Sagittarius A-Star's latest activity

For geometric intuition: In Geometric Algebra, the electromagnetic bivector can be written in the following way as the sum of a...

Sure, that is a matter of definitions and categories. Nevertheless, the tidal force is the physical part of gravity, the part that does...

I think in GR tidal gravity, it just has to be small enough and insensitive enough.

Is it a matter of adoption of a definition, what a true force is? I think a true force can be measured with an accelerometer.

Why? I think a true force creates a deviation from the geodesic.

I don't think so. If for example an asteroid breaks in tidal gravity, the related forces are electrical forces between parts of it.

As an interesting(?) aside, we can "pick out" the magnetic force for a particular observer in a manifestly covariant way (I know this...

This video shows, how to use ##\LaTeX## in MS word.

This is not a full solution for problem (3b), but maybe a useful hint. When I substitute the RHS of (3b) into (3a), the two...

I think there's a subtlety here. ##U## is the 4-velocity of an observer at rest in the chosen frame. A charge at rest in the same frame...

Additional insight: The 4-vector ##E_{\vec U}^\alpha## from problem (3a), multiplied with charge ##q##, gives the Lorentz 4-force on a...

All of this is very helpful indeed! I'm going to try to work through the details on my own, so that I make sure I really understand and...

Apologies for the delay, but I'm still getting used to LaTex. Anyway, in answer to how I got to the expression(s) that left me stuck...

There is a Levi-Civita tensor ( https://en.wikipedia.org/wiki/Levi-Civita_symbol#Example:_Minkowski_space ), which is the volume element...

The following refers to special relativity. It is sufficient to prove the validity of the equation of part (b) in only one basis. This...