Accretion of matter and spectra of binary X-ray sources in massive gravity

Grigoris Panotopoulos, Ángel Rincón, Ilídio Lopes

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We study low-mass binary X-ray sources involving stellar mass black holes within massive gravity. Regarding the accretion disk, we adopt the standard model for an optically thick, cool, and geometrically thin disk by Shakura–Sunyaev. For the gravitational field generated by the black hole, we consider the analogue of the Schwarzschild–de Sitter space–time of Einstein's theory in massive gravity, for which we found an additional term linear in the radial coordinate. Then, we compute the radial velocity, the energy density and the pressure as a function of the radial coordinate, and the X-ray emission's soft spectral component expected from the disk. We also investigated in detail the impact of this new geometry. Our result indicates that by using observed spectra from confirmed X-ray binaries involving astrophysical black holes, we can put strong constraints on alternative theories of gravity.

Original languageEnglish
Article number168596
JournalAnnals of Physics
StatePublished - Oct 2021
Externally publishedYes


  • Accretion disk model
  • Alternative theory of gravity
  • Black hole
  • General relativity
  • Low mass binary
  • Massive gravity


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