r/tenet

I know movies hit everyone differently, but have any of you thought about the friendship between John David Washington's The Protagonist and Robert Pattenson's Neil? I don't know if I've come across a friendship more powerful in film, save possibly Sam and Frodo. The ending I find powerfully bittersweet, specifically the moment when The Protagonist realizes what the shape and color of that friendship is near the end of the film.

I'm truly curious if anyone else has thought about this, and what your thoughts are.

Unsure how to tag this

Imagine: uninverted object A generates and emits heat. Uninverted object B also generates and emits heat. How this occurs does not matter, whether it is by radioactive decay, battery operated resistive heating, etc. Suppose B is inverted. From the uninverted A perspective, B is now un-generating and un-emitting heat. From the inverted B perspective, the same is true of A.

Now what happens when the two touch?

A wants to transmit heat into B, since it is hot. This adds energy to B in the forwards direction of time, allowing A to cool towards the future. From B's perspective, A is ripping heat away from it. This means that B cools towards the past. B cooling towards the past means it is heating towards the future.

Given that B will appear cold to the univerted world, this means that the two objects will approach an equilibrium temperature (towards the future) despite both being heat generating objects. Which generator is stronger will affect the equilibrium temperature; the sun emits far more heat than a human. Thus, an inverted human will heat up towards the future, and the sun will effectively not cool. To the inverted human, it would thus feel like the sunlight is cooling them, as is accepted by some.

My initial assumption before working through the thought experiment was that the objects would both heat towards infinity in their respective directions, which may be the cause of annihilation (via burning, melting, or otherwise structurally failing). Alas, not meant to be.

I know this is unnecessarily technical and a waste of time, but I still think it is quite cool.