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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Prof Steven Balbus FRS, FInstP

Emeritus Savilian Professor

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Pulsars, transients and relativistic astrophysics
steven.balbus@physics.ox.ac.uk
  • About
  • Publications

Determining the difference between local acceleration and local gravity: applications of the equivalence principle to relativistic trajectories

American Journal of Physics American Association of Physics Teachers 92:6 (2024) 444-449

Abstract:

We show by direct calculation that the common equivalence principle explanation for why gravity must deflect light is quantitatively incorrect by a factor of three in Schwarzschild geometry. It is, therefore, possible, at least as a matter of principle, to tell the difference between local acceleration and a true gravitational field by measuring the local deflection of light. We calculate as well the deflection of test particles of arbitrary energy and construct a leading-order coordinate transformation from Schwarzschild to local inertial coordinates, which shows explicitly how the effects of spatial curvature manifest locally for relativistic trajectories of both finite and vanishing rest mass particles.
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The dynamics of accretion flows near to the innermost stable circular orbit

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:2 (2024) 1900-1916

Authors:

Andrew Mummery, Francesco Mori, Steven Balbus
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Testing theories of accretion and gravity with super-extremal Kerr discs

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:3 (2023) 5956-5973

Authors:

Andrew Mummery, Steven Balbus, Adam Ingram
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Fundamental scaling relationships revealed in the optical light curves of tidal disruption events

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:2 (2023) 2452-2489

Authors:

Andrew Mummery, Sjoert van Velzen, Edward Nathan, Adam Ingram, Erica Hammerstein, Ludovic Fraser-Taliente, Steven Balbus
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Complete characterization of the orbital shapes of the noncircular Kerr geodesic solutions with circular orbit constants of motion

Physical Review D American Physical Society (APS) 107:12 (2023) 124058

Authors:

Andrew Mummery, Steven Balbus
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