On the cosmic web elongation in fuzzy dark matter cosmologies: Effects on density profiles, shapes, and alignments of haloes

Dome, Tibor; Fialkov, Anastasia; Mocz, Philip; Schäfer, Björn Malte; Boylan-Kolchin, Michael; Vogelsberger, Mark

doi:10.1093/mnras/stac3766

Cited by 12 publications

(11 citation statements)

References 118 publications

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“…Any exponential-like cutoff in the primordial power spectrum at the small-scale end is heavily constrained observationally, cf. Dome et al (2022) for an overview of recent and forecast astrophysical constraints. However, a more reliable verdict on DM scenarios with small-scale cutoffs and mixed DM models is yet to be made.…”

Section: Discussionmentioning

confidence: 99%

“…Sheet-like morphologies are attributed increased importance in the gas dynamics of FDM as well, since massive gas pancakes are predicted to be the sites of first star formation (Kulkarni et al 2022). Note, however, that global mass filling fractions are anisotropyagnostic and by construction gloss over the enhanced matter distribution anisotropies apparent in cFDM cosmologies (Dome et al 2022). Reliable tidal force predictions would necessitate an analysis of anisotropic geometries and are thus beyond the scope of this paper.…”

Section: Mass and Volume Filling Fractionsmentioning

confidence: 97%

“…Here, k 1/2 denotes the half-mode scale of the cFDM model (Marsh 2016). In other words, this behavior is expected as long as the resolution scales ∆x i satisfy 2π/(∆x i ) > k 1/2 , which is naturally the case, however, since the small-scale cutoff in the primordial power spectrum is always resolved in the simulations (Dome et al 2022). This is very much at odds with results from analytical approaches devised to predict the matter distribution in scale-free cosmologies (Klypin et al 2018;Repp & Szapudi 2018a;Uhlemann et al 2020) and thus necessitates improved theories.…”

Section: Overdensity Pdfsmentioning

confidence: 98%

“…FDM simulations are significantly more challenging than CDM simulations as in the densest regions the wavelike matter oscillations can attain high frequencies ω ∝ m −1 λ −2 dB , requiring very fine temporal resolution even for moderate spatial resolution. The simulations we post-process in this work have been described in Dome et al (2022). In short, we impose a cutoff in the primordial power spectrum similar to Ni et al (2019).…”

Section: Cdm and Fdm-like Simulationsmentioning

confidence: 99%

“…This cutoff serves as a proxy for axions generated via vacuum realignment assuming gravitational interactions do not re-thermalise axions. In Dome et al (2022), this proxy for FDM has been termed classical FDM (cFDM). For scales corresponding to wavenumbers k ∼ 0.16 − 80 h Mpc −1 , which we explore here, the dynamical manifestation of FDM -the quantum pressure (fluid formulation, Madelung 1927) -has only small impact on the growth of DM fluctuations (see e.g.…”

Section: Cdm and Fdm-like Simulationsmentioning

confidence: 99%

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Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Dome¹,

Fialkov²,

Sartorio³

et al. 2023

Preprint

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On large cosmological scales, anisotropic gravitational collapse is manifest in the dark cosmic web. Its statistical properties are well known for the standard ΛCDM cosmology, yet become modified for alternative dark matter models such as fuzzy dark matter (FDM). In this work, we assess for the first time the relative importance of cosmic nodes, filaments, walls and voids in a cosmology with small-scale suppression of power such as FDM. By applying the NEXUS+ Multiscale Morphology Filter technique to cosmological N-body simulations of FDM-like cosmologies, we quantify the mass and volume filling fractions of cosmic environments at redshifts z ∼ 3.4 − 5.6 and find that 2D cosmic sheets host a larger share of the matter content of the Universe (∼ 5% increase for the m = 7 × 10 −22 eV model compared to CDM) as the particle mass m is reduced. We find that the suppression of node-, filament-, wall-and void-conditioned halo mass functions at the low-mass end can occur well above the half-mode mass M 1/2 . We show that log overdensity PDFs are more peaked in FDM-like cosmologies with medians shifted to higher values, a result of the suppression of the low overdensity tail as m is reduced. Skewness estimates S 3 of the unconditioned overdensity PDF P(δ) in FDM-like cosmologies are systematically higher than in CDM, more so at high redshift z ∼ 5.5 where the m = 10 −22 eV model differs from CDM by ∼ 2σ. Accordingly, we advocate for the usage of P(δ) as a testbed for constraining FDM and other alternative dark matter models.

