articleClassical and Quantum GravityMay 26, 2023HYBRID OA

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

SVSunny VagnozziRRRittick RoyYTYu-Dai TsaiLVLuca VisinelliMAMisba Afrin

University of Trento · Fudan University · +11 more institutions

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Abstract

Abstract Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We consider a wide range of well-motivated deviations from classical general relativity (GR) BH solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A ∗ (Sgr A ∗ ), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of Sgr A ∗ ’s mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BHs, string-inspired space-times, violations of…

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Topics & keywords

Topics
Keywords
  • Physics
  • Event horizon
  • Horizon
  • Scale (ratio)
  • Apparent horizon
  • Sagittarius A*
  • Theoretical physics
  • Telescope
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