Retro-causality is effects preceding cause, travel to past etc.
Einstein had pleaded to Feynman, “the moon exist even when I don't look at it”?! I was convinced my self that BB interpretation of QM made sense. I was part of tiny minority, that opposed standard QM (no reality exists till you look at it) to many-world interpretations. Weak measurements were starting to prove me right. Till I read about this Australian ANU experiment of 2015 that shook me. QM is best displayed as behavior in double slits.
Eraser experiment brings out the strangeness. If it is single slit,. Electrons pass as particle. But if both open,. They interfere as waves! Which slit does an electron go through? It is undecidable, standard QM says through both! As if it were a wave! But then closing one slit won't make it a particle! So eraser is paradoxical, hard but explainable in BB.
The ANU experiment is awful to explain. Using two lasers to make a channel, and another to make a double slit, its is possible to tie the second laser to a random number, Particle is shot between the two starting lasers and registers as a particle. Whenever the spilling laser if on, it forms a double slit and interference happens. Problem is the random numberconsistently makes a double slit BEFORE the effects seen!
Some how, the two-slitnessinformation goes to past! Else Copenhagen QM is right, electron goes though both channels, Or super determinism is right and everything that happens is predetermined even causes for all events in future so that future results can happen right for past. It devastates all definite science theories, only magic theories with collapse on measurement remains and objects don't exist till looked at, the bother of Einstein!
Perhaps there is non-retro casual BB explain for it! I am neither ready to collapse magic, retro-casualty or super determinism explains. but have no choice perhaps.
Amazing Answers
It is my firm belief that the last seven decades of the twentieth century will be characterized in history as the dark ages of theoretical physics. Carver Mead – from his book Collective Electrodynamics
Tes, BB can! Actually extension the produces a join of GR and QM with these amazing properties -1, retro-casualty only happens at quantum level particles. It is a loop-free retro-casualty, grandfather-paradoxes cannot happen.
2. entanglement is a manifestation of retro-casualty!
3. The GR produced is lorentz-invariant.
4. It is based on dilaton model, distinct from strings and loop quantum gravity.
For once, I do not feel sad about being confused!
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