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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250109T160000
DTEND;TZID=Europe/Berlin:20250109T173000
DTSTAMP:20260525T130102
CREATED:20250108T110533Z
LAST-MODIFIED:20250108T110533Z
UID:10002217-1736438400-1736443800@qvls.de
SUMMARY:Preparing for the Thorium-229 revolution - Colloquium by Prof. Gilad Perez\, Weizmann Institute of Science\, Israel
DESCRIPTION:Colloquium by Prof. Gilad Perez\, Weizmann Institute of Science\, Israel \nPreparing for the Thorium-229 revolution \nAbstract: The remarkable precision of optical atomic clocks enables new applications and offers sensitivity to novel and exotic physics. In this talk I will explain the motivation and operating principles of a multiplexed strontium optical lattice clock\, which consists of two or more atomic ensembles of trapped\, ultra-cold strontium in one vacuum chamber. This miniature clock network enables us to bypass the primary limitations to typical atomic clock comparisons and achieve new levels of precision.\nAfter a brief introduction related to ultralight (pseudo) scalar dark matter\, we shall describe the current status of searches for ultralight dark matter (UDM). We explain why modern clocks can be used to search for both scalar and axion dark matter fields. We review existing and new types of well-motivated models of UDM and argue that they all share one key ingredient – their dominant coupling is to the QCD/nuclear sector. This is very exciting as we are amidst a revolution in the field of dark matter searches as laser excitation of Th-229 with effective precision of 1:10^13 has been recently achieved\, which as we show\, is already probing uncharted territory of models. Furthermore\, Th-229-based nuclear clock can potentially improve the sensitivity to physics of dark matter and beyond by factor of 10^10. To what extent we trust this enhancement factor and what are the potential implications will be also briefly discussed. \nAccess data for the transfer:\nZoom Access: https://us04web.zoom.us/j/932734874 \nThis talk is part of the „Virtual Seminar on Precision Physics and Fundamental Symmetries“ series and of the SFB DQ-mat colloquium series:\nhttps://indico.cern.ch/category/12183/ \nPTB Braunschweig\,Vieweg Building\, Room 133
URL:https://qvls.de/event/preparing-for-the-thorium-229-revolution-colloquium-by-prof-gilad-perez-weizmann-institute-of-science-israel/
LOCATION:Physikalisch-Technische Bundesanstalt (PTB)\, Bundesallee 100\, Braunschweig\, 38116\, Germany
CATEGORIES:Forschung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250123T100000
DTEND;TZID=Europe/Berlin:20250123T120000
DTSTAMP:20260525T130102
CREATED:20250120T165606Z
LAST-MODIFIED:20250120T165606Z
UID:10002220-1737626400-1737633600@qvls.de
SUMMARY:Electric Dipole Moments
DESCRIPTION:Lecture by Prof. Dr. Peter Fierlinger\, Technical University of Munich\, School of natural Sciences\, Germany\nLUH\, D326\, Building 1101\, Main Building\, Welfengarten 1\, 30167 Hannover\, Germany \nThe search for Electric Dipole Moments (EDMs) of fundamental systems is ongoing since the 1950’s: an EDM would be a manifestation of physics at very high energy scales\, and would violate P and T symmetry. It has significant impact on our understanding of the early Universe\, in particular the origin of matter-antimatter asymmetry. Key for measurements was the invention of Ramsey’s method of separated oscillating fields. It enabled unprecedented experimental sensitivities\, e.g. 10^-44 J energy resolution in an experiment using the isotope 129-Xe. Many different systems like nucleons\, atoms or leptons are experimentally accessible and complementary in their physics reach. Through relating results from different experiments using effective field theory with each other and also to measurements at higher energy\, EDM searches are among the most powerful tools in particle physics. An overview of the field with current status of joint analyses\, as well as a selection of particularly interesting experimental strategies\, approaches and techniques with emphasis on future potential will be discussed. Direct spin-offs are e.g. searches for ultra-light (axion) Dark Matter\, but also applications in biomagnetic sensing\, as magnetic field measurements are a key technical aspect for most EDM searches. \nAccess data for the transfer:\nZoom Access: https://uni-hannover.webex.com/uni-hannover-en/j.php?MTID=m6ec116567f474c4964975d2a39a35c64
URL:https://qvls.de/event/electric-dipole-moments/
LOCATION:Niedersachsen
CATEGORIES:Bildung,DE
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250123T163000
DTEND;TZID=Europe/Berlin:20250123T173000
DTSTAMP:20260525T130102
CREATED:20250120T165410Z
