[W65] Diego Rubiera-Garcia: Surviving from a Journey into a Black Hole

 

Wednesday 20 June 2018, 15.00 GMT

Questions via youtube chat

Surviving from a journey into a black hole

Speaker
Diego Rubiera-Garcia
Research Fellow, FCT, Institute of Astrophysics and Space Sciences (IA), Lisbon University, Portugal

Host
Alejandro Cárdenas-Avendaño

Abstract
Black holes are believed to be the end-state of gravitationally collapsed stars of enough mass, whose existence is predicted by General Relativity. According to this same theory, a hypothetical spacecraft journeying towards the innermost region of a black hole would end its existence once the central singularity is reached in finite affine time. In this talk I will present an extension of General Relativity which includes further contributions of scalars built out of the Ricci tensor and formulated in metric-affine spaces, where metric and affine connection are independent entities. In this formalism, the corresponding theories are compatible with solar system experiments and with gravitational wave observations out of BH-BH and NS-NS mergers. Using some of these theories, I will discuss the fate of light rays and extended observers as they get close to the central singularity, using geodesic completeness, tidal forces, scattering of waves, and accelerated motion, finding that they can go through the black hole. These results allow one to rethink some of the assumptions usually made about these classically problematic regions.

Slides

References

  • P. Abbott et al., “GW170814: A three-detector observation of gravitational waves from a binary black hole coalescence”, Phys. Rev. Lett. 119, 141101 (2017).
  • M. Ezquiaga and M. Zumalacárregui, “Dark energy after GW170817: Dead ends and the road ahead”, Phys. Rev. Lett. 119, 251304 (2017).
  • Beltrán Jiménez, L. Heisenberg, G. J. Olmo and DRG; “Born-