Ten years ago, the physics community came to agree that the expansion of the Universe is experiencing a positive acceleration. The experts still disagree on why. Everything but the kitchen sink has been proposed (I’ve mentioned this twice before), but there is a paucity of experimental evidence to favor one proposal over another.
This situation strikes me as a gold-mine for philosophers physics. In particular, I would hope that we could learn something interesting about what kind of reasoning is allowed in such an empirically starved research program. In particular, what I’d like to know is:
What argumentative moves are licit in response to the cosmic acceleration problem?
As a first step toward figuring this out, I made a map of the most common arguments being made. To see my map, click the image on the left (or download the PDF). This map is inspired by a (much smaller) such diagram given by Sean Carroll (2003). Suggestions are more than welcome!
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