Gamma rays and neutrinos are two complementary messengers that help us to
understand the physics processes that shape the high-energy universe.
They also might allow us to identify the particle nature of dark matter.
I will introduce the most sensitive telescopes in their respective energy
ranges to study astrophysical neutrinos and gamma rays, the IceCube
neutrino
telescope located at South Pole and the satellite-based Fermi Large Area
Telescope.
Then I will focus on the lessons we can learn from observations of the
diffuse glow
of gamma rays and neutrinos that is emitted from all the gamma-ray and
neutrino
sources throughout the universe that are too weak to be detected
individually.
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