Undergrad Experimental evidence of the existence of an event horizon

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Experimental evidence supports the existence of a Photon Sphere, but there is no clear, unequivocal evidence for an Event Horizon. The LIGO data is considered the best evidence available, although it varies based on the specific features of the Event Horizon being tested. While there are electromagnetic radiation signatures consistent with General Relativity from inside the Photon Sphere, direct evidence of an Event Horizon remains elusive. Localizing gravitational wave emissions is debated, but the area inside the Photon Sphere is relevant for emission models. The discussion has been concluded and the thread is temporarily closed for moderation.
Bosko
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Is there experimental evidence of the existence of an Event Horizon ?
There is good enough experimental evidence for the existence of a Photon Sphere.
Is there clear unequivocal experimental evidence for the existence of an Event Horizon ?
 
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"Good enough"? The lIGO data is probably providing the best evidence. It depends on what EH feature you want tested.
 
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There is no direct evidence of the existence of an event horizon, and there never can be. There is evidence of EM radiation signatures from inside the photon sphere which is consistent with GR. Localising GW emission is a somewhat dubious thing, but the region inside the photon sphere contributes to our models of emission, so they test that region.
 
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Thread closed temporarily for Moderation...
 
The OP question has been answered. Thread will remain closed.
 
In this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to keep the arrow pointed in the same direction How does he do this ? Does he use a reference point like the stars? (that only move very slowly) If that is how he keeps the arrow pointing in the same direction, is that equivalent to saying that he orients the arrow wrt the 3d space that the sphere is embedded in? So ,although one refers to intrinsic curvature...

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