Ruling out 3 keV warm dark matter using 21 cm EDGES data

Chatterjee, Atrideb; Dayal, Pratika; Choudhury, Tirthankar Roy; Hutter, Anne

doi:10.1093/mnras/stz1444

Cited by 46 publications

(45 citation statements)

References 73 publications

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“…For example, Baur et al (2016) found a lower limit of 2.96 keV from observations of the Lyman-alpha forest, while Palanque-Delabrouille et al (2020) placed a lower limit of 5.3 keV (a similar limit is found by Iršič et al (2017)). Chatterjee et al (2019) used high-redshift 21-cm data from EDGES to rule out WDM with m WDM < 3 keV. Note that our limit is less sensitive to details of baryonic physics than the others, because our analysis relies on the cumulative abundance of dark matter halos.…”

Section: Discussionmentioning

confidence: 99%

Virial halo mass function in the ${\it Planck}$ cosmology

Shirasaki,

Ishiyama,

Ando

2021

Preprint

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We study halo mass functions with high-resolution N -body simulations under a ΛCDM cosmology. Our simulations adopt the cosmological model that is consistent with recent measurements of the cosmic microwave backgrounds with the Planck satellite. We calibrate the halo mass functions for 10 8.5 < ∼ M vir /(h −1 M ) < ∼ 10 15.0−0.45 z , where M vir is the virial spherical overdensity mass and redshift z ranges from 0 to 7. The halo mass function in our simulations can be fitted by a four-parameter model over a wide range of halo masses and redshifts, while we require some redshift evolution of the fitting parameters. Our new fitting formula of the mass function has a 5%-level precision except for the highest masses at z ≤ 7. Our model predicts that the analytic prediction in Sheth & Tormen would overestimate the halo abundance at z = 6 with M vir = 10 8.5−10 h −1 M by 20-30%. Our calibrated halo mass function provides a baseline model to constrain warm dark matter (WDM) by high-z galaxy number counts. We compare a cumulative luminosity function of galaxies at z = 6 with the total halo abundance based on our model and a recently proposed WDM correction. We find that WDM with its mass lighter than 2.71 keV is incompatible with the observed galaxy number density at a 2σ confidence level.

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Section: Discussionmentioning

confidence: 99%

Virial halo mass function in the ${\it Planck}$ cosmology

Shirasaki,

Ishiyama,

Ando

2021

Preprint

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“…Observational constraints are often reported in terms of the thermal WDM mass m WDM . The current strongest limits from Lyman-α forest data and redshifted 21 cm signals in EDGES observations [86] are, respectively, m WDM > 5.3 keV [40] and m WDM > 6.1 keV [44,45] (up to a galaxy formation model [46,47]). In the conventional thermal (or early decoupled) WDM model, the WDM temperature is determined such that the thermal relic abundance coincides with the observed DM mass density.…”

Section: Introductionmentioning

confidence: 91%

Constraining FIMP from the structure formation of the Universe: analytic mapping from m_WDM

Kamada

Yanagi

2019

J. Cosmol. Astropart. Phys.

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A feebly interacting massive particle (FIMP), contrasting with a weakly interacting massive particle (WIMP), is an intriguing dark matter (DM) candidate. Light (keV-scale) FIMP DM is of particular interest: its radiative decay leaves a line signal in x-ray spectra; and it is warm dark matter (WDM) and alters the galactic-scale structure formation of the Universe from that with WIMP DM. Once a possible x-ray line is reported (e.g., 3.5 keV line and 7 keV FIMP DM is inferred), one has to check whether or not this FIMP DM is compatible with the structure formation. Here is an issue: the structure formation constraint on WDM is often reported in terms of the so-called thermal WDM mass m WDM , which cannot be directly applied to FIMP parameters. In this paper, we introduce a benchmark FIMP model that represents well a broad class of FIMP models. A big advantage of this benchmark is that we can derive the analytic formula of the non-thermal phase space distribution of FIMPs produced from freezein processes. By further deriving a certain "warmness" quantity, we can analytically map m WDM to FIMP parameters. Our analytic map indicates that 7 keV FIMP DM, without entropy production or a degenerate spectrum, is in tension with the latest Lyman-α forest data. Our analytic map will be very useful for future updates of observational constraints and reports of x-ray lines. It is also very easy to incorporate our analytic formula into a Boltzmann solver so that a linear matter power spectrum is readily accessible. Our benchmark model will facilitate FIMP searches and particle physics model-building. arXiv:1907.04558v1 [hep-ph]

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“…The recent measurement of the 21-cm absortion signal due to the light of the first stars, reported by the EDGES Collaboration [60], can provide lower bounds on the mass of non-cold dark matter candidates. If N 1 is mainly warm, this observation implies roughly m N 1 3 keV [61]. A rigorous approach to the implications of mixed DM in the structure formation may also put bounds on the parameter α [62,63].…”

Section: Jhep10(2021)005mentioning

confidence: 99%

A model for mixed warm and hot right-handed neutrino dark matter

Dutra

Oliveira

Pires

et al. 2021

J. High Energ. Phys.

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We discuss a model where a mixed warm and hot keV neutrino dark matter rises naturally. We arrange active and sterile neutrinos in the same SU(3)L multiplet, with the lightest sterile neutrino being dark matter. The other two heavy sterile neutrinos, through their out-of-equilibrium decay, contribute both to the dilution of dark matter density and its population, after freeze-out. We show that this model features all ingredients to overcome the overproduction of keV neutrino dark matter, and explore the phenomenological implications for Big Bang Nucleosynthesis and the number of relativistic degrees of freedom.

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Ruling out 3 keV warm dark matter using 21 cm EDGES data

Cited by 46 publications

References 73 publications

Virial halo mass function in the ${\it Planck}$ cosmology

Virial halo mass function in the ${\it Planck}$ cosmology

Constraining FIMP from the structure formation of the Universe: analytic mapping from m_WDM

A model for mixed warm and hot right-handed neutrino dark matter

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Ruling out 3 keV warm dark matter using 21 cm EDGES data

Cited by 46 publications

References 73 publications

Virial halo mass function in the ${\it Planck}$ cosmology

Virial halo mass function in the ${\it Planck}$ cosmology

Constraining FIMP from the structure formation of the Universe: analytic mapping from mWDM

A model for mixed warm and hot right-handed neutrino dark matter

Contact Info

Product

Resources

About

Constraining FIMP from the structure formation of the Universe: analytic mapping from m_WDM