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DTSTART;TZID=Europe/Berlin:20250123T100000
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DTSTAMP:20260429T015238
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/
CATEGORIES:Bildung,DE
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DTSTART;TZID=Europe/Berlin:20250123T163000
DTEND;TZID=Europe/Berlin:20250123T173000
DTSTAMP:20260429T015238
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/
CATEGORIES:Bildung,DE
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