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has unambiguously been discovered by looking at the Cosmic Microwave Background
and galaxy rotation curves
. Are these observations caused by a particle? Alternatively, is it a MACHO
or does it have something to do with Quantum Gravity
The question will be considered answered and this market will be closed if a dark matter particle is detected with 5 sigma significance in all of three ways: direct detection (the particle scatters off a detector on earth), indirect detection (any evidence that it is a particle from astrophysical observations, such as its annihilation), and production (creating it in an accelerator experiment). It will also be closed if another theory is capable of explaining the above observations (CMB + galaxy rotation curves) is proven at the 5 sigma significance level, and a dark matter particle is not discovered.