LAST-MODIFIED:20250120T165410Z
UID:10002219-1737649800-1737653400@qvls.de
SUMMARY:Searching for new physics with new lasing mechanisms and highly charged ions
DESCRIPTION:Colloquium by Dr. Vera Schäfer\, Max Planck Institute for Nuclear Physics\, Heidelberg\, Germany\nPrecision measurements of atomic transition frequencies are a promising path for testing theories for new physics beyond the standard model. To achieve even higher precision more sensitive systems and more stable and narrow-linewidth laser sources are required.\nSuperradiant lasers are a candidate for realising a narrow-linewidth\, high-bandwidth active frequency reference\, by shifting the phase memory from an optical cavity to an ultra-narrow optical atomic transition. Pulsed superradiance on the mHz transition in 87Sr has achieved a fractional Allan deviation of 6.7*10−16 at 1s of averaging. Moving towards continuous-wave superradiance promises to further improve the short-term frequency stability by orders of magnitude\, but requires continuous loading of cold atoms into the strong coupling regime of a cavity.\nWe demonstrate continuous loading and transport of cold 88Sr atoms inside a ring cavity\, as well as the emergence of collective continuous lasing of the atoms on the 7.5kHz transition\, 7x narrower than the cavity linewidth\, and pumped by the cooling lasers via inversion of the motional states. The lasing is supported by self-regulation of the number of atoms inside the cavity that pins the dressed cavity frequency to a fixed value over >3MHz of raw applied cavity frequency. In the process up to 80% of the original atoms are expelled from the cavity.\nIn addition\, I will present a new project in Heidelberg aiming to use simultaneous precision spectroscopy of two highly charged ions (HCIs) to search for a variation of the fine-structure constant α. HCIs have transitions with strongly enhanced sensitivity to α and reduced sensitivity to common sources of systematic errors. By comparing Cf15+ and Cf17+ we will target a sensitivity for a fractional variation of α of 10-20/year. \nPTB Braunschweig\,Vieweg Building\, Room 133 \nAccess data for the transfer:\nZoom Access: https://us04web.zoom.us/j/932734874 \nThis talk is part of the „Virtual Seminar on Precision Physics and Fundamental Symmetries“ series and of the SFB DQ-mat colloquium series:\nhttps://indico.cern.ch/category/12183/
URL:https://qvls.de/event/searching-for-new-physics-with-new-lasing-mechanisms-and-highly-charged-ions/
LOCATION:Niedersachsen
CATEGORIES:Bildung,DE
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250127T143000
DTEND;TZID=Europe/Berlin:20250127T143000
DTSTAMP:20260525T130102
CREATED:20250120T164332Z
LAST-MODIFIED:20250120T164520Z
UID:10002218-1737988200-1737988200@qvls.de
SUMMARY:Relativistic implications of entropy and purity
DESCRIPTION:Space Science @ Drop Tower Seminar by Martin Bojowald and Joseph Balsells (via Zoom)\nIn this seminar\, we will explore the interplay between quantum mechanics and general relativity by examining the behavior of a quantum clock in curved spacetime. Unlike a classical point mass\, a quantum clock with nonzero position fluctuations cannot travel along a single geodesic. Instead\, it behaves as an extended object influenced by tidal forces and a superposition of time dilations at different altitudes. Using a geometrical formulation of quantum mechanics\, we will show that quantum correlations between spatial directions introduce a non-Riemannian structure to the spacetime experienced by the clock. A specific version of Finsler geometry provides a new setting for a combination of quantum and gravitational effects. The Finsler structure is parameterized by entropy and purity of the state\, and uncertainty relations prevent it from being Riemannian. By unifying quantum and gravitational effects in a geometric framework\, this approach offers new avenues for advancements in our understanding of quantum reference frames and their applications in semi-classical gravity. \nThe seminar will take place online via Zoom \nMonday 27.01.25 at 14:30 CET \nZoom Login: \nhttps://uni-bremen.zoom-x.de/j/4651981280\nMeeting ID: 465 198 1280\nPW: gravi
URL:https://qvls.de/event/relativistic-implications-of-entropy-and-purity/
LOCATION:Niedersachsen
CATEGORIES:Bildung,DE
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250127T150000
DTEND;TZID=Europe/Berlin:20250127T163000
DTSTAMP:20260525T130102
CREATED:20250127T190703Z
LAST-MODIFIED:20250127T190703Z
UID:10002225-1737990000-1737995400@qvls.de
SUMMARY:Vision of Future Observatories for Gravitational-Wave Astronomy and Fundamental Physics
