So why have event horizons dominated so much of this discussion - TopicsExpress

So why have event horizons dominated so much of this discussion over the last 40 years? Certainly event hori- zons are known to exist in classical general relativity [20– 26], but they are extremely delicate teleological construc- tions, somehow implicitly “requiring that nature inher- ently tends toward definite ends”. Mathematically, one needs to know the entire history of the universe, all the way into the infinite future, and all the way down to any spacelike singularity, to decide whether or not an event horizon exists right here and now. This makes event hori- zons unsuitable for empirical testing in either laborato- ries or telescopes. In contrast, apparent and trapping horizons are defined using local (or at worst quasi-local) measurements, meaning that they are at least in principle suitable for testing in finite-size laboratories or telescopes. Matt Vissers new paper

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