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May 12, 2011 at 3:50 comment added Columbia People have tried to define observables in DS by tunneling into flat space and using the SMatrix defined there. But even there it is unclear as to how much of the spacetime this can cover, or if it is a well defined process
May 11, 2011 at 18:11 comment added Luboš Motl Dear lurscher, thanks for your compliment. The set of states that an observer can prepare on the initial slice - or observe on the final slice - is essentially empty. So the restriction is a restriction down to an empty set of data. If you happen to agree, would you agree that your question then loses beef? There are no known accurately defined observables associated with the full de Sitter spacetime. Of course, one may try to predict things "patch-wise", by treating pieces of the de Sitter space as Minkowski-like spaces. But the whole union is a problem.
May 11, 2011 at 18:08 history edited Luboš Motl CC BY-SA 3.0
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May 11, 2011 at 17:40 comment added lurscher very enlightening answer Lubos. Does it make sense to relax the notion of observable by restricting the families of states that can be prepared and measured? or its all or nothing?
May 11, 2011 at 17:24 history answered Luboš Motl CC BY-SA 3.0