AMA | October 2024

11572.043 - 11595.331 Sean Carroll

And then Einstein's equations become a little bit simpler. You're just setting a certain condition on the curvature tensor of the extra dimensions. R mu nu equals zero for those experts out there. And Calabi-Yau manifolds are curled up kinds of manifolds with R mu nu equals zero. They're the kinds of things that can easily plug in to the string theory equations and get a solution.