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Cosmic rays, gamma-rays and neutrinos bring us information about the relativistic Universe. They provide us glimpses of the extremely energetic phenomena which are still beyond the scope of the most powerful accelerators on earth. At high energies cosmic rays, gamma-rays & neutrinos are produced in the vicinity of super massive black holes, neutron stars and due to shock acceleration caused by supernovae. However cosmic rays, mostly protons, being charged particles are deflected in their path, therefore their source of origin is still unknown. Thus to study the high energy Universe we have to rely upon gamma-rays and neutrinos, being neutral they are not deflected in their path and since they escape from deep interiors of astrophysical sources they can provide answers to many fundamental questions. In this presentation apart from discussing acceleration mechanisms for these cosmic messengers I will also talk about detection techniques. Coming decades are very exciting for astroparticle physics with upcoming detectors such as CTA, IceCube-Gen2 etc. I will briefly discuss them as well. |