A very peculiar suggestion

New Scientist has finally run an article talking about a recent proposal as to why the arrow of time always seems to move forward, rather than backwards as the laws of physics would allow.

The idea is that things do happen "backwards", it's just that in so doing, quantum mechanics if applied on a big enough scale means they leave no information behind that they have happened.

I keep trying to work out how this relates to the "tree falling in a wood with no one to hear it" question. Of course it still makes a sound; the lack of observation doesn't stop that. In the same way, I suppose, just because a "backwards" event can't be detected might not mean that it hasn't happened.

On the other hand, any scientist who believes this idea doesn't have much right to be a ridiculing atheist who criticises believers because they can't prove their God exists.

The Guardian's explanation of the idea, which apparently quotes the author of the paper directly, makes it sound a much more implausible idea, as it would appear to allow for memories to be created but subsequently erased:

He argues that quantum mechanics dictates that if anyone does observe an entropy-decreasing event, their memories of the event "will have been erased by necessity".

Maccone doesn't mean that your memories will never form in the first place. "What I'm pointing out is that memories are formed and then are subsequently erased," he tells me.

When you observe any system, according to Maccone, you enter into a "quantum entanglement" with it. That is, you and the system are entangled and cannot properly be described separately.

The entanglement, Maccone says, is between your memory and the system. When you disentangle, "the disentangling operation will erase this entanglement, namely the observer's memory". His paper derives this conclusion mathematically.

Yes, the Guardian's headline for the report appears most apt then: "Is quantum mechanics messing with your memory?" But are they quoting him accurately?