The Fat Graviton (...is the Dark Matter)
A major breakthrough in the theory of Gravity was the recent discovery of the first physically consistent, ghost-free extension of General Relativity to additional interacting massive spin-2 fields. The mass of the new graviton is always assumed to be extremely small, about the inverse size of the observable Universe today. However, this is not demanded neither theoretically nor observationally. Indeed, a fat graviton is the most perfect candidate for the observed Dark Matter.