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Section: Discussionmentioning

confidence: 99%

Section: Mass and Volume Filling Fractionsmentioning

confidence: 97%

Section: Overdensity Pdfsmentioning

confidence: 98%

Section: Cdm and Fdm-like Simulationsmentioning

confidence: 99%

Section: Cdm and Fdm-like Simulationsmentioning

confidence: 99%

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Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Dome¹,

Fialkov²,

Sartorio³

et al. 2023

Preprint

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Ultra-light axions and the S ₈ tension: joint constraints from the cosmic microwave background and galaxy clustering

Rogers

Hložek

Laguë

et al. 2023

J. Cosmol. Astropart. Phys.

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We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses 10-32 eV ≤ m a ≤ 10-24 eV, by a joint analysis of cosmic microwave background (CMB) and galaxy clustering data — and consider if axions can resolve the tension in inferred values of the matter clustering parameter S 8. We give legacy constraints from Planck 2018 CMB data, improving 2015 limits on the axion density Ωa h 2 by up to a factor of three; CMB data from the Atacama Cosmology Telescope and the South Pole Telescope marginally weaken Planck bounds at m a = 10-25 eV, owing to lower (and theoretically-consistent) gravitational lensing signals. We jointly infer, from Planck CMB and full-shape galaxy power spectrum and bispectrum data from the Baryon Oscillation Spectroscopic Survey (BOSS), that axions are, today, < 10% of the DM for m a ≤ 10-26 eV and < 1% for 10-30 eV ≤ m a ≤ 10-28 eV. BOSS data strengthen limits, in particular at higher m a by probing high-wavenumber modes (k < 0.4h Mpc-1). BOSS alone finds a preference for axions at 2.7σ, for m a = 10-26 eV, but Planck disfavours this result. Nonetheless, axions in a window 10-28 eV ≤ m a ≤ 10-25 eV can improve consistency between CMB and galaxy clustering data, e.g., reducing the S 8 discrepancy from 2.7σ to 1.6σ, since these axions suppress structure growth at the 8h -1 Mpc scales to which S 8 is sensitive. We expect improved constraints with upcoming high-resolution CMB and galaxy lensing and future galaxy clustering data, where we will further assess if axions can restore cosmic concordance.

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Cosmic web dissection in fuzzy dark matter cosmologies

Dome,

Fialkov,

Sartorio

et al. 2023

Monthly Notices of the Royal Astronomical Society

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On large cosmological scales, anisotropic gravitational collapse is manifest in the dark cosmic web. Its statistical properties are little known for alternative dark matter models such as fuzzy dark matter (FDM). In this work, we assess for the first time the relative importance of cosmic nodes, filaments, walls and voids in a cosmology with primordial small-scale suppression of power. We post-process N-body simulations of FDM-like cosmologies with varying axion mass m at redshifts z ∼ 1.0 − 5.6 using the NEXUS+ Multiscale Morphology Filter technique at smoothing scale Δx = 0.04 h−1Mpc. The formation of wall and void halos is more suppressed than naively expected from the half-mode mass M1/2. Also, we quantify the mass and volume filling fraction of cosmic environments and find that 2D cosmic sheets host a larger share of the matter content of the Universe as m is reduced, with an ∼8 − 12% increase for the m = 7 × 10−22 eV model compared to CDM. We show that in FDM-like cosmologies, filaments, walls and voids are cleaner and more pronounced structures than in CDM, revealed by a strong mid-range peak in the conditioned overdensity PDFs P(δ). At high redshift, low-density regions are more suppressed than high-density regions. Furthermore, skewness estimates S3 of the total overdensity PDF in FDM-like cosmologies are consistently higher than in CDM, especially at high redshift z ∼ 5.6 where the m = 10−22 eV model differs from CDM by ∼6σ. Accordingly, we advocate for the usage of P(δ) as a testbed for constraining FDM and other alternative dark matter models.

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On the cosmic web elongation in fuzzy dark matter cosmologies: Effects on density profiles, shapes, and alignments of haloes

Cited by 12 publications

References 118 publications

Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Ultra-light axions and the S ₈ tension: joint constraints from the cosmic microwave background and galaxy clustering

Cosmic web dissection in fuzzy dark matter cosmologies

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On the cosmic web elongation in fuzzy dark matter cosmologies: Effects on density profiles, shapes, and alignments of haloes

Cited by 12 publications

References 118 publications

Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Cosmic Web Dissection in Fuzzy Dark Matter Cosmologies

Ultra-light axions and the S 8 tension: joint constraints from the cosmic microwave background and galaxy clustering

Cosmic web dissection in fuzzy dark matter cosmologies

Contact Info

Product

Resources

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Ultra-light axions and the S ₈ tension: joint constraints from the cosmic microwave background and galaxy clustering