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Modified / Massive gravity
Another idea to solve the cosmological constant problem, is to weaken the effect the vacuum energy has on the geometry by modifying gravity at large distances (of the order of the Hubble scale today). Effectively this is possible the graviton was massive or had resonance.
This is the idea behind the degravitation model suggested by
N. Arkani-Hamed, S. Dimopoulos, G. Dvali and
G. Gabadadze, in 2002 and by
G. Dvali, S. Hofmann, and J. Khoury, in
2007.
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