Three Lectures On Complexity And Black Holes by Leonard Susskind

A concise exploration of how quantum computational complexity illuminates black hole dynamics and holography, introducing circuit complexity for many-body quantum states and proposing a “second law of complexity” that provides an arrow of time. It connects the linear growth of complexity to the expansion of wormhole interiors through the complexity=volume/action ideas, and examines scrambling, shockwaves, and switchbacks. Through thought experiments like Hayden–Preskill, it clarifies the practical limits on decoding information from Hawking radiation and the implications for the information paradox and ER=EPR.

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