AI-powered
podcast player
Listen to all your favourite podcasts with AI-powered features
The Feynman's Sum Over History and the Path Integral
Modern physics views the world as various types of fields, which vary continuously. That would be true if the world were described by a classical field theory but it is not. It is described as far as we know by quantum field theories. So you can't just think of it as smooth fields rather than ones that have discontinuities all over the place. And these ideas of continuity only make sense if you think that the field has definite values at different points in space; they don't.