Kavli Affiliate: Shigeki Matsumoto | First 5 Authors: Yu Watanabe, Alexander Kusenko, Shigeki Matsumoto, , | Summary: We explore whether the unprecedented energy resolution of upcoming gamma-ray telescopes can uncover relativistic effects in photon spectra resulting from dark matter (DM) annihilation or decay near the supermassive black hole (SMBH) at the Galactic Center (GC), specifically, […]