
It is at this point that we should note that by time travel, we’re mostly talking about backwards time travel. The Russo brothers made very little attempt to flesh out the mechanics of how Stark’s time machine worked, but you can’t really fault them for brushing over this as the real-world proposals for time travel are so outlandish as to be purely theoretical. But this isn’t exactly a new criticism of Ant Man’s shenanigans and I was comfortable to ignore it until they tried to use it as a foundation for Endgame’s time travel mechanism.

The very same law that generates these weird quantum properties, that is the Heisenberg Uncertainty Principle, dictates that objects of such size must ‘spread out’ into wavefunctions, which fundamentally changes the way they would interact. As a result, the concept that objects and beings can be shrunk to subatomic sizes and maintain their structural integrity is laughable. It may seem that such small scales behave like another world, but this is just a painful misconception. The problem is that these effects are so small (only being relevant on the scale of atoms) that the world we experience is really well approximated by classical physics. Physically, our entire world is quantum mechanical. The concept of another ‘realm’ existing once you get down to quantum levels is pure fiction. But if its anything like what was presented in Endgame, then it is definitely fanciful. I haven’t seen Ant Man or Ant Man & the Wasp (I don’t really like Paul Rudd at all) so I haven’t poured over the details of the “Quantum Realm”. I’ll try to connect the slightly mind-boggling proposals for real world time travel with the plot of Endgame for you here, and explain where the proposed time travelling works and when it fails dismally. I’ve read quite a few articles trying to explain how the time travel worked in Endgame, however, they all end up creating arbitrary rules disconnected from reality to make it work. Despite my first impressions though, the Russo brothers appear to actually have put some thought into how time travel would work.

Perhaps we’ve been spoilt by the masterpiece that is Interstellar, but the name-dropping of high-level physics concepts to confuse the audience into accepting the time travel mechanism was highly obnoxious.
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Whilst the movie was pretty close to perfect, as indicated by the whopping 9.0 on IMDb, as a physicist I couldn’t help but get distracted and mildly frustrated by the treatment of physics, and in particular time travel, throughout the movie.

With a record shattering $1.2 billion globally on opening weekend, Avengers: Endgame is definitely the talk of the town, overshadowing even the mind-blowing latest episode of Game of Thrones.
