Hints, neutrino bounds, and WDM constraints from SDSS DR14 Lyman-α and Planck full-survey data

Palanque-Delabrouille, N.; Yèche, Ch; Schöneberg, Nils; Lesgourgues, Julien; Walther, Michael; Chabanier, Solène; Armengaud, E.

doi:10.1088/1475-7516/2020/04/038

Cited by 238 publications

(237 citation statements)

References 88 publications

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“…Second, we model the simulated flux power spectra using a Bayesianoptimized Gaussian process emulator, which explicitly tests for convergence in parameter estimation with respect to the accuracy of the emulator model [32,33,38]. This contrasts with previous simulation interpolation methods [e. g., 29,36,37] which have relied on a Taylor expansion around a fiducial point and which we have shown in prior work can bias power spectrum estimation and weaken parameter constraints [33].…”

Section: Max Posterior Datamentioning

confidence: 99%

Strong Bound on Canonical Ultralight Axion Dark Matter from the Lyman-Alpha Forest

2021

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We present a new bound on the ultra-light axion (ULA) dark matter mass ma, using the Lymanalpha forest to look for suppressed cosmic structure growth: a 95% lower limit ma > 2 × 10 −20 eV. This strongly disfavors (> 99.7% credibility) the canonical ULA with 10 −22 eV < ma < 10 −21 eV, motivated by the string axiverse and solutions to possible tensions in the cold dark matter model. We strengthen previous equivalent bounds by about an order of magnitude. We demonstrate the robustness of our results using an optimized emulator of improved hydrodynamical simulations.

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Section: Max Posterior Datamentioning

confidence: 99%

Strong Bound on Canonical Ultralight Axion Dark Matter from the Lyman-Alpha Forest

2021

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“…• Lyman-forest constraints -Warm dark matter suppresses the growth of structure at small scales, yet all observations of the Lyman-forest appear to be compatible with the expectations of cold dark matter -see e.g. (Efstathiou et al 2000;Viel et al 2013;Garzilli et al 2019a;Palanque-Delabrouille et al 2020).…”

Section: Introductionmentioning

confidence: 94%

New constraints on the mass of fermionic dark matter from dwarf spheroidal galaxies

Alvey

Tiki

Blas

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, revise and improve upon previous phase-space considerations to obtain lower bounds on the mass of fermionic dark matter particles. The refinement in the results compared to previous works is realised particularly due to a significantly improved Jeans analysis of the galaxies. We discuss two methods to obtain phase-space bounds on the dark matter mass, one model-independent bound based on Pauli’s principle, and the other derived from an application of Liouville’s theorem. As benchmark examples for the latter case, we derive constraints for thermally decoupled particles and (non-)resonantly produced sterile neutrinos. Using the Pauli principle, we report a model-independent lower bound of m ≥ 0.18 keV at 68% CL and m ≥ 0.13 keV at 95% CL. For relativistically decoupled thermal relics, this bound is strengthened to m ≥ 0.59 keV at 68% CL and m ≥ 0.41 keV at 95% CL, whilst for non-resonantly produced sterile neutrinos the constraint is m ≥ 2.80 keV at 68% CL and m ≥ 1.74 keV at 95% CL. Finally, the phase-space bounds on resonantly produced sterile neutrinos are compared with complementary limits from X-ray, Lyman-α and Big Bang Nucleosynthesis observations.

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“…These scales correspond to the region probed by the Lyman‐ α forest observation of distant quasars (Boera et al 2019). The Lyman‐ α constraint on WDM is precisely m WDM ≳ keV (Garzilli et al 2019; Palanque‐Delabrouille et al 2020; Viel et al 2005).…”

Section: Constraining Out‐of‐equilibrium Dark Mattermentioning

confidence: 99%

Reheating and dark matter production

García

2021

Astron Nachr

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A concise summary of out-of-equilibrium dark matter production during post-inflationary reheating is presented. We show that the dark matter relic abundance is in general sensitive to the thermalization rate of the inflaton decay products, and the evolution of the temperature of the subsequently thermalized radiation. We discuss how smoking-gun signals, such as monochromatic neutrinos or gamma-ray lines, or Lyman-α data, can help constrain out-of-equilibrium DM models.

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Hints, neutrino bounds, and WDM constraints from SDSS DR14 Lyman-α and Planck full-survey data

Cited by 238 publications

References 88 publications

Strong Bound on Canonical Ultralight Axion Dark Matter from the Lyman-Alpha Forest

Strong Bound on Canonical Ultralight Axion Dark Matter from the Lyman-Alpha Forest

New constraints on the mass of fermionic dark matter from dwarf spheroidal galaxies

Reheating and dark matter production

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