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gravity

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Théorie de gravité

Contexte expérimental

Other than Ondes Gravitationnelles, many experiments will probe gravity with exquisite precision in the next 10 years. These include (voir cosmologie) [à completer]

  • Event Horizon Telescope;
  • GRAVITY;
  • Euclid;
  • SKA;
  • CMB S-4, Simons Observatory
  • Neutron Star Interior Composition Explorer (NICER) (check if anything new expected?).
  • atom interferometry : tests of GR with atom interformetry
  • ELT
  • Microscope (new results expected?);

Theory

  • Further development of modified gravity theories, beyond the linear level, screening mechanisms, etc.
  • Structure formation, EFT approach, N-body simulations, constraints on gravity.
  • Multiple different possible tests of modified gravity with GWs. Requires accurate waveforms from inspiral and ringdown phases
  • BHs and other compact objects in modified gravity and their properties
    • e.g. For BH, existence or not of a horizon, fuzzballs, no-hair theorems (requires finding stationary metrics solutions of a given modified gravity theory and comparing their characteristics to Kerr),….
    • For stars, for e.g. further work on the influence of modified gravity on the mass gap between neutron stars and BH. Properties of neutron stars
  • quasi normal modes in modified gravity theories; ring-down spectrum of these perturbed black holes
  • Other compact objects considered exotic in general relativity (ie demanding exotic presence of matter), e.g. wormholes. Do such objects exist in vacuum of modified gravity theories? How do they differ from black holes? wormhole throat versus horizon, null geodesics and light rings etc.
  • EHT: properties of the light-ring and tests of GR. VLT.
  • Impact on astrophysics: EHT+GWs could confirm existence of super-massive BHs, and their abundance and mass distribution. How are they formed? Idem for stellar and intermediate mass black holes.
gravity.1675800885.txt.gz · Last modified: 2023/02/07 21:14 by daniele.steer

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