geordief

that's an unnatural diet.

Seems like an interesting story " Instead of regularly repeating rows of atoms, a time crystal would exhibit regularly repeating motion." https://www.newscientist.com/article/2119804-worlds-first-time-crystals-cooked-up-using-new-recipe/ http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.030401

So is there a relationship between mass and the stress tensor? (It is the stress-momentum tensor ,is it? )