New posts in Diffeomorphism Invariance

Covariance in special and general relativity

Is the FRW metric physically distinguishable from a metric with a speed of light that changes over time?

Conformal transformation vs diffeomorphisms

In general relativity, are two pseudo-Riemannian manifolds physically equivalent if they are isometric, or just diffeomorphic?

Why are the metric and the Levi-Civita tensor the only invariant tensors?

What is the purpose of emphasizing that an action is invariant under diffeomorphism?

Diffeomorphism group vs. $GL(4,\mathbb{R})$ in General Relativity

Are diffeomorphisms a proper subgroup of conformal transformations?

The Role of Active and Passive Diffeomorphism Invariance in GR