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X-WR-CALNAME:Centre for Mathematical Sciences
X-ORIGINAL-URL:https://math-sciences.org
X-WR-CALDESC:Events for Centre for Mathematical Sciences
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TZID:UTC
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TZOFFSETFROM:+0000
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DTSTART:20210101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20210915T160000
DTEND;TZID=UTC:20210915T170000
DTSTAMP:20210929T013930
CREATED:20210728T200829Z
LAST-MODIFIED:20210728T201042Z
UID:4067-1631721600-1631725200@math-sciences.org
SUMMARY:Mikhail Shifman (Minnesota)
DESCRIPTION:
URL:https://math-sciences.org/event/mikhail-shifman-minnesota/
LOCATION:Zoom
CATEGORIES:Seminars,Theoretical Physics
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BEGIN:VEVENT
DTSTART;TZID=UTC:20210929T160000
DTEND;TZID=UTC:20210929T170000
DTSTAMP:20210929T013930
CREATED:20210809T125452Z
LAST-MODIFIED:20210924T100147Z
UID:4080-1632931200-1632934800@math-sciences.org
SUMMARY:Rafael Aoude (UC Louvain)
DESCRIPTION:Coherent-spin amplitudes and Classical Observables\n\n\nThe quantum field-theoretic approach to classical observables due to Kosower\, Maybee and Oâ€™Connell provides a rigorous pathway from on-shell scattering amplitudes to classical perturbation theory. In this talk\, I will describe how we promote this formalism to general classical spinning objects by using coherent spin states. Our approach is fully covariant with respect to the massive little group SU(2) and is therefore completely synergistic with the massive spinor-helicity formalism. We apply this approach to classical two-body scattering due gravitational interaction. Starting from the coherent-spin elastic-scattering amplitude\, we derive the classical impulse and spin kick observables to first post-Minkowskian order but to all orders in the angular momenta of the massive spinning objects. If time allows\, I will describe how we also extract an effective two-body Hamiltonian\, which can be used beyond the scattering setting.
URL:https://math-sciences.org/event/rafael-audoe-uc-louvain/
LOCATION:Zoom
CATEGORIES:Seminars,Theoretical Physics
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