Abstract
If dark matter is made of particles governed by weak-scale physics, they may annihilate or decay to leave observable signatures in high-energy gamma-ray sky. In addition, any charged particles produced by the same process will also give low-frequency photons through successive electromagnetic interactions. Plenty of data from modern astrophysical measurements of various wavelengths, especially gamma rays, enabled new analysis techniques to search for these dark matter signatures with an unprecedented sensitivities. Since it is very likely that signatures of dark matter annihilation or decay is hidden in the gamma-ray data, one should fully utilize all available data including: (1) energy spectrum of all wavelengths ranging from radio to very-high-energy gamma rays; (2) spatial clustering probed with the angular power spectrum of the gamma-ray background; (3) cross correlation between the gamma-ray distribution with nearby galaxy catalogs; and (4) gamma-ray-flux distribution. I will review recent theoretical and observational developments in all these aspects, and discuss prospects for the future towards discovery of dark matter as an elementary particle in physics beyond the standard model.
Highlights
One of the most popular and best-studied candidates of dark matter is a weakly interacting massive particle (WIMP)
The argument that gives it a strong motivation is that the measured density of dark matter in the present Universe can be well explained by thermal freeze-out mechanism, in which WIMP dark matter particles were in thermal equilibrium, but at later time, left the thermal bath as a relic particle without being annihilated due to the cosmic expansion
The relic density is related to the annihilation cross section, and if weak-scale physics is assumed, the predicted relic density nicely matches with the observations [1]
Summary
One of the most popular and best-studied candidates of dark matter is a weakly interacting massive particle (WIMP). Its density-squared dependence of the annihilation rate should leave quite different features compared with ordinary astrophysical sources that trace dark matter density [2] This EGRB anisotropies were recently detected in the form of angular power spectrum at degree-level angular scales for energy bins between 1 GeV to 50 GeV [20]. Such tomographic method is proven to enhance sensitivities to the dark matter annihilation. The tomographic method can be applied to obtain stringent constraints on properties of sources for high-energy neutrinos detected with IceCube [33]
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