Did Paul Dirac address the matter directly? The Robert Heinlein essay sounds interesting; I'm just confused about why he had to speculate about Dirac's belief. It's not a topic about which I know much.
None of my introductory university physics education mentioned this stuff so I' not really clear on whether it's well-known, unimportant, or something else. I just happened to be reading a big collection of this science fiction author's nonfiction work and that one claim stood out to me as kind of bizarre (G is going ... down?!) and always wondered what the deal was.
