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SUMMARY:Precision Gravity: Gravitational Waves using Feynman Diagrams
DTSTART:20251119T134500Z
DTEND:20251119T150000Z
DTSTAMP:20260427T050000Z
UID:indico-event-15418@indico.math.cnrs.fr
CONTACT:cecile@ihes.fr
DESCRIPTION:Speakers: Raj Patil (MPI Potsdam & Humboldt Universität Berli
 n)\n\nSéminaire Amplitudes et Gravitation sur l'Yvette (IHES/IPhT)\nObser
 vations of gravitational waves (GW) have the potential to unravel the myst
 eries of cosmic origins\, constrain the equations of state of compact obje
 cts\, and serve as a test of general relativity. To achieve these scientif
 ic goals\, it is crucial to develop highly precise and accurate waveform t
 emplates to minimize systematic errors. My talk will focus on computing st
 ate-of-the-art effective two-body Hamiltonians and fluxes using techniques
  from quantum field theory and scattering amplitudes. These Hamiltonians a
 nd fluxes serve as fundamental building blocks for waveform templates\, an
 d dictate the accuracy of the waveform model. In particular\, I will descr
 ibe the effects of spinning and tidally deformed compact objects on evolut
 ion of the binary system. I will present computations of the linear-in-spi
 n Hamiltonian at 4.5 post-Newtonian (PN) order\, as well as the quadratic-
 in-spin Hamiltonian at 5PN order. Furthermore\, I will describe oscillatio
 n modes of neutron stars (NS) induced by tidal interactions\, particularly
  the fundamental-mode dynamical tides\, which are expected to play a cruci
 al role in constraining the NS equation of state in upcoming GW observing 
 runs. I will discuss the computation of fluxes up to 2PN for adiabatic tid
 al interactions and effective Hamiltonians up to 3PN for both dynamic and 
 adiabatic tidal interactions. The latter is particularly interesting as it
  requires introducing counterterms to remove divergences\, leading to a re
 normalization group flow of the post-adiabatic Love number.\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 
 sujet: "subscribe seminaire_physique PRENOM NOM"(indiquez vos propres pré
 nom et nom) et laissez le corps du message vide.\n\nhttps://indico.math.cn
 rs.fr/event/15418/
LOCATION:Amphithéâtre Léon Motchane (IHES)
URL:https://indico.math.cnrs.fr/event/15418/
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