but scientists are attempting to apply them to the real world through black holes
that's the point i've been making
Somehow we've transitioned from the Big Bang to black holes, but the same principles apply.
General relativity is a classical field theory that describes space and time through a gravitational field. Field theories propose that matter interacts with a field, such as a gravitational field or electric field, instead of interacting directly with other matter. General relativity is classical in the sense that it does not account for quantum mechanical effects; therefore, we might expect that general relativity does not apply (breaks down) in the realm of subatomic particles or minuscule time scales. The black hole singularity appears because we're applying general relativity in a realm where quantum mechanical effects are present. There is no physical evidence that supports the singularity and the current state of research involves building a theory of general relativity that includes quantum mechanical effects so that the theory does not produce a singularity.Last edited by pleaserecycle - on 16 January 2018