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chullyman t1_ivxy1ta wrote

Reply to comment by BioTechproject in A first-of-its-kind experiment simulating the cosmos with ultracold potassium atoms suggests that in a curved, expanding universe pairs of particles pop up out of empty space by marketrent

My understanding of this was that there was some kind of bias to pull antimatter in over the event horizon, shrinking the black hole. Although I don’t understand how’s it works. Am I wrong to make this assumption?

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BioTechproject t1_ivyf89v wrote

There is no bias, gravity [unlike other forces] does not discriminate between particles and anti-particles [they have positive mass after all].

Simply because 2 particles are created out of the field at the event horizo, the black hole looses the energy/mass [as they are interchangeable] of 2 particles. However since it can suck one of them right in (doesn't matter which) it can gain the energy of 1 particle back, while the other is ejected. Hence it has lost the energy of 1 particle.

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chullyman t1_ivyh97g wrote

> 2 particles are created out of the field at the event horizo, the black hole looses the energy/mass [as they are interchangeable] of 2 particles.

If the particles are created outside of the black hole, at the event horizon. How is it the black hole losing mass? These particles did not originate from the blackhole, they originated in the space many miles away from the blackhole. From my understanding of what you said the blackhole would be purely gaining mass.

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BioTechproject t1_ivytlf0 wrote

everthying that is inside the event horizon is automatically part of the black hole, as nothing sub-light can escape. Since the particles are created at the boundary, one can be barely on the inside while the other is barely on the outside. The one outside can escape while the one inside is doomed. Since the energy comes from the point at the exact boundary, which is part of the black hole, it looses that energy and thus mass.

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