Can any physicist tell me what Gravity is?

gravity = ~ 9.8m/s acceleration of nongasses without resistance in 90degree angle vector of level water reference

Gravity isn't real OP, the flat earth is simply hurtling up in space at 9.81 m/s2

So what do you think the isometry group of Minkowski space is?

Just the Lorentz group.

>en.wikipedia.org/wiki/Isometry_group
>"The isometry group of Minkowski space is the Poincaré group."

Oh shit you're right. Thought isometry means inner product preserving instead of just metric preserving.

How do I know you're a brainlet?

the better question is what is what?