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SUMMARY:Spin-eccentricity interplay in merging binary black holes - Giulia
  Fumagalli\, Università degli Studi di Milano-Bicocca
DTSTART:20240126T130000Z
DTEND:20240126T140000Z
UID:TALK211405@talks.cam.ac.uk
CONTACT:Daniela Cors
DESCRIPTION:Orbital eccentricity and spin precession are precious observab
 les to infer the formation history of binary black holes with gravitationa
 l-wave data. We present a post-Newtonian\, multi-timescale analysis of the
  binary dynamics able to capture both precession and eccentricity over lon
 g inspirals. We show that the evolution of an eccentric binary can be redu
 ced that of effective source on quasi-circular orbits\, coupled to a post-
 Newtonian prescription for the secular evolution of the eccentricity.\nOur
  findings unveil an interplay between precession and eccentricity: the spi
 ns of eccentric binaries precess on shorter timescales and their nutation 
 amplitude is altered compared to black holes on quasi-circular orbits\, co
 nsequently affecting the so-called spin morphology. Even if binaries circu
 larize by the time they enter the sensitivity window of our detectors\, th
 eir spin orientations retain some memory of the past evolution on eccentri
 c orbits\, thus providing a new link between gravitational-wave detection 
 and astrophysical formation.  At the same time\, we point out that residua
 l eccentricity should be considered a source of systematics when reconstru
 cting the past history of black-hole binaries using the spin orientations.
  
LOCATION:Potter room/Zoom
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