Constraining Ultra-light Axions with Galaxy Cluster Number Counts

Diehl, Johannes; Weller, Jochen

doi:10.48550/arxiv.2103.08674

Cited by 3 publications

(3 citation statements)

References 122 publications

(125 reference statements)

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“…Dark matter of mass well below this value will not "fit" into dwarf galaxies, inhibiting their growth and unacceptably suppressing the subhalo mass function in conflict with observations [370,371,372]. This may be extended to larger and smaller systems with current and future data [373,374].…”

Section: Extremely Massive and Ultralight Dark Matter Candidatesmentioning

confidence: 92%

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

Gardner,

McDermott,

Yanny

2021

Preprint

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The growing trove of precision astrometric observations from the Gaia space telescope and other surveys is revealing the structure and dynamics of the Milky Way in ever more exquisite detail. We summarize the current status of our understanding of the structure and the characteristics of the Milky Way, and we review the emerging picture: the Milky Way is evolving through interactions with the massive satellite galaxies that stud its volume, with evidence pointing to a cataclysmic past. It is also woven with stellar streams, and observations of streams, satellites, and field stars offer new constraints on its dark matter, both on its spatial distribution and its fundamental nature. The recent years have brought much focus to the study of dwarf galaxies found within our Galaxy's halo and their internal matter distributions. In this review, we focus on the predictions of the cold dark matter paradigm at small mass scales through precision astrometric measurements, and we summarize the modern consensus on the extent to which small-scale probes are consistent with this paradigm. We note the discovery prospects of these studies, and also how they intertwine with probes of the dynamics and evolution of the Milky Way in various and distinct ways.

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Section: Extremely Massive and Ultralight Dark Matter Candidatesmentioning

confidence: 92%

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

Gardner,

McDermott,

Yanny

2021

Preprint

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“…(1.2), we can ask what happens if we relax this assumption and allow multiple axions each composing a fraction of the dark matter. Many studies have been devoted to probing the existence of such particles as a subdominant component [8,9] and any evidence for such a multi-component dark sector would be considered a smoking gun for the string landscape [3].…”

Section: Introductionmentioning

confidence: 99%

Constraining Ultralight Axions with Galaxy Surveys

Laguë,

Bond,

Hložek

et al. 2021

Preprint

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Ultralight axions and other bosons are dark matter candidates present in many high energy physics theories beyond the Standard Model. In particular, the string axiverse postulates the existence of up to O(100) light scalar bosons constituting the dark sector. Considering a mixture of axions and cold dark matter, we obtain upper bounds for the axion relic density Ω a h 2 < 0.004 for axions of mass 10 −31 eV ≤ m a ≤ 10 −26 eV at 95% confidence. We also improve existing constraints by a factor of over 4.5 and 2.1 for axion masses of 10 −25 eV and 10 −32 eV, respectively. We use the Fourier-space galaxy clustering statistics from the Baryon Oscillation Spectroscopic Survey (BOSS) and demonstrate how galaxy surveys break important degeneracies in the axion parameter space compared to the cosmic microwave background (CMB). We test the validity of the effective field theory of large-scale structure approach to mixed ultralight axion dark matter by making our own mock galaxy catalogs and find an anisotropic ultralight axion signature in the galaxy quadrupole. We also observe an enhancement of the linear galaxy bias from 1.8 to 2.4 when allowing for 5% of the dark matter to be composed of a 10 −28 eV axion in our simulations. Finally, we develop an augmented interpolation scheme allowing a fast computation of the axion contribution to the linear matter power spectrum leading to a 70% reduction of the computational cost for the full Monte Carlo Markov chains analysis.

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“…So far, kSZ detections have been made by taking the difference between CMB temperature measurements in the directions of galaxy clusters [29,30,35,52,[138][139][140], probing their pairwise velocities. Clusters (with masses M ∼ 10 14 M ) are the heaviest collapsed objects, and their mass function responds to ULAs [141]. We apply the halo model [142][143][144][145][146][147][148][149][150][151][152][153] to explicitly derive (to our knowledge for the first time in the literature) expressions for cluster pairwise velocities in structure-suppressing scenarios, which differ from those in Refs.…”

Section: Introductionmentioning

confidence: 99%

Ultra-light axions and the kinetic Sunyaev-Zel'dovich Effect

Farren,

Grin,

Jaffe

et al. 2021

Preprint

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Measurements of secondary cosmic microwave background (CMB) anisotropies, such as the Sunyaev-Zel'dovich (SZ) effect, will enable new tests of neutrino and dark sector properties. The kinetic SZ (kSZ) effect is produced by cosmological flows, probing structure growth. Ultra-light axions (ULAs) are a well-motivated dark-matter candidate. Here the impact of ULA dark matter (with mass 10 −27 eV to 10 −23 eV) on kSZ observables is determined, applying new analytic expressions for pairwise cluster velocities and Ostriker-Vishniac signatures in structure-suppressing models. For the future CMB-S4 and ongoing DESI galaxy surveys, the kSZ effect (along with primary anisotropies) will probe ULA fractions ηa = Ωaxion/ΩDM as low as ∼ 5% if ma 10 −27 eV (at 95% C.L.), with sensitivity extending up to ma 10 −25 eV. If reionization and the primary CMB can be adequately modeled, Ostriker-Vishniac measurements could probe values ηa 10 −3 if 10 −27 eV ma 10 −24 eV, or ηa 1 if ma 10 −22 eV, within the fuzzy dark matter window.

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Constraining Ultra-light Axions with Galaxy Cluster Number Counts

Cited by 3 publications

References 122 publications

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

Constraining Ultralight Axions with Galaxy Surveys

Ultra-light axions and the kinetic Sunyaev-Zel'dovich Effect

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