What is the conflict between quantum mechanics and relativity theory
that I have heard about?
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.
jasjeet s bagla
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Update: June 2012