"Modern physics relies on different, but equally important, frameworks. One is Albert Einstein's theory of general relativity, which describes the gravity and motion of large objects such as planets. Another is quantum mechanics, which rules the microcosmos of atoms and particles. And on an even larger scale, the standard model of cosmology describes the birth and evolution of the universe as a whole. All rely on time, yet they treat it in incompatible ways."
"When physicists try to combine these theories into a single framework, time often behaves in unexpected and troubling ways. Sometimes it stretches. Sometimes it slows. Sometimes it disappears entirely. Einstein's theory of relativity was, in fact, the first major blow to our everyday intuition about time. Time, Einstein showed, is not universal. It runs at different speeds depending on gravity and motion."
Time appears as an irreversible flow from past to future that organizes experience and planning. Physics uses multiple core frameworks — general relativity for gravity and large-scale motion, quantum mechanics for atomic and particle behavior, and the standard cosmological model for the universe's origin and evolution. Each framework presupposes time but treats it differently, and attempts to unify them lead to paradoxical behavior in time itself. Time can stretch, slow, or cease to appear in combined frameworks. The relativity of time under gravity and motion places the nature of time at the center of unresolved foundational problems in physics.
Read at theconversation.com
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