de Sitter versus Minkowski QFT and cosmological constant WMAP/Planck results confirm than we live in a de Sitter-like phase, i.e., a Universe with positive acceleration or positive cosmological constant! Therefore, I believe that a way to solve the cosmological constant problem could be to extend QFT from Minkowski to de Sitter space. I would not be surprised if our "mistake" to get the theoretical "wrong" value of the cosmological constant is associated to the fact of calculating the vacuum energy in a Minkowskian QFT setting. 
My question is: what are the problems that a QFT on de Sitter space faces in order to explain the observed vacuum energy? Could it work? 
PS: Does someone know good references about QFT in de Sitter space?
 A: Rie.
Like your question.  I've been stewing on this for 5 yrs now, but have gotten nowhere.  Suggestions.  For moral support on the CC, see Carlo Rovelli's great paper:http://arxiv.org/abs/1002.3966.
For physics(CC only, no dSS) see Beck: http://arxiv.org/abs/0810.0752
The electron & therefore QED must be involved. Dirac's 1935 paper was first to explore the relations of the electron in deSitter space. At first, it seems ridiculous: dS space is Defined tb devoid of particles & radiation !  However, there is a well defined area in GR w/its own metric, the Schwarzschild-deSitter metric. Combine that w/the infamous model of the Dirac electron as a Kerr-Newman BH & you see where this is going.  If dS space can accommodate a BH, who cares if it's an electron !
So the idea is to do QED in dS space. The literature is Huge on QFT in dS space, but not much on QED/dS. Indeed, Planck's refined value of 3.3Gev/m^3 => a new target value for Lambda ~ 1.1E-52/m^2.
Do let me know if you have any ideas how to attack this problem.
The 'absence' of radiation & particles in dS space is of course a classical concept & I agree that Unruh & Hawking change the rules. Dirac's 1935 paper was the first, vis a vis the electron & dS space. It transforms the momentum-Dirac eq. over to an angular momentum eq.  So is this quon thing your idea ?
I confess I've never heard of it. Refs?  Anything beats SUSY, & I'm convinced she'll be history after the LHC 2015 run !
