Probing interacting dark energy and scattering of baryons with dark matter in light of the EDGES 21-cm signal

Mukhopadhyay, Upala; Majumdar, Debasish; Datta, Kanan K.

doi:10.1103/physrevd.103.063510

Cited by 14 publications

(15 citation statements)

References 68 publications

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“…This is however expected from Eq. 9 since the cooling rate of the baryon is inversely proportional to DM mass [37].…”

Section: A Lognormal Mass Distribution Of Primordial Black Holementioning

confidence: 99%

“…[34][35][36]. In the present analysis, cross-section σ is parameterized as σ = σ 0 (v/c) −4 [1,37,38] where the term σ 0 is the absolute scattering cross-section of DM -baryon scattering. Several recent phenomenological studies on the global 21cm signal also suggest the similar velocity dependence (n = −4) of the baryon-DM cross-section [1,35,36,38,39].…”

Section: Introductionmentioning

confidence: 99%

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Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses

Mukhopadhyay¹,

Majumdar²,

Halder³

2022

Preprint

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The evaporation of Primordial Black Hole (PBH) via Hawking radiation influences the evolution of Inter Galactic Medium by heating up the latter and consequently affects the 21cm signal originated from the neutral Hydrogen atoms. In this work, we have considered EDGES observational data of 21cm line corresponding to cosmic dawn era to constrain the mass and the abundance of PBHs. In this context, three different PBH mass distributions namely, monochromatic, power law and lognormal mass distributions are considered to estimate the effects of PBH evaporation on the 21cm brightness temperature T 21 . The impacts of Dark Matter -baryon interactions on T 21 are also considered in this work along with the

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“…This is however expected from Eq. 9 since the cooling rate of the baryon is inversely proportional to DM mass [37].…”

Section: A Lognormal Mass Distribution Of Primordial Black Holementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses

Mukhopadhyay¹,

Majumdar²,

Halder³

2022

Preprint

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“…Many studies explain the depth either by postulating excess cooling of cosmic hydrogen due to novel physical mechanisms (Barkana 2018;Muñoz & Loeb 2018;Berlin et al 2018;Houston et al 2018;Li et al 2021;Mathur et al 2021), or by bringing into play a part of the excess radio background observed at relevant frequencies (Feng & Holder 2018;Pospelov et al 2018;Moroi et al 2018;Sierra & Fong 2018;Fraser et al 2018;Ewall-Wice et al 2018;Jana et al 2018;Chianese et al 2019;Lawson & Zhitnitsky 2019;Choi et al 2020;. Some studies invoke even more exotic scenarios, such as a modified Hubble parameter at cosmic dawn (Hill & Baxter 2018;Costa et al 2018;Wang & Zhao 2018;Xiao et al 2019), new coupling terms in the spin temperature (Widmark 2019;Lambiase & Mohanty 2020;Dhuria et al 2021), or special classes of dark energy and dark matter models (Mukhopadhyay et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Implications of the cosmological 21-cm absorption profile for high-redshift star formation and deep JWST surveys

Mittal,

Kulkarni

2022

Preprint

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Apart from its anomalously large depth, the cosmological 21-cm absorption signal measured by the EDGES collaboration also has a shape that is distinctly different from theoretical predictions. This peculiar shape requires the establishment of a cosmic Ly 𝛼 background within 25 Myr at redshift 𝑧 ∼ 20 and a cosmic X-ray background within 50 Myr at redshift 𝑧 ∼ 15. Models with non-traditional components such as super-adiabatic baryonic cooling or an excess radio background explain the depth of the observed profile, but still conspicuously fail to explain its shape. In this paper, we quantify the requirements imposed by the EDGES measurement on sources of Ly 𝛼 and X-ray photons at cosmic dawn. In extreme cases, the Ly 𝛼 and X-ray emissivities require to be enhanced by up to an order of magnitude relative to traditional models. Furthermore, this enhancement needs to be active only for a short duration. We find that under conventional assumptions for the cosmic star formation density, standard stellar populations are incapable of meeting these conditions. Only highly unusual models of massive metal-free stars seem to provide a possible mechanism. Conversely, if the sources of Ly 𝛼 and X-ray photons are compelled to have standard properties, the EDGES measurement puts strong demands on the cosmic star formation rate density. This provides interesting falsifiable predictions for high-redshift galaxy surveys enabled by JWST. We derive predictions for galaxy UV luminosity functions and number densities, and show that a deep JWST survey with a limiting UV magnitude of 𝑚 UV,lim = 32 would potentially be able to rule out the predictions enforced by the EDGES measurement.

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“…In certain models baryon-dark matter interaction could lead to significant cooling of the baryonic fluid [6][7][8][9]. Other phenomena that impact the baryon temperature include decay/annihilation of normal dark matter candidates [8,10] and/or super-heavy dark matter [11], dark matter -dark energy interaction [11][12][13][14][15][16][17][18][19], viscosity of the dark matter fluid [20] and other forms of energy injection in the pre-recombination era [21]. Primordial black holes may constitute a significant fraction of dark matter [22,23] and their evaporation impacts the temperature of the 21-cm signal, as well [9,10,[24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…However, as there is no publicly available data from the SARAS experiment, we use the EDGES result only in our calculations, similar in approach to other recent works [7,8,11,25,45]. In order to perform an analysis of the interplay of the effect of VDE, primordial black hole (PBH) evaporation and the baryon-dark matter interaction on the 21-cm temperature, we consider PBHs with near present era evaporating mass range ∼ 10 14 ≤ M BH 2 × 10 15 g, along with a widely used form of the baryon -dark matter scattering cross-section [6,7,9,11,12,[46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Global 21-cm brightness temperature in viscous dark energy models

Halder¹,

Pandey²,

Majumdar³

2022

Preprint

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We investigate the observational excess of the EDGES experiment on the global 21-cm brightness temperature (−500 +200−500 mK at redshift 14 < z < 20) in the context of viscous dark energy (VDE) models. The bulk viscosity of dark energy perturbs the Hubble evolution of the Universe which could cool baryons faster, and hence, alter the 21-cm brightness temperature. An additional amount of entropy is also produced as an outcome of the viscous flow. We study the contribution of Hawking radiation from primordial black holes and baryon-dark matter scattering in the backdrop of VDE models towards modification of the 21-cm temperature. We obtain bounds on the VDE model parameters in order to account for the EDGES result due to the interplay of the above effects. Moreover, our analysis yields modified constraints on the dark matter mass and scattering crosssection compared to the case of the ΛCDM model.

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Probing interacting dark energy and scattering of baryons with dark matter in light of the EDGES 21-cm signal

Cited by 14 publications

References 68 publications

Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses

Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses

Implications of the cosmological 21-cm absorption profile for high-redshift star formation and deep JWST surveys

Global 21-cm brightness temperature in viscous dark energy models

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