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I will review how massive black holes may have formed in the earlyuniverse from stellar-mass black hole remnants, via super-Eddingtonaccretion, or run-away mergers of stellar-mass objects. I will thendiscuss the role of circumbinary gas in mergers of black holes: forfacilitating (or not) the early inspiral, producing uniqueelectromagnetic signatures, and impacting low-frequency gravitationalwaves.More details: https://www.simonsfoundation.org/event/cca-colloquium-zoltan-haiman/Uploaded 23-10-19 Learn more about your ad choices. Visit megaphone.fm/adchoices
