Roberto Pavani's latest activity

Gravity, of course, is not fictitious because the Riemann curvature is a tensor. But gravity is not the same thing as gravitational...

Fair point. I should have said 'gravitational force', not 'gravity'. The distinction is precisely the one between Christoffel symbols...

You're right, I misused the term 'hierarchy problem', that's about the coupling constants in the action, not about cosmological...

@Demystifier's observation kept buzzing in my head and produced the following thought: Gravity is fictitious only to first order. In...

We know that gravity is much weaker than electromagnetism at the particle level (~10⁻³⁶ ratio). Yet gravity is the dominant interaction...

Undergraduate answer to an undergraduate question: matter is anything that has inertial mass, i.e., anything that resists acceleration...

No personal theory needed. My argument rests on one principle: all observers must agree on physical events. The water being on the...

You're right that coordinate velocities in rotating frames can exceed ##c##, that's just a coordinate artifact. But Mach's principle...

That would be assuming Mach's principle to defend Mach's principle, seems circular. Moreover, GR is built on the equivalence principle...

No personal theory needed, just Newton's second law. The centrifugal effect in a rotating frame is ##F = m\omega^2 r##. This expression...

Mach3 states: "The local inertial frame is completely determined by the matter distribution of the universe." This is precisely what my...

It comes directly from the meaning of "relative." If rotation is purely relative (as Mach claims), then "A rotates w.r.t. the universe"...

Thank you, but I think the argument is being missed. The point is not about the gravitational effect of one bucket on the other; it's...

Good question. The key difference is: When we observe stars rotating from Earth, we know it's a coordinate effect — we can detect...

Watching a YouTube video about Newton's rotating bucket vs Mach's principle, a simple variant came to mind that I haven't seen...