Workshop »Interplay of quantum information, foundations and gravity« Mitschnitt einer Veranstaltung des Institute for Quantum Optics and Quantum Information (IQOQI) am Donnerstag, dem 31. Mai 2018 im Theatersaal der Österreichischen Akademie der Wissenschaften Teil 20: Alessio Belenchia: Entropy for Quantum Fields on Discrete Spacetime Kamera: Augustin Vanrietvelde Schnitt: Daniel Winkler Alessio Belenchia ist Postdoktorand am Institut für Quantenoptik, Quantennanophysik und Quanteninformation in Wien. Abstract: In this talk the concept of Sorkin entropy, a covariant generalization of the usual entanglement entropy in QFT, will be introduced. It will then be used to show the difficulties in defining entropy when continuum spacetime is replaced by a discrete partial order, i.e., a causal set. Divergences of the entropy, related to "completely classical" components of the Wightman function, as well as the physical meaning of a double cut-off procedure leading to the expected area-law in the continuum limit, will be discussed. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. The cube of theories 00:00:08 3. Entanglement entropy in quantum field theory 00:03:35 4. Causal set theory in a nutshell 00:11:25 5. Quantum field theory on the nutshell 00:15:49 6. Covariant entropy in causal set theory 00:20:45 7. Conclusions 00:41:35 8. Questions from the audience 00:44:07

Quantenfeldtheorie, Kausalität, Entropie

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(c) Österreichische Zentralbibliothek für Physik