A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA

Dutta, Koushik; Ghosh, Avirup; Kar, Arpan; Mukhopadhyaya, Biswarup

doi:10.1088/1475-7516/2022/09/005

Cited by 11 publications

(5 citation statements)

References 157 publications

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“…Such radio waves can be tested by radio telescopes like the Square Kilometer Array (SKA) radio telescope [91]. It is found that the DM decay width up to Γ DM ≳ 10 −30 s −1 is detectable at SKA assuming 100-hour observation time [92].…”

Section: Jcap05(2024)071mentioning

confidence: 99%

Quantum gravity effects on fermionic dark matter and gravitational waves

King,

Roshan,

Wang

et al. 2024

J. Cosmol. Astropart. Phys.

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We explore the phenomenological consequences of breaking discrete global symmetries in quantum gravity (QG). We extend a previous scenario where discrete global symmetries are responsible for scalar dark matter (DM) and domain walls (DWs), to the case of fermionic DM, considered as a feebly interacting massive particle, which achieves the correct DM relic density via the freeze-in mechanism. Due to the mixing between DM and the standard model neutrinos, various indirect DM detection methods can be employed to constrain the QG scale, the scale of freeze-in, and the reheating temperature simultaneously. Since such QG symmetry breaking leads to DW annihilation, this may generate the characteristic gravitational wave background, and hence explain the recent observations of the gravitational wave spectrum by pulsar timing arrays. This work therefore highlights a tantalizing possibility of probing the effective scale of QG from observations.

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Section: Jcap05(2024)071mentioning

confidence: 99%

Quantum gravity effects on fermionic dark matter and gravitational waves

King,

Roshan,

Wang

et al. 2024

J. Cosmol. Astropart. Phys.

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“…On raising ρ to 0.7 GeV cm −3 [70][71][72][73], the limits become stronger by a factor of eight. Following [27,74], we parameterize the AMS-02 measured positron flux spectrum as a polynomial function (f (α)) of energy and define the χ 2 as…”

Section: Jcap08(2023)071mentioning

confidence: 99%

“…For further details of the analysis methodology, see [27,74]. In obtaining the limits on σv , we assume a single-component WIMP accounts for the entire DM content.…”

Section: Constraints On Total Annihilation Cross-sectionmentioning

confidence: 99%

MeV to multi-TeV thermal WIMPs: most conservative limits

Dutta,

Ghosh,

Kar

et al. 2023

J. Cosmol. Astropart. Phys.

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We consider a weakly interacting massive particle (WIMP) dark matter (DM) annihilating into all possible Standard Model (SM) particle pairs, including the SM neutrinos, via s-wave processes and derive the branching ratio independent upper limit on the total annihilation cross-section 〈σv〉 using the data of CMB, gamma-ray, cosmic-ray and several neutrino observations. For conservative choices of all relevant astrophysical parameters, we obtain upper limits of 10-23–10-25 cm3 s-1 on the total 〈σv〉 for the WIMP mass range 10 MeV–100 TeV, thus making the entire mass range consistent with the observed relic density. An important input that goes into our analysis is the assumption that thermal WIMPs can have significant coupling to the SM neutrinos.

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“…limit can be obtained by χ 2 ( σv 95 ) ≡ χ 2 bf + 2.71. This methodology has been widely used in literature [17,58,59].…”

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confidence: 99%

Boosting indirect detection of secluded dark matter sector

Li¹,

Nomura²,

Pei³

et al. 2023

Preprint

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Dark Matter (DM) residing in a secluded sector with suppressed portal interaction could evade direct detections and collider searches. The indirect detections provide the most robust probe to this scenario. Depending on the structure of the dark sector, novel DM annihilation spectra are possible. The dark shower is a common phenomenon for particles in the dark sector, which take part in strong interactions and are boosted. In terms of simplified two-component DM models with vector portal interaction and pseudoscalar portal interaction, we study the dark showering effects for DM indirect detection. In those models, the heavier DM component which dominates the relic density annihilates into boosted lighter species. Together with the large coupling through which the lighter DM annihilates away in the early universe, the showered spectra provide as the smoking gun for the DM existence. Considering bounds obtained by the AMS-02 positron data and Fermi-LAT measurement of gamma-ray from the dwarf galaxies, we find the dark shower could open a new region of sensitivity that can not be probed before.

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A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA

Cited by 11 publications

References 157 publications

Quantum gravity effects on fermionic dark matter and gravitational waves

Quantum gravity effects on fermionic dark matter and gravitational waves

MeV to multi-TeV thermal WIMPs: most conservative limits

Boosting indirect detection of secluded dark matter sector

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