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UID:2530@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20260511T133000
DTEND;TZID=Europe/Berlin:20260511T143000
DTSTAMP:20260422T130927Z
URL:https://qft.physik.hu-berlin.de/next-seminars/kathrin-stoldt-2/
SUMMARY:Kathrin Stoldt - 
DESCRIPTION:Title:\n"The strawberry grows underneath the nettle": Computing
  radiated angular momentum at (3PM) and (e^6) from the impact parameter.\n
 \nAbstract:Analytic results for radiative fluxes are of interest for gravi
 tational-wave modelling\, as they can be used to inform the Effective-One-
 Body (EOB) formalism. While radiated energy has been computed to (5PM 1SF)
 \, results for radiated angular momentum are lagging behind: It is not kno
 wn beyond (3PM). To pave the way for radiated angular momentum (ΔL) at (4
 PM)\, we propose a novel method to calculate this observable within the WQ
 FT framework. The central quantity is the change in the impact parameter. 
 While its conservative part is badly behaved and both UV and IR divergent\
 , its dissipative part is finite and contains the information needed to de
 rive ΔL. We may split all contributions into two categories\, depending o
 n the scaling of the loop momenta with the energy of the outgoing worldlin
 e. Its ``dynamical" part can be computed in analogy to the impulse. The ``
 static" contributions\, related to the wave memory\, are accessible throug
 h certain n-point functions\, which we named ``static correlators". This m
 ethod is designed to be applicable at general PM orders. We have demonstra
 ted its functionality by reproducing from it the known result of the 3PM r
 adiated angular momentum\, as well as deriving the equivalent result in el
 ectrodynamics\, which was not covered in the literature so far.
CATEGORIES:ERC Group Seminar
LOCATION:Room 1.221\, IRIS building\, Zum großen Windkanal 6\, Berlin\, 12
 489\, Germany
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Zum großen Windkanal 6\, B
 erlin\, 12489\, Germany;X-APPLE-RADIUS=100;X-TITLE=Room 1.221\, IRIS build
 ing:geo:0,0
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DTSTART:20260329T030000
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