Dark matter model favoured by reionization data: 7 keV sterile neutrino versus cold dark matter

Rudakovskyi, Anton; Iakubovskyi, Dmytro

doi:10.1093/mnras/sty3057

Cited by 5 publications

(4 citation statements)

References 105 publications

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“…Such dark matter is in a good agreement with the Ly-α forest analysis(Baur et al 2017) and reionization history data(Rudakovskyi & Iakubovskyi 2019).…”

supporting

confidence: 80%

Can EDGES observation favour any dark matter model?

Rudakovskyi,

Savchenko,

Tsizh

2019

Preprint

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The recent detection of the 21-cm absorption signal by the EDGES collaboration has been widely used to constrain the basic properties of dark matter particles. However, extracting the parameters of the 21-cm absorption signal relies on a chosen parametrisation of the foreground radio emission. Recently, the new parametrisations of the foreground and systematics have been proposed, showing significant deviations of the 21-cm signal parameters from those assumed by the original EDGES paper. In this paper, we consider this new uncertainty, comparing the observed signal with the predictions of several dark matter models, including the widely-used cold dark matter (CDM) model, 1-3 keV warm dark matter models (WDM), and 7 keV sterile neutrino (SN7) model, capable of producing the reported 3.5 keV line. We show that all these dark matter models cannot be statistically distinguished using the available EDGES data.

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“…Such dark matter is in a good agreement with the Ly-α forest analysis(Baur et al 2017) and reionization history data(Rudakovskyi & Iakubovskyi 2019).…”

supporting

confidence: 80%

Can EDGES observation favour any dark matter model?

Rudakovskyi,

Savchenko,

Tsizh

2019

Preprint

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“…In order to demonstrate this, we computed the 21-cm absorption signal using the ARES code for three models: CDM, thermal relics with a mass m TH = 6 keV (claimed to be excluded in [43,50]) and the resonantly produced sterile neutrino, with particle mass of 7 keV and lepton asymmetry L 6 = 10. 3 This sterile neutrino model is consistent with all astrophysical and cosmological bounds: x-ray bounds on decaying DM [39,[85][86][87][88][89][90][91][92], suppression of the power spectrum as inferred from the Lyman-α forest [93][94][95], cosmic reionization [64,96,97], and Milky Way satellite and galaxy counts [56,61].…”

mentioning

confidence: 58%

21-cm observations and warm dark matter models

et al. 2019

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Observations of the redshifted 21-cm signal (in absorption or emission) allow us to peek into the epoch of the "Dark Ages" and the onset of reionization. These data can provide a novel way to learn about the nature of dark matter, in particular about the formation of small-size dark matter halos. However, the connection between the formation of structures and the 21-cm signal requires knowledge of a stellar to total mass relation, an escape fraction of UV photons, and other parameters that describe star formation and radiation at early times. This baryonic physics depends on the properties of dark matter and in particular, in warm-dark-matter (WDM) models, star formation may follow a completely different scenario, as compared to the cold-dark-matter case. We use the recent measurements by EDGES [An absorption profile centred at 78 megahertz in the sky-averaged spectrum, Nature (London) 555, 67 (2018).] to demonstrate that when taking the above considerations into account, the robust WDM bounds are in fact weaker than those given by the Lyman-α forest method and other structure formation bounds. In particular, we show that a resonantly produced 7-keV sterile neutrino dark matter model is consistent with these data. However, a holistic approach to modeling of the WDM universe holds great potential and may, in the future, make 21-cm data our main tool to learn about DM clustering properties.

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“…We thus expect that future precise kSZ surveys will constrain the properties of DCDM tightly. Definitely, if the cold DM decays into electromagnetic particles, many other cosmological observables will provide additional information for detecting/constraining the decaying DM, such as the reionization history (e.g., [90,107,108]), and, the existence of DCDM can Figure 17: Comparison of the constraints on the parameters ω ini c , f dcdm and Γ dcdm for the short-lived DCDM model, from the SPT measurement of the kSZ signal at = 3000 and from the "Planck2015+BAO+RSD" dataset. The solid lines denote the SPT-measured 1σ upper limit of 4.2µK 2 and 2σ upper limit of 4.9µK 2 , and the dashed lines are the "Planck2015+BAO+RSD"-induced contours from Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Definitely, if the cold DM decays into electromagnetic particles, many other cosmological observables will provide additional information for detecting/constraining the decaying DM, such as the reionization history (e.g., [99][100][101]), and, the existence of DCDM can be strictly tested by ongoing and future reionization observations [102][103][104][105][106][107][108][109]. Moreover, the weak lensing surveys [110][111][112][113] are expected to further improve the constraints considerably.…”

Section: Discussionmentioning

confidence: 99%

Fractional Dark Matter decay: cosmological imprints and observational constraints

Xiao¹,

Zhang²,

An³

et al. 2020

J. Cosmol. Astropart. Phys.

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If a fraction f dcdm of the Dark Matter decays into invisible and massless particles (so-called "dark radiation") with the decay rate (or inverse lifetime) Γ dcdm , such decay will leave distinctive imprints on cosmological observables. With a full consideration of the Boltzmann hierarchy, we calculate the decay-induced impacts not only on the CMB but also on the redshift distortion and the kinetic Sunyaev-Zel'dovich effect, while providing detailed physical interpretations based on evaluating the evolution of gravitational potential. By using the current cosmological data with a combination of Planck 2015, Baryon Acoustic Oscillation and redshift distortion measurements which can improve the constraints, we update the 1σ bound on the fraction of decaying DM from f dcdm 5.26% to f dcdm 1.99% for the short-lived DM (assuming Γ dcdm /H 0 10 4 ). However, no constraints are improved from RSD data (f dcdm 1.03%) for the long-lived DM (i.e., Γ dcdm /H 0 10 4 ). We also find the fractional DM decay can only slightly reduce the H 0 and σ 8 tensions, which is consistent with other previous works. Furthermore, our calculations show that the kSZ effect in future would provide a further constraining power on the decaying DM.

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Dark matter model favoured by reionization data: 7 keV sterile neutrino versus cold dark matter

Cited by 5 publications

References 105 publications

Can EDGES observation favour any dark matter model?

Can EDGES observation favour any dark matter model?

21-cm observations and warm dark matter models

Fractional Dark Matter decay: cosmological imprints and observational constraints

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