In quantum gravity, people are arguing about firewalls. Are black hole horizons hot or not?
Both sides argue with what happens behind the horizon. Yes, "behind" it. Of course, behind a horizon there is whatever you want. Behind a horizon there is only religion. Behind a horizon or outside the universe is the same. Whatever one says about it, it is nonsense.
I am missing a simple and clear discussion on whether a Rindler horizon is hot. That would be refreshing and clarifying.
But reading papers that use unproven conjectures in non-existing regions to make either one point or another shows only one thing: quantum gravity is mainly a belief system.