Can Square Kilometre Array phase 1 go much beyond the LHC in supersymmetry search?

Kar, Arpan; Mitra, Sourav; Mukhopadhyaya, Biswarup; Choudhury, Tirthankar Roy

doi:10.1103/physrevd.99.021302

Cited by 22 publications

(54 citation statements)

References 49 publications

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“…On the whole, in addition to the exploitation of low-frequency flux, our study improves on existing knowledge in the following way: any positive signal in Phase II will point towards either magnetic field on the higher side (> 2 µG) or a diffusion coefficient at the lower end (≈ 3 × 10 26 cm 2 s −1 ). An exception can be in the form of σv higher than what is predicted in our benchmark [1] by about two orders of magnitude, which in tern contradicts the WIMP hypothesis itself.…”

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confidence: 73%

“…Introduction: The synchrotron radiation produced because of self-annihilating dark matter (DM) candidate particles in dwarf spheroidal (dSph) galaxies (objects with high mass-to-light ratios indicating a high abundance of DM) can be a promising probe of DM models. [1] explore the use of the Square Kilometre Array (SKA) for the detection of synchrotron signatures from dSphs (Draco, Segue I, and Ursa Major II); they demonstrate that the SKA could significantly exceed the reach of the Large Hadron Collider (LHC) in the search for self-annihilating DM candidate particles that produce charged particles and hence synchrotron emission due to an in-situ magnetic field. Such predicted synchrotron signals were discussed earlier by [2], but for masses within the LHC reach.…”

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confidence: 99%

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Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations

Kar

Mitra²,

Mukhopadhyaya

et al. 2019

Phys. Rev. D

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We present the first observational limits on the predicted synchrotron signals from particle Dark Matter annihilation models in dwarf spheroidal galaxies at radio frequencies below 1 GHz. We use a combination of survey data from the Murchison Widefield Array (MWA) and the Giant Metre-wave Radio Telescope (GMRT) to search for diffuse radio emission from 14 dwarf spheroidal galaxies. For in-situ magnetic fields of 1 µG and any plausible value for the diffusion coefficient, our limits do not constrain any Dark Matter models. However, for stronger magnetic fields our data might provide constraints comparable to existing limits from gamma-ray and cosmic ray observations. Predictions for the sensitivity of the upgraded MWA show that models with Dark Matter particle mass up to ∼ 1.6 TeV (1 TeV) may be constrained for magnetic field of 2 µG (1 µG). While much deeper limits from the future low frequency Square Kilometre Array (SKA) will challenge the LHC in searches for Dark Matter particles, the MWA provides a valuable first step toward the SKA at low frequencies.

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confidence: 73%

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confidence: 99%

Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations

Kar

Mitra²,

Mukhopadhyaya

et al. 2019

Phys. Rev. D

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“…While the prospect of radio fluxes unveiling DM annihilation has been explored in earlier works [30][31][32][33]35], it was pointed out in reference [36] that SKA opens up a rather striking possibility. The annihilation of trans-TeV DM pairs in dwarf spheroidal galaxies (dSph) lead to electron-positron pairs which, upon acceleration by the galactic magnetic field, produces such radio synchrotron emission.…”

Section: Introductionmentioning

confidence: 99%

“…The SKA can ensure sufficient sensitivity required to detect the faint signal from the sources, and at the same time, will have high enough resolution to remove the foregrounds. It was shown in [36] that about 100 hours of observation at the SKA can take us above the detectability threshold for radio signals from the annihilation of DM particles in the 5-8 T eV range. Of course, the compatibility of such massive WIMP with the observed relic density requires a dark sector spectrum with enough scope for co-annihilation in early universe, as was demonstrated in [36] in the context of the MSSM.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, we use some theoretical benchmark points to demonstrate the usefulness of the SKA in probing trans-TeV DM. A few sample MSSM spectra are used, largely because they offer the scope of co-annihilation that is so essential for maintaining the right relic density [36]. Using the minimum annihilation cross-section required for any DM mass for detection at SKA (in 100 hours), and the maximum value of this cross section that is compatible with limits from γ-ray and cosmic-ray data, we show that several benchmark points with DM mass in the 1-8 T eV range, which are yet to be ruled out by any observation can be investigated in 100 hours of SKA observation.…”

