The unexpected resurgence of Weyl geometry in late 20-th century physics

Understand

Weyl's original scale geometry of 1918 ("purely infinitesimal geometry") was withdrawn by its author from physical theorizing in the early 1920s.

• It had a comeback in the last third of the 20th century in different contexts: scalar tensor theories of gravity, foundations of gravity, foundations of quantum mechanics, elementary particle physics, and cosmology.
• It seems that Weyl geometry continues to offer an open research potential for the foundations of physics even after the turn to the new millennium.