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SUMMARY:Dynamical Tidal Response of Neutron Stars  from Scattering Amplitu
 des
DTSTART:20260930T124500Z
DTEND:20260930T140000Z
DTSTAMP:20260930T021500Z
UID:indico-event-17400@indico.math.cnrs.fr
CONTACT:cecile@ihes.fr
DESCRIPTION:Speakers: Muddu Venkata Sai Saketh (International Centre for T
 heoretical Sciences (ICTS-TIFR)\, Bengaluru\, India)\n\nSéminaire Amplitu
 des et Gravitation sur l'Yvette (IHES/IPhT)\nIn this talk I will describe 
 an amplitude-based framework for extracting the frequency-dependent tidal 
 response of neutron stars while preserving the tidal resonances associated
  with their normal modes. The response is obtained by matching the amplitu
 de for gravitational-wave scattering off a neutron star\, equivalently gra
 vitational Compton scattering\, computed using relativistic stellar pertur
 bation theory\, to the corresponding amplitude in worldline effective fiel
 d theory. The tidal contribution is isolated through the difference betwee
 n the neutron-star and black-hole scattering phases. Unlike conventional t
 reatments\, the construction allows for a post-Newtonian expansion without
  Taylor expanding the response in frequency or assuming a harmonic-oscilla
 tor model for the internal dynamics.\nI will present the tidal response th
 rough relative third post-Newtonian (3PN) order and use currently availabl
 e numerical results to illustrate its frequency dependence. The results re
 produce the known static Love numbers in the low-frequency limit\, exhibit
  resonances at the expected stellar mode frequencies\, and capture their d
 amping through gravitational-wave emission. I will also discuss the renorm
 alisation of the tidal response required through 3PN order. Time permittin
 g\, I will outline how the resulting response can be incorporated into bin
 ary dynamics and ultimately into gravitational waveforms. \n \nPour êtr
 e informé des prochains séminaires vous pouvez vous abonner à la liste 
 de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme 
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 nom et nom) et laissez le corps du message vide.\n\nhttps://indico.math.cn
 rs.fr/event/17400/
LOCATION:Amphithéâtre Léon Motchane (IHES)
URL:https://indico.math.cnrs.fr/event/17400/
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