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Can the future affect the past?

Retrospective action occurs. If the future can affect the past, causality fails and with it physics. 

Yet in delayed choice experiments, an observation made after a photon takes a path defines the path it takes 

We would not doubt that the physical world was objectively real, if only it would behave so, but it doesn’t.

 In an objective reality time doesn't dilate, space doesn’t bend, objects don’t teleport, empty space is empty and universes don’t pop up out of nowhere. 

So much for 'objective' reality.

But maybe we are all linked in to a giant computer simulation that sends a signal of pain when we send a motor signal to swing an imaginary foot at an imaginary stone. 

Hawkings says, 'Maybe we are characters in a computer game played by aliens.” (Vacca, 2005) p131 Then his next sentence was “Joking apart…”

 But why must it inevitably be a joke? Conversely, if we find that physical realism is impossible, the Sherlock Holmes dictum should apply, that: “When you have excluded the impossible, whatever remains, however improbable, must be the truth” If the physical world can’t be an objective reality, science must consider whether it is a virtual one.

In a virtual reality, the processor must be outside it

A system can no more compute itself than two hands can draw each other. So it is quite impossible for our world to be the output of quantum processing occurring in our space and time

If the physical world is virtual, it is all an output, so one can’t have the virtual cake and keep the physical world too. Conversely, a virtual word must be finite, because what is infinite can't be computed, so the laws of physics must be calculable, as they all are. 

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