3min chapter

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas cover image

AMA | June 2023

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

CHAPTER

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.

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