Personally I am not aware of any experiments at the LHC or anywhere else, specifically aimed at any particular work on black holes. Certainly some sensationalists have been inaccurately dramatising the hazards of creating a black hole in the LHC, and of the consequences if such a thing were to happen.

Empirically we can tell that either it could not happen, not at any energies accessible to us at present anyway, or that if it does, any black holes created evaporate by Hawking radiation too fast to present any hazard by swallowing adjacent matter or energy.

No current theory that I have heard of suggests that anything in the interior of a black hole can escape the event horizon. What happens in loss of mass-equivalent is slightly subtler; for details you will have to consult the quantum theory textbooks and master their mathematics.

(Remember that everything I say here amounts to handwaving. Arguing about it is pointless, because when you are arguing against a mathematical argument, if you wiah to achieve anything meaningful, you must use the mathematics in question, and that is not what we are doing here.)

To continue the handwaving however, remember that it was mathematically predicted and has been experimentally verified, that the vacuum we call space is full of so-called fluctuations, where particles and antiparticles continually are created and nearly instantly annihilate each other. Under most circumstances they do this too fast to have much obvious effect on the world around us, but under special circumstances funny things may happen.

For example if their trajectory around a black hole is such that one of the particles escapes the black hole, whereas the other falls in, then, because for them both to survive would cause a net increase in the mass-energy of the universe, which is not possible as far as we can tell, the positive energy of the particle that falls into our side of the black hole event horizon must be balanced by negative energy falling into the black hole.

We see this as an apparent emission of particles from the black hole. After all we cannot see what happens on the other side of the event horizon, so it looks to us as though the black hole is spitting energetic particles. Where else could they have come from other than inside the black hole, after all?

But negative energy in the black hole cancels out positive energy in the black hole, reducing the net energy of the black hole. Nothing escapes the event horizon;  it just looks like an escape because mass-energy matching the energy lost inside the black hole appears in the space around the outside of the black hole.

Digest that, and when you have formulated objections or puzzles that occur to you, feel welcome to return and ask for elaborations. We might not be able to help you, but it is good fun!

Go well,

Jon

BLACK HOLE

--James Ph. Kotsybar

Containing nothing that’s ambivalent,

more than dark,

which would only be dreary,

death’s non-spiritual equivalent

crushes our intellect to theory.

Passage through is most certainly

one way,

and thus it incites our speculation.

What would occur,

if we wandered astray into

this singular aberration?

It’s relative

to where you’ve placed your clocks.

From outside,

we’d seem to fall forever.

Beyond that,

it’s puzzling paradox.

We only know

that we’d leave it never.

A downward orbit is how it begins,

and nothing’s jolly when gravity wins.

By the way, there are some scientists who think our universe may be a black hole, or the Big Bang the result of a black hole from another universe.  It would take a very long time to evaporate a typical (naturally occurring) black hole through Hawking radiation, however the type that might be created in the LHC would most likely vanish before they posed any sort of danger to the facility -- much less our planet.