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## Main Question or Discussion Point

I've got two questions here

1a What is the definition of an event horizon of black hole? In Carroll, he defines an event horizon as a boundary of causal past of future null infinitiy. What is the physical interpretation of that?

1b What is the difference between event horizon and Killing horizon? In static asymptotically flat, it seems to be the same thing right?

2 Is there any relevant between Rindler metric and surface gravity? I've seen that if the metric near the horizon can be approximated as a Rindler metric, then we get the entropy of the horizon. What does this mean?

1a What is the definition of an event horizon of black hole? In Carroll, he defines an event horizon as a boundary of causal past of future null infinitiy. What is the physical interpretation of that?

1b What is the difference between event horizon and Killing horizon? In static asymptotically flat, it seems to be the same thing right?

2 Is there any relevant between Rindler metric and surface gravity? I've seen that if the metric near the horizon can be approximated as a Rindler metric, then we get the entropy of the horizon. What does this mean?