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Causality in Special Relativity

Classical Mechanics and Relativity: Lecture 20 Theoretical physicist Dr Andrew Mitchell presents an undergraduate lecture course on Classical Mechanics and Relativity at University College Dublin. This is a complete and self-contained course in which everything is derived from scratch. In this lecture I discuss causality in Einstein's Special Relativity. The concept of cause-and-effect is something that hold true independently of your reference frame, and indeed we see that this is upheld in special relativity. The condition for two events to be in a causal relationship is discussed in relation to the 'light cone' and the invariant spacetime interval. I discuss the meaning of "future" and "past" and how the relativistic speed limit implies a causality "event horizon". Full lecture course playlist:    • Classical Mechanics and Relativity lecture...   Course textbooks: "Classical Mechanics" by Goldstein, Safko, and Poole "Classical Mechanics" by Morin "Relativity" by Rindler