Recent content by mbweissman

non-linear decoherence Hi Tez- Sorry for the delay- haven't been checking the forum. The idea was that if there were a non-linear decoherence process, the proper ratio of world-counts could arise asymptotically without fine-tuning. Basically it runs like this: if large-measure branches...

Although I'm not sure that Hurkyl's notation came through properly on my computer, I think I agree with his point. QFT describes (in one representation) the time evolution of a state vector. On it one can define 'expectation values' of operators, but the relation of those to actual expectation...

Yeah- I thought you might be interested in these excerpts from a I comment wrote on the zurek argument. (I tried a bit to get it published there.) The point is that our arguments are almost identical, which is reassuring. ...Here I argue Zurek makes an implicit assumption which runs counter...

agreed Yes, I agree completely. Deutsch, Wallace, Zurek etc do fine through the point of showing that equal-measure outcomes have equal probabilities. The next step involves assuming that probability is fixed after an experiment, and independent of observer. These are exactly the features...

branching ordering If somehow the probabilities could be properly justified in a unitary MWI, I don't see why the ordering would have any significance. For non-unitary pictures, along the lines I suggested, this issue could be more serious and problematic.

agreed Exactly! Let's talk about real data, i.e. counts of past outcomes, not unmeasurable utility functions.

It's hard to follow the example in detail, but the result cannot be right. If it were, then remote choices of whether to measure Alice would change the Bob-Charlie correlation. With a steady source of these entangled particles, somebody on a remote planet (spacelike separated from our...

no pruning Actually, my proposal involves anti-pruning, i.e. extra branching. There's an additional non-linear decoherence process which tends, in the long time limit, to make the average sub-branch (world) measures on each macro branch equal. Thus the limiting world counts on each branch...

locality in branching The branching order in MW is not important, fortunately, since the order of the events is generally not a Lorentz invariant. This issue is much less problematic for MWI than for collapse pictures. No choices are made in MWI, unlike collapse, so no superluminal...

APP, Graham, CPT I'm afraid that the people who really are paid to do this wouldn't consider me a professional in this area. My day job involves experimental work on disordered materials. FPL's first response to my submission was something like 'dear sir or madam: your paper or papers has or...

PP, APP, and non-unitarity I haven't had a chance to read the van Esch paper yet, but from this thread it sounds like all its points are reasonable, whether or not they were anticipated by Barnum, whose paper I also haven't read. They certainly are not points widely acknowledged in the Everett...