It's really trippy to think about how hawking radiation becomes 'real' once its sufficiently 'far' away from a 'strong' gravitational well, and how this can be

It's really trippy to think about how hawking radiation becomes 'real' once its sufficiently 'far' away from a 'strong' gravitational well, and how this can be thought of as a Doppler shift giving real physical presence (in that we can interact and be affected by ) to what was once a 'virtual' particle I think scienceclic does a good job visualizing this, but end of the day I can't see a way to distinguish event horizons regardless if they're a black hole or the distant past/big bang. https://youtu.be/isezfMo8kWQ?si=9wGliV-Qo1bXCTRy https://youtu.be/isezfMo8kWQ?si=9wGliV-Qo1bXCTRy Specifically look at the relativity of the vacuum section, which builds to a great insight at around 5:45