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Descrição: "Irreversibility as “irretrodictability” apresenta a Segunda Lei da Termodinâmica como uma forma de inferência estatística a partir de informações da narrativa iniciada por Watanabe na década de 1960, com Valerio Scarani nos Colóquios Pós do IFGW. Colóquio gravado em 07/10/2021. Valerio Scarani é professor no Centre for Quantum Technologies, National University of Singapore, Singapore. Resumo/Abstract: Both classical and quantum theory hold that every change is reversible at the fundamental level, although we perceive almost everything as irreversible processes. Yet, physicists are not urging to label that perception as illusory: for most, the Second Law of thermodynamics is untouchable, so aberrant the idea of inexhaustible energy is. Building on a narrative pioneered by Watanabe in the 1960s, I shall present an approach to the Second Law as a form of statistical inference given partial information. Irreversibility is unavoidable because it translates the asymmetry between prediction and retrodiction on a given process. This viewpoint applies to both classical and quantum systems. Applied to the “fluctuation relations” that have been the preferential tools to address irreversibility in the last two decades, it both simplifies their derivation and vastly expands their scope. References: F. Buscemi, V. Scarani, Phys. Rev. E 103, 052111 (2021); C. Aw, F. Buscemi, V. Scarani, arXiv:2106.08589 (2021) Playlist dos Colóquios: • Colóquios da Pós-Graduação 2020 à 2022 Inscreva-se no nosso canal e acompanhe as atividades do Instituto de Física "Gleb Wataghin" da UNICAMP. #ColoquioPosIFGW #SegundaLeiDaTermodinâmica #SecondLawOfThermodynamics #IFGWPLAY #IFGW #UNICAMP