Okay, having seen Arrival, I read Ted Chiang's "Story of Your Life," on which it's based. Good story, and I get why the physicist is there.
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The physicist realizes that the principle of least time (or action) is intuitive to heptapods. They experience time globally, not locally.
When I read the story, I wondered how they could possibly convey that crucial point in the movie. And, of course, they didn't...
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What I most enjoyed about the story was realizing that I couldn't convincingly disprove the premise (a conscious global view
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of time). Of course, Chiang's mechanism is very vague, but the broad possibility seems hard to rule out to me. A variant of the
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arrow of time problem.
End of conversation
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