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SUMMARY:Alexandre Le Tiec (Observatoire de Paris)
DTSTART:20200925T170000Z
DTEND:20200925T180000Z
DTSTAMP:20260423T022812Z
UID:CMU-TP/14
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/14/">
 Tidal Love numbers of Kerr black holes</a>\nby Alexandre Le Tiec (Observat
 oire de Paris) as part of Carnegie Mellon theoretical physics\n\n\nAbstrac
 t\nThe open question of whether a black hole can become tidally deformed b
 y an external gravitational field has profound implications for fundamenta
 l physics\, astrophysics and gravitational-wave astronomy. Love numbers ch
 aracterize the tidal deformability of compact objects such as astrophysica
 l (Kerr) black holes. We prove that all Love numbers vanish identically fo
 r a Kerr black hole in the nonspinning limit or for an axisymmetric tidal 
 perturbation. In contrast to this result\, we show that Love numbers are g
 enerically nonzero for a spinning black hole. Specifically\, to linear ord
 er in the black hole spin and the weak perturbing tidal field\, we compute
  in closed form the Love numbers that couple the mass-type and current-typ
 e quadrupole moments to the electric-type and magnetic-type quadrupolar ti
 dal fields. This tidal deformability is potentially observationally import
 ant through its contribution to the accumulated gravitational-wave phase o
 f an inspiralling stellar-mass compact object into a massive black hole. W
 e show that for a dimensionless black hole spin ~ 0.1\, the nonvanishing q
 uadrupolar Love numbers are ~ 0.002. This indicates that\, despite black h
 oles being particularly "rigid" compact objects\, their nonvanishing tidal
  deformability could be detected by the future gravitational-wave interfer
 ometer LISA.\n
LOCATION:https://researchseminars.org/talk/CMU-TP/14/
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