Recent content by ddjj77

It's baffling how something can change shape without moving.

Mass causes space to change shape, and that's what we see as gravity. But does space move when it changes shape? If yes, relative to what?

Good point. How about an electrical current in a one-atom thick conductor. As far as I can remember, it's not the same electron that went into one end of the wire that exits the other end. The entering electron causes the stationary electron in the first atom to jump to the next atom. In that...

Like zero speed means no motion. Maybe there's no such thing as zero time. Maybe the shortest time is Planck time? I'll accept your view for now.

Doesn't zero time mean never?

So, if a particle has a finite size (Planck diameter?), it would take a finite time for it to enter into and exit from position X, therefore it has been at position X?

My opening was the question if being at a position for zero time amounts to having been at that position at all.

That's my position too, but I want to find out if that's true. Has the particle been at any position? Maybe the answer is in Heisenberg's uncertainty principle. If the particle is moving, then we can know its momentum, but not its position.

Why fields and not positions? Fields are infinite. A moving particle has varying positions and has been at infinite positions for zero time at each position.

"From the physics perspective, another resolution is to notice that the notions of an infinitely precise "position" and a continuous "path" are not physically realized in the first place." I assume that speed would also not be physically realized? But momentum would be?

Oops, thanks for noticing that.

I need help with understanding this: "The current standard treatment or so-called "Standard Solution" implies Zeno was correct to conclude that a runner's path contains an actual infinity of parts at any time during the motion, but he was mistaken to assume this is too many parts." (From...

"was only there momentarily" So momentarily and zero time are equivalent?

A moving particle has been at position X for zero time. Was it ever at position X? Can zero time be considered as never, as in "I was in Rome for zero amount of time."? It seems like it would have been at position X if time passed in pieces the size of Plank time.

Good points. Thanks.