Section: Introductionmentioning

confidence: 99%

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Heavy dark matter particle annihilation in dwarf spheroidal galaxies: Radio signals at the SKA telescope

Kar

Mitra²,

Mukhopadhyaya

et al. 2020

Phys. Rev. D

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A weakly interacting dark matter candidate is very difficult to detect at highenergy colliders like the LHC, if its mass is close to, or higher than, a TeV. We argue that the pair-annihilation of such particles may give rise to e + e − -pairs in dwarf spheroidal galaxies (dSph), which in turn can lead to radio synchrotron signals that are detectable at the upcoming square kilometre array (SKA) telescope within a fairly moderate observation time. We investigate in detail the underlying mechanisms that make this possible. Both particle physics issues and those pertaining to astrophysics, such as diffusion, electromagnetic energy loss and the effects of interstellar magnetic field, are examined with reference to their roles in generating radio flux. We first identify the detectability criteria in a model-independent manner. It is observed that fluxes may be detectable for scenarios that are consistent with all constraints available till date from γ-ray and cosmic-ray observations. Thereafter, using benchmarks based on popular scenarios involving physics beyond the standard model, we show that it should be possible to detect the radio flux from a dSph like Draco with 100 hours of observation at the SKA, for dark matter particle masses upto 4-8 TeV. The corresponding frequency distributions are also presented, where it is found that the frequency range 300 MHz -50 GHz is especially useful for recording the annihilation signals of trans-TeV particles.

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SKA-Phase 1 sensitivity to synchrotron radio emission from multi-TeV Dark Matter candidates

Cembranos

Cruz-Dombriz

Gammaldi

et al. 2020

Physics of the Dark Universe

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In the era of radio astronomy, the high sensitivity of the Square Kilometre Array (SKA) could play a decisive role in the detection of new radio sources. In this work, we study the SKA sensitivity to the synchrotron radio emission expected by the annihilation of TeV DM candidate in the Draco dwarf spheroidal galaxy. On the one hand, we consider model-independent DM candidates: we find out that with 1000 hours of data-taking, SKA1-MID will be able to exclude up to 10 TeV thermal DM candidates that annihilate in W + W − and bb channels. We also study as these constraints improve by including a density enhancement due to a DM-spike associated with an intermediate-mass black hole in Draco. On the other hand, we consider extra-dimensional brane-world DM candidates, dubbed branons. In this specific scenario, SKA allows us to set constraints on the branon parameter space (f , M ), where f is related to the coupling of the branon to the Standard Model particles and M is the mass of the branon itself. In particular, we consider two different branon DM candidates. We find out that SKA will be able to set more stringent constraints on the branon DM candidate required in order to fit the AMS-02 data, yet the sensitivity of the instrument should be improved in order to study the branon candidate for the Galactic Centre. Nonetheless, we show that SKA represents -among other detectors -the most promising instrument for multi-wavelength detection of synchrotron radio emission by annihilating multi-TeV DM.PACS numbers: 04.50. Kd, 98.80.-k, 98.80.Cq, 12.60.-i arXiv:1905.11154v2 [hep-ph] 7 Jan 2020 M E dE s G (r, E, E s ) Q e (r, E). (3) The spherical symmetry of the problem and its boundary conditions suggest the use of the image charge 1 The mass-to-light ratio in the case of Draco is M/L ∼ 300M /L [34]. 2 In this work we considered a NFW profile, ρ NFW (r) = ρs r rs 1+ r rs 2 , with ρs = 1.40 GeV/cm 3 and rs = 1 kpc.

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Can Square Kilometre Array phase 1 go much beyond the LHC in supersymmetry search?

Cited by 22 publications

References 49 publications

Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations

Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations

Heavy dark matter particle annihilation in dwarf spheroidal galaxies: Radio signals at the SKA telescope

SKA-Phase 1 sensitivity to synchrotron radio emission from multi-TeV Dark Matter candidates

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