Are all the (measurable) dimensionless parameters that characterize the physical universe calculable in principle or are some merely determined by historical or quantum mechanical accident and incalculable?

— David Gross, Problems for the Next Millennium (2000)

Source: https://theory.caltech.edu/~preskill/millennium.html

From 'Problems for the Next Millennium', Strings 2000, University of Michigan.

Topics: physics