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SUMMARY:Stellar-mass binary black holes in circumbinary disks: smoking-gun
  signatures in LISA - Isobel Romero-Shaw (DAMTP)
DTSTART:20241028T140000Z
DTEND:20241028T150000Z
UID:TALK222916@talks.cam.ac.uk
CONTACT:Loren E. Held
DESCRIPTION:The LIGO-Virgo-KAGRA Collaboration has so far announced the gr
 avitational-wave detections of about 80 binary black hole mergers.\nEach c
 ontains black holes with masses between 5 and 100 solar masses\, putting t
 hem in the stellar-mass black hole range.\nDespite the wealth of detection
 s\, the formation channels of these binaries remain a mystery: \nare the c
 omponents born together as a stellar binary in isolation\, evolving slowly
  over millennia via mass transfer and/or a common envelope phase before me
 rging as compact objects? \nOr do they become bound due to dynamical inter
 actions in densely populated environments\, like star clusters and AGN dis
 ks?\nWith only the final few moments before the merger visible to us with 
 the current generation of ground-based gravitational wave detectors\, thes
 e questions are hard to answer.\nHowever\, future-space-based detectors li
 ke LISA\, operating at orders-of-magnitude lower frequencies\, will reveal
  much earlier stages in the lives of these binaries.\nWith LISA due to lau
 nch in 2035 - several years before the likely start date of next-generatio
 n ground-based detectors - this instrument is poised to shed unique light 
 on the longstanding question of stellar-mass binary black hole merger form
 ation.\nIn this talk\, I review the current status of gravitational-wave d
 etections and suggest constraints on their origins from current detectors.
 \nI then focus on binary black holes with circumbinary disks\, and the cha
 racteristic marks these disks could leave on the eccentricities of stellar
 -mass binary black holes sweeping through the LISA band.\nI show that thes
 e eccentric signatures are detectable in LISA\, and may have a smoking-gun
  relationship with mass ratio.\nHowever\, these eccentricities may lead di
 sk-driven binaries to be mistaken for those that are dynamically assembled
 \, risking mistaken inference of formation channels and rates if the effec
 ts of circumbinary disks are not considered.
LOCATION:MR14 DAMTP and online
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