What we don't know about time

Details What we don't know about time What we don't know about time

2011-07-14

arxiv.org/abs/1107.2897v1

Physics

High Energy Physics

High Energy Physics - Theory

15 pages; Essay for a special issue of Foundations of Physics commemorating "Forty years of string theory"

Scientific paper

String theory has transformed our understanding of geometry, topology and spacetime. Thus, for this special issue of Foundations of Physics commemorating "Forty Years of String Theory", it seems appropriate to step back and ask what we do not understand. As I will discuss, time remains the least understood concept in physical theory. While we have made significant progress in understanding space, our understanding of time has not progressed much beyond the level of a century ago when Einstein introduced the idea of space-time as a combined entity. Thus, I will raise a series of open questions about time, and will review some of the progress that has been made as a roadmap for the future.

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