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Question:
What is the conflict between quantum mechanics and relativity theory that I have heard about?


Replies:
According to relativity, the influence of an event can be felt only if you can see the event, and the influence should be felt only after it has been seen. The essential point being that light travels faster than anything else. In quantum mechanics, it can be shown that influence of an event may be felt before a light signal could have reached you from the same event. This is the main problem. In quantum mechanics, you have to specify initial state everywhere and everything in the world effects the evolution of a system. In relativity, only the events within the lightcone effect the evolution.

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