No Boundary Proposal: Overview, Criticisms & Probes

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windy miller
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Any good places to go to get a better layman understanding of the no boundary proposal other than Hawking books? Id like to see what criticisms there are of the model, how has it evolved over time and is there any chance for experimental probes of it.
 
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Thanks Ill have a look at that, but that's not an easy book to follow either!
 
I've looked extensively for a decent explanation of it, but it remains hard because quantum cosmology is very technical and there are a lot of unresolved mathematical issues with it. I'm trying to sum it all up for myself, so if I have a decent conceptual understanding I'll come back ;)
 
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