eXTP perspectives for the $\nu$MSM sterile neutrino dark matter model

Abstract

We discuss the potential of the eXTP X-ray telescope, in particular its Spectroscopic Focusing Array (SFA), Large Area Detector (LAD) and Wide Field Monitor (WFM) for the detection of a signal from keV-scale decaying dark matter. We show that the sensitivity of the eXTP is sufficient to improve existing constraints on the mixing angle of the neutrino Minimal extension of the Standard Model ($\nu$MSM) by a factor of 5-10 within the dark matter mass range 2-50 keV, assuming 1% level of systematic uncertainty. We assert that the eXTP will be able to probe previously inaccessible range of $\nu$MSM parameters and serve as a precursor for the Athena mission in decaying dark matter searches.

Updated to match accepted version

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• Les Houches Lectures on Indirect Detection of Dark Matter
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• THESEUS Insights into ALP, Dark Photon and Sterile Neutrino Dark Matter
• Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands
• Probing self-interacting sterile neutrino dark matter with the diffuse supernova neutrino background
• Search for primordial black hole dark matter with X-ray spectroscopic and imaging satellite experiments and prospects for future satellite missions
• Towards Testing Sterile Neutrino Dark Matter with Spectrum-Roentgen-Gamma Mission
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Exploring Ultralight Scalar Assistance in Sterile Neutrino Dark Matter: Cold Spectrum and Unusual X/Gamma-ray Signatures
• Opening up New Parameter Space for Sterile Neutrino Dark Matter
• Sterile neutrino Dark Matter in the minimal Dirac Seesaw