Theorie:Seminare+Veranstaltungen in diesem Semester

Superselection sectors, whose analysis is one of the major achievements of local quantum physics, have been approached in several ways, depending on the spacetime and the criterion of interest. In the present talk we give a general scheme to define sectors, independent of the above choices. The input is given by a family of spacetime regions, where the sectors are supposed to be localized, and a factorial Haag-Kastler net fulfilling relative Haag duality on such regions. The output is a superselection structure localized on regions of the given family, covariant with respect to spacetime symmetries preserving the regions themselves.
Our scheme is based on the notion of covariant cohomology of a Haag-Kastler net, and covers all the types of regions previously considered both in (4d) Minkowski space and in curved spacetimes. Moreover, it allows detection of topological phenomena as the Aharonov-Bohm effect. Hypercones (used by Buchholz and Roberts in the massless case) fit our scheme, yet the energetic aspects are the subject of a work in progress with D. Buchholz.
Joint work with F. Ciolli and G. Ruzzi http://arxiv.org/abs/2306.08449


	April 2024

Mo	08.04.2024 Seminarraum A.03.101 Theoretische Physik
14:15	Quantenfeldtheorie (Forschungsseminar M.Phy.412) Emre Artan Göttingen Representation theory and anomalies Kontakt: K.-H. Rehren

Do	11.04.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Aritra Bose Anomalous fluctuations in active matter condensate Kontakt: Peter Sollich

Do	18.04.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Gabriel Knotz ITP, Göttingen Mean Back Relaxation for Position and Densities Kontakt: Peter Sollich

Do	25.04.2024 SR 4, A04.101 Theoretische Physik
14:15	BornHilbertSeminar Ezio Vasselli Roma Superselection sectors and the cohomology of Haag-Kastler nets Abstract Superselection sectors, whose analysis is one of the major achievements of local quantum physics, have been approached in several ways, depending on the spacetime and the criterion of interest. In the present talk we give a general scheme to define sectors, independent of the above choices. The input is given by a family of spacetime regions, where the sectors are supposed to be localized, and a factorial Haag-Kastler net fulfilling relative Haag duality on such regions. The output is a superselection structure localized on regions of the given family, covariant with respect to spacetime symmetries preserving the regions themselves. Our scheme is based on the notion of covariant cohomology of a Haag-Kastler net, and covers all the types of regions previously considered both in (4d) Minkowski space and in curved spacetimes. Moreover, it allows detection of topological phenomena as the Aharonov-Bohm effect. Hypercones (used by Buchholz and Roberts in the massless case) fit our scheme, yet the energetic aspects are the subject of a work in progress with D. Buchholz. Joint work with F. Ciolli and G. Ruzzi http://arxiv.org/abs/2306.08449 Kontakt: K.-H. Rehren

Do	25.04.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Kristian Blom Max-Planck-Forschungsgruppe Mathematische Biophysik Correlation effects in a non-reciprocal Ising model Kontakt: Peter Sollich


	Mai 2024

Do	02.05.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Juliana Caspers tbc Kontakt: Peter Sollich

Do	09.05.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics No seminar today No seminar today Kontakt: Peter Sollich

Do	16.05.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Felix Tippner tba Kontakt: Peter Sollich

Do	23.05.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Srikanth Sastry tba Kontakt: Peter Sollich

Do	30.05.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Muhittin Mungan tba Kontakt: Peter Sollich


	Juni 2024

Do	20.06.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Reimer Kuehn tba Kontakt: Peter Sollich

Mi	26.06.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Wade Hodson tba Kontakt: Peter Sollich


	Juli 2024

Do	04.07.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Jacopo Romano tba Kontakt: Peter Sollich

Do	11.07.2024 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Mike Chatzittofi tba Kontakt: Peter Sollich