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Speaker: ​Sanjay Moudgalya (Tata Institute of Fundamental Research)Symmetries in quantum many-body systems are typically characterized by their algebraic structure. In this talk, I will show that for continuous symmetries such as U(1) and SU(2), there are underlying quantum geometric structures that play central roles in many-body dynamics. We demonstrate this in noisy Brownian models of unitary quantum dynamics, focusing on entanglement entropies and correlation functions. By mapping the disorder-averaged late-time dynamics to the low-energy physics of effective replica Hamiltonians, we show that the dynamics is governed by the quantum geometry of their ground-state manifolds. This geometry is, in turn, directly related to that of the k-commutants—the symmetry algebras acting on k replicas of the system—and is independent of microscopic details of the noisy evolution. This perspective enables simple geometric derivations, based on the time-dependent variational principle (TDVP), of several characteristic dynamical phenomena, including sub-ballistic Rényi entanglement growth and the anomalous decay of non-hydrodynamic correlators in interacting systems with continuous symmetries. We compare these behaviors across interacting systems with Abelian and non-Abelian continuous symmetries, as well as free-fermion systems, whose distinct dynamics can be traced to differences in the geometry of their k-commutants. More broadly, these results establish a geometric framework for systematically understanding observables and universal dynamical behavior in noisy quantum systems with continuous symmetries.

Speaker: ​Aleksandar Ivanov (University of Vienna)​Abstract: The orbifold construction is a procedure that constructs new QFTs from old ones given a particular algebraic input. I will review aspects of the construction in the most well-understood case of TQFTs, where we think of the construction as gauging discrete symmetries, and then I will present a framework that algorithmically generates the required algebraic data called bistellar data. The benefit of the framework is that it gives an immediate description of the algebraic data in any dimension, as well as a description of bistellar bimodules and all further higher cells, which should describe the symmetries of the new theory.

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Speaker: ​Guglielmo Lockhart (University of Bonn)​Abstract: TBA

Quantum Timekeeping, a simple story of atoms and photons, by Davide Calonico, Scientific Director of INRIM About the lectureHow an Atomic clock is able to beat with an attosecond precision? May clocks measure tides? What time is it on the Moon? How can we stop and cool atoms with lasers? Is the definition of the unit of time the second still satisfactory? These questions, and many more, concern one of the most precise quantum technologies developed by humankind, the exploitation of the quantum structure of atoms with atomic clocks. In the lecture, we will illustrate the fundamentals of atomic timekeeping, following the key advances in science and technology that led to present accuracy of one attosecond. As well we will describe how precise clocks contribute to science and modern society, from testing the standard model of particles to general relativity, from pervasive technologies like satellite navigation and telecommunication to timestamping of financial transition. We will talk a bit on modern laser cooling techniques, the possibility of using nuclear clocks, the miniaturization of clocks with nanotechnologies and last, we will discuss the roadmap towards the new definition of the unit of time in the International System of Units in the Convention of the meter, in a journey embracing the last 70 years of our everyday life. Last, the roadmap of the redefinition will bring us to touch other quantum technologies: the relevance of coherent interferometry on optical fibers, hence the possibility to have time and quantum communication on the same optical fiber, enabling infrastructures like the Italian Quantum Backbone and the European Quantum Communication Infrastructure (EuroQCI).About the speakerDavide Calonico is the Scientific Director of INRIM, Istituto Nazionale di Ricerca Metrologica, an Italian Public Research Institute that is also the Italian Institute of Metrology in the convention of the Metre.  DDC is a physicist expert in primary metrology and quantum technologies. Its main scientific achievements are in atomic clocks, sensing, and quantum communication over fiber. DC coordinates the Italian Quantum backbone, that realizes in Italy the European Quantum Communication Infrastructure of the European Commission. He is the scientific responsible for INRIM of the infrastructure Piquet, Piemonte Quantum Enabling Technology, devoted in INRIM to metrology on a chip. He developed several atomic clocks based on laser-cooled atoms like Cesium Rubidium, Ytterbium, and Strontium, and microstructured clocks based on nanotechnologiesThe event is organized by Aglae Pizzone

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Mød den anmelderroste britiske forfatter Zadie Smith på SDU mandag den 5. oktober til en samtale om hendes forfatterskab og oplæsning fra udvalgte værker.