DESCRIPTION:Venue: AEI-Hannover\, R103 and online \nZoom Meeting: https://mpi-aei.zoom-x.de/j/67027580612?pwd=E0lFzZ9R3EqG0j7oGzMRTDbn4h1O3R.1 \nMeeting ID: 670 2758 0612\nPasscode: 170810 \nAbstract\nCoherent light enables length measurements of exquisite sensitivity that lie at the core of fascinating scientific discoveries\, technological advances and engineering applications\, as well as observations in fundamental physics\, astrophysics\, geodesy\, and measurement science in general. \nNovel technologies and measurement principles find application in areas that are paradigm-changing; not only in fundamental science\, but that directly impact the global economic and political stage. Detections from ground-based gravitational-wave observatories\, like Advanced LIGO and VIRGO together with measurements of their electromagnetic counterparts\, have opened a new window to observe the universe’s gravitational spectrum and have reshaped astronomy and astrophysics through Gravitational Wave and Multi-Messenger observations. As a community\, we are now charged with the next significant leap in this area: Third Generation ground-based Gravitational-Wave Observatories. Here\, I will present my vision for the development of these facilities\, such as the Einstein Telescope and Cosmic Explorer. Furthermore\, I will comment on possibilities of gaining an advantage in fundamental physics observations with facilities and technology that are readily available today. \nAt the core of these exciting scientific endeavors lie innovative optomechanical technologies and precision laser interferometers that make this all possible. In my presentation\, I will also discuss the research work conducted in my research group at the University of Arizona on the advances and implementation of novel optomechanical technologies in areas of precision measurements\, inertial sensing\, and scientific space missions such as LISA\, future GRACE-like missions. \nBrief Bio\nDr. Guzman is an experimental physicist specializing in space optical technologies\, inertial sensing\, novel optomechanical sensors and precision laser interferometry. He is a professor and holder of Jack L. Jewell endowed chair at the Wyant College of Optical Sciences in the University of Arizona. He also holds a joint courtesy appointment with the Department of Physics. He is the principal investigator of the UA groups in the international LISA Mission Consortium\, and the LIGO Scientific Collaboration. He received his Bachelor’s degree in Electrical Engineering at the University of Costa Rica\, subsequently moving to Germany to obtain a Master’s degree in Engineering Physics at the University of Oldenburg in Germany\, and a Ph.D. in Physics from the Max Planck Institute for Gravitational Physics\, where his doctoral research focused on the development of optical technologies for LISA\, LISA Pathfinder and GRACE follow-on. He was awarded a NASA Postdoctoral Program (NPP) fellowship at NASA Goddard Space Flight Center and later performed as Senior Research Associate at the National Institute of Standards and Technology (NIST)\, and Research Group Leader at the German Space Agency (DLR) in collaboration with the University of Bremen.
URL:https://qvls.de/event/vision-of-future-observatories-for-gravitational-wave-astronomy-and-fundamental-physics/
LOCATION:Niedersachsen
CATEGORIES:Bildung,DE
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250130T160000
DTEND;TZID=Europe/Berlin:20250130T173000
DTSTAMP:20260525T130102
CREATED:20250127T190336Z
LAST-MODIFIED:20250127T190336Z
UID:10002224-1738252800-1738258200@qvls.de
SUMMARY:Assembling quantum matter atom by atom
DESCRIPTION:Colloquium by Assistant Professor Julian Léonard\, Atomic Institute\, TU Wien\, Austria\nLUH\, D326\, Building 1101\, Main Building\, Welfengarten 1\, 30167 Hannover \nIntroducing tools from microscopy recently brought the control of quantum gases to the single-particle level. It allowed experimenters to synthesize\, manipulate\, and probe few-body quantum states with high fidelity. I will present experimental studies of assembled quantum matter in optical lattices\, ranging from entanglement dynamics in non-equilibrium systems to topologically ordered systems. I will conclude with an overview of our ongoing research on light-mediated interactions in an optical tweezer array\, and its prospects for quantum simulation and information. \nAccess data for the transfer:\nZoom Access: https://us04web.zoom.us/j/932734874 \nThis talk is part of the „Virtual Seminar on Precision Physics and Fundamental Symmetries“ series and of the SFB DQ-mat colloquium series:\nhttps://indico.cern.ch/category/12183/
URL:https://qvls.de/event/assembling-quantum-matter-atom-by-atom/
LOCATION:Niedersachsen
CATEGORIES:Bildung,DE
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