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We can't observe any matter inside black hole, why do we still see gravitational pull from that matter?

It is obvious that you need a gravitation well to have a black hole, but it's not obvious why the gravitational pull will still be there once event horizon is formed and black hole contents (singularity?) are no longer observable.

If an event horizon of a black hole does indeed have innate gravitational pull, does the same apply to event horizon of observable universe? There's matter behind observable universe event horizon, do we get pulled towards it? If not, why not? If yes, how strong is this effect?

Qmechanic
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alamar
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1 Answers1

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It is very important to understand the difference between static field and the EM waves of Gravitational waves.

Black holes do have static fields around them, they can have EM charge (a static EM field) and a gravitational field around them, outside the horizon.

To have the static fields around them, BHs do not need to send any information nor particles from inside the horizon. No real photon or real graviton needs to be sent from inside the horizon. So no particles need to be sent from inside the horizon.

No information needs to be sent from inside the horizon either, because the information about the static fields (EM and gravitational) is all on the horizon.

How does gravity escape a black hole?

Árpád Szendrei
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