntuned halo model previously developed in Mead (2015b). We consider dark energy\nm…
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Missing Satellites Problem: Completeness Corrections to the Number of Satellite Galaxies in the Milky Way are Consistent with Cold Dark Matter Predictions Open
A critical challenge to the cold dark matter (CDM) paradigm is that there are fewer satellites observed around the Milky Way than found in simulations of dark matter substructure. We show that there is a match between the observed satellit…
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Dark matter heats up in dwarf galaxies Open
Gravitational potential fluctuations driven by bursty star formation can kinematically 'heat up' dark matter at the centres of dwarf galaxies. A key prediction of such models is that, at a fixed dark matter halo mass, dwarfs with a higher …
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The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: modelling the clustering and halo occupation distribution of BOSS CMASS galaxies in the Final Data Release Open
Citation: Rodriguez-Torres, S. A., Chuang, C. H., Prada, F., Guo, H., Klypin, A., Behroozi, P., . . . Thomas, D. (2016). The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: modelling the clustering and halo …
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Strong Constraints on Fuzzy Dark Matter from Ultrafaint Dwarf Galaxy Eridanus II Open
The fuzzy dark matter (FDM) model treats DM as a bosonic field with an astrophysically large de Broglie wavelength. A striking feature of this model is O(1) fluctuations in the dark matter density on time scales which are shorter than the …
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Understanding the shape and diversity of dwarf galaxy rotation curves in ΛCDM Open
The shape and diversity of dwarf galaxy rotation curves is at apparent odds with dark matter halos in a Λ Cold Dark Matter (ΛCDM) cosmology. We use mock data from isolated dwarf galaxy simulations to show that this owes to three main effec…
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The evidence for a spatially flat Universe Open
We use a new and statistically powerful Planck likelihood to show that the Planck temperature and polarization spectra are consistent with a spatially flat Universe, in contrast to recent claims in the literature. When combined with other …
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The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2 Open
We report the discovery of a Milky Way satellite in the constellation of Antlia. The Antlia 2 dwarf galaxy is located behind the Galactic disc at a latitude of b ∼ 11° and spans 1.26°, which corresponds to ∼2.9 kpc at its distance of 130 k…
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Early seeds of axion miniclusters Open
We study the small scale structure of axion dark matter in the post-inflationary scenario, which predicts the formation of low-mass, high density clumps of gravitationally bound axions called axion miniclusters. To this end we follow numer…
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The impact of baryons on the matter power spectrum from the Horizon-AGN cosmological hydrodynamical simulation Open
International audience
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SHARP – VII. New constraints on the dark matter free-streaming properties and substructure abundance from gravitationally lensed quasars Open
We present an analysis of seven strongly gravitationally lensed quasars and the corresponding constraints on the properties of dark matter. Our results are derived by modelling the lensed image positions and flux-ratios using a combination…
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Quantifying baryon effects on the matter power spectrum and the weak lensing shear correlation Open
Feedback processes from baryons are expected to strongly affect weak-lensing observables of current and future cosmological surveys. In this paper we present a new parametrisation of halo profiles based on gas, stellar, and dark matter den…
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A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology Open
Dwarf galaxies move in unexpected ways Massive galaxies like our Milky Way are orbited by satellite dwarf galaxies. Standard cosmological simulations of galaxy formation predict that these satellites should move randomly around their host.…
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Stochastic axion scenario Open
For the minimal QCD axion model it is generally believed that overproduction\nof dark matter constrains the axion mass to be above a certain threshold, or at\nleast that the initial misalignment angle must be tuned if the mass is below\nth…
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The Sherwood simulation suite: overview and data comparisons with the Lyman α forest at redshifts 2 ≤<i>z</i>≤ 5 Open
We introduce a new set of large scale, high resolution hydrodynamical\nsimulations of the intergalactic medium: the Sherwood simulation suite. These\nare performed in volumes 10^3-160^3 h^-3 comoving Mpc^{3}, span almost four\norders of ma…
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Exploring the effects of galaxy formation on matter clustering through a library of simulation power spectra Open
Upcoming weak lensing surveys require a detailed theoretical understanding of the matter power spectrum in order to derive accurate and precise cosmological parameter values. While galaxy formation is known to play an important role, its p…
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Dark radiation and superheavy dark matter from black hole domination Open
If even a relatively small number of black holes were created in the early universe, they will constitute an increasingly large fraction of the total energy density as space expands. It is thus well-motivated to consider scenarios in which…