I always wondered, what if there is "life" that exists going backwards in time? Like, consider our laws of physics, except entropy is decreasing. Imagine a "life form" which interacts with the world, grows, replicates, and evolves backwards in time. So to us, it would seem to start out as a massive colony, then shrink and devolve. To them, we would seem the same.
How would you even detect them? Communicate with them? You can't just send a message, because they would instantaneously "forget" it (since they process information backwards), and vice versa. I doubt we could consider them "alive" at all.
Also, their laws of physics would be so different. Imagine shards of glass, at rest on our world, suddenly start joining together into a glass bottle. That's what life looks like to them.
Yet everything else is the same. They live in the same, the same laws of physics. They could even exist on our planet. Except we exist in a state of increasing entropy, and they exist in a state of decreasing entropy.
An intelligent being in a 'state' of decreasing entropy seems a little difficult to imagine.
Much more realistic, IMO, would be a civilization that was made entirely of dark matter. Perhaps they might be able to infer our existence if we built some insanely powerful particle accelerator (and vice versa). If not then we would presumable only be able to communicate through gravitational effects...
The question isn't whether life could exist in a reversed universe, but whether this universe could exist in slices within ours like in the movie Tenet.
its possible but since we are in very very very early (think 10E9 out of 10E100) stages of our universe I'd imagine the reverse part would happen towards the end of our current time, assuming the time reversed processes have same endpoints as time fwd processes.
How would you even detect them? Communicate with them? You can't just send a message, because they would instantaneously "forget" it (since they process information backwards), and vice versa. I doubt we could consider them "alive" at all.
Also, their laws of physics would be so different. Imagine shards of glass, at rest on our world, suddenly start joining together into a glass bottle. That's what life looks like to them.
Yet everything else is the same. They live in the same, the same laws of physics. They could even exist on our planet. Except we exist in a state of increasing entropy, and they exist in a state of decreasing entropy.