By the 2030s, in its complete configuration, GRAND will reach a sensitivity that will likely ensure the detection of neutrinos with energy above 1017 eV. Thanks to its sub-degree angular resolution, it will launch neutrino astronomy! Already by 2025, GRAND will be competitive to make the first discovery of these neutrinos. GRAND will also be the largest experiment for the detection of ultra-high energy cosmic rays and photons. Moreover, GRAND will uniquely explore Fundamental Neutrino Physics, the Astrophysics of Fast Radio Bursts, and the Epoch of Reionization.
How does GRAND work?
The strategy of GRAND is to detect air showers above 1017 eV, that are induced by the interaction of high‑energy particles in the atmosphere or underground, through its associated coherent radio-emission in the 30-300 MHz range.
With the first detection of very high-energy neutrinos and gravitational waves, we stand today at the threshold of a multi-messenger era. Many high-precision high‑energy astroparticle experiments are projected (CTA, IceCube-Gen2, LISA…) and GRAND is needed to complete the picture from the highest energy front. Radio-detection of astroparticles is experiencing a renaissance, with drastic technological, theoretical and numerical advances. Now is the time to develop the technique further and join the exciting momentum of high-energy Astrophysics!
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