<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>e</mml:mi><mml:mi>X</mml:mi><mml:mi>T</mml:mi><mml:mi>P</mml:mi></mml:math> perspectives for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mi>MSM</mml:mi></mml:math> sterile neutrino dark matter model
D. Malyshev, Charles Thorpe-Morgan, A. Santangelo, J. Jochum, Shuang‐Nan Zhang
Abstract
We discuss the potential of the $eXTP$ x-ray telescope, in particular its Spectroscopic Focusing Array, Large Area Detector and Wide Field Monitor 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 ($\ensuremath{\nu}\mathrm{MSM}$) 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 $\ensuremath{\nu}\mathrm{MSM}$ parameters and serve as a precursor for the Athena mission in decaying dark matter searches.