The discussion centers around the phenomenon of time dilation at the event horizon of black holes and how this relates to the observation of accretion processes. Participants explore the implications of time dilation on the visibility of objects falling into black holes and the growth of black holes over time, touching on theoretical and observational aspects.
Participants exhibit a range of views on the visibility of accretion and the implications of time dilation, with no consensus reached on the nature of time or the observational consequences of black hole accretion. The discussion remains unresolved regarding the philosophical implications of observation and measurement in this context.
Some claims rely on specific definitions of time and measurement that may not be universally accepted. The discussion includes speculative elements about the nature of black holes and the effects of gravitational time dilation, which are not fully resolved.
Is the minimum difference between the times you mention effectively zero? Does the black hole mass matter to any significant degree? Just curious if it's an extended event for the observer or if it's also effectively instantaneous.Nugatory said:However, there is a time in your reference frame such that if you send a radio message to the poor guy falling into the black hole before that time he will be able to to reply to it; but after that time although your message may reach him, he will be unable to reply to it because he will be inside the horizon by the time it reaches him. There is also a later time such that if you don't send your radio message before that later time it will never get to the infaller because he'll have reached the central singularity before the message gets to him.