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About the lectureThe role of predation in the microbial world is like that in the macroscopic world: it makes energy flow to form food webs, regulates prey population, and is a source of biodiversity. However, mechanistically, predation operates very differently since in the microbial world viscosity impedes predator-prey contact, there is no vision to facilitate prey (and predator) perception, and observed behaviours are often counterintuitive. I will demonstrate how planktonic predators, from few micron-sized nanoflagellates to mm-sized copepods, have overcome the impeding effect of viscosity by a fascinating diversity of adaptations, and how microbial predators have balanced the fundamental problem of eating without themselves being eaten. I will show how this trade-off has driven an evolutionary arms race between diatoms and copepods with important consequences for the biological carbon pump. Finally, I will describe how the functional diversity of foraging in flagellates provides a new lens through which to explore early eukaryotic evolution. The presentation will be light on physics and rich in videos and animations.About the speakerThomas Kiørboe is a professor of Biological Oceanography at DTU Aqua. He has been the founder and leader of VKR centre of excellence Centre for Ocean Life (2012-2024) (www.oceanlifecentre.dk) and leader of a Research network (Trait-based plankton ecology, 1993-2013) supported by the Danish Research Council, and head of section at DTU Aqua (2008-13). His research interests span plankton ecology and biogeography, small-scale biological-physical interactions, microbial ecology, trait-based ecology, marine snow, and early eukaryotic evolution. He has been a visiting professor at MIT, UC Berkeley, and CSIC in Spain, and an adjunct professor at SDU (2006-2010). He is an Elected Fellow of Royal Danish Academy of Science and Letters and The Danish Academy for Technical Sciences, and the recipient of multiple national and international awards and accolades, including the AG Huntsman award and the Carlberg Foundation research prize.The event is organized by Donald Canfield

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About the lecture:Humans have introduced a huge array of novel chemical and material pollutants into the Earth system, and continue to do so at an ever-increasing scale.  Humanity’s pollution disrupts Earth system processes, and the stream of novel pollutants flowing into Earth’s environment poses a constant threat of new planetary-scale impacts.  This lecture provides a summary of nearly 15 years of evolution of ideas about how to confront risks and threats from planetary-scale pollution on Earth, and about a new initiative to extend those principles to protection of the moon, Mars and other celestial bodies where humans explore, visit, and may eventually colonize.About Matthew MacLeodMatthew MacLeod is Professor of Environmental Science at Stockholm University, Sweden, and Deputy Dean of Earth and Environmental Science.  He is a Fellow of the Royal Society of Chemistry (FRSC) and is currently Sweden’s “Designated Expert” on Persistent Organic Pollutants for the Arctic Council’s Arctic Monitoring and Assessment Programme (AMAP). He holds a Bachelor’s degree from the University of Victoria (Canada), and Master’s and PHD degrees from Trent University (Canada). Prior to moving to Sweden in 2010 he was a post-doctoral researcher at the Lawrence Berkeley National Laboratory (USA) (2002-04) and a Research Group Leader at the Swiss Federal Institute of Technology (ETH) in Zurich, Switzerland (2004-10). Professor MacLeod uses mathematical models and data analysis to study the factors that control human and environmental exposure to environmental contaminants, and the links between the three dimensions of the “triple planetary crisis” of pollution, climate change and biodiversity loss. The goal of his research is to build a quantitative understanding of humanity’s impacts on the Earth system, and to develop practical tools and guidance to support rational decision-making.The event is organized by DIAS Chair Zhanyun Wang

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About the lecture:The concert and lecture will present 300 years of musical history through compositionsfrom the vast and rich piano repertoire. Masterpieces by Johann Sebastian Bach, Ludwig van Beethoven,Franz Liszt, and Claude Debussy will be performed and analysed to deepen both ourunderstanding and emotional perception of the music. Birch’s Astronomic Piano Pieces willtake the audience on a journey into space, thereby demonstrating a highly interesting, innovative,and unorthodox approach to music-making.All aspects of this remarkable instrument and its many possibilities will be explored — notonly the music itself, but also the piano’s technical development in relation to broader politicaland cultural movements throughout history.About the speaker:SVEN BIRCH was born in Denmark and studied piano at the DJM in Aarhus, where he graduated with a soloist diploma. Thanks to numerous scholarships, he was able to continue his studies in Vienna with Prof. Alexander Jenner. In addition, he attended masterclasses with renowned pianists such as Tatiana Nikolayeva, Conrad Hansen, John Lill, and Peter Feuchtwanger.As a sought-after pianist, Birch possesses an extensive repertoire ranging from the Renaissance to contemporary music. He is active as a soloist, chamber musician, accompanist, and composer, and has performed throughout Europe, North and South America, and Asia. Among his major projects is the performance of the complete cycle of Beethoven’s 32 piano sonatas.Since 1992, Professor Sven Birch has been teaching at the Anton Bruckner Private University in Linz. From 1996 to 2004, he also taught at the Mozarteum University in Salzburg.He is a member of the George Crumb Trio Linz and the Georgiadis-Birch flute and piano duo. He regularly conducts concerts and projects, and he serves as the conductor and artistic director of the ensemble Lézard aux Plumes in Linz.He is frequently invited to give masterclasses and workshops (Sibelius Academy Helsinki, Chopin Academy Warsaw, Royal Academy Manchester, as well as universities in Buenos Aires, Rio de Janeiro, Beijing, Riga, Tallinn, Aarhus, Rome, Milan, and Seville) and has produced numerous CD, television, and radio recordings.The event is organized by Anne-Marie Mai & Andreas Birch

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