Retrocausal Tractability?

[infsup]

Any or all present events verify future causes, such that for all futures, causality can not be ruled out. Where is there a future that has no past? Is the search for the Higgs field intractable or illogical?

[Wallace]

I believe you are talking about the papers (and recent coverage) of Nielsen and Ninomiya?

Sean Carrol has made a well reasoned response over at Cosmic Variance (http://blogs.discovermagazine.com/cosmicvariance/2009/10/14/spooky-signals-from-the-future-telling-us-to-cancel-the-lhc/) which is well worth a look.

[Chronos]

What 'universal property' do you suggest that rules out causality? That is a ridiculous proposition. Observation does not support this claim.

[Wallace]

I think the OP has muddled the terminology somewhat. The issue is actually about retro-causality, i.e. the future determines the present, which has been investigated in a cargo cult science way by a couple of researchers who should know better.... At least that's my view! The link I gave to Sean Caroll's blog has a kinder treatment of the work (he concludes it is crazy, but not crackpot crazy). There is plenty of other commentary about this on the blogosphere from the usual suspects (Peter Woit etc).

[infsup]

This is the idea exactly, thank you Chronos. Wallace thank you also, two notes on the topic, some current research indicates the use of cross entropy correlations in the past future stability of non-local trajectories, since mean field approximations for all calculated futures should contain near perfect information irrespective of initial measurement. This as an area of forecasting, looking to explore. Secondly from a logical perspective, this could be an NP incomplete search, such that there is no context to deterministically define where the search halts or where to begin. We could say from a classical dynamic perspective that general notion of the field is somewhat implausible. This is not to say that such an algorithm is intractable, just that the thermodynamics of space time and standard relativity models are difficult to describe; in the same context.

[Chronos]

It's a self-eating watermelon. The universe cannot dictate its own past because it would alter its future ability to do so [a killing your grandfather thing]. That is a paradox that cannot be resolved by logical or math.

[infsup]

Chronos, in my first post this was a 'showing a tell' to what Wallace has clearly indicated. As to Wallace my hopes are that the super symmetric non standard models can be proven, and the search for the Higgs field, and its four or more super partners can find a tractable position to continue. As my thoughts on time reversal symmetry, regardless of any statistical bound must continue from a logical heuristic if one is to be found. In defense of any statistical bound causing future completely separate from present or past could only adhere to an original question of the origin of the universe, in addition much of the confusion is hidden in hyperbolic geometric interpretations of the universe, where Einstein like myself could argue places all matter on the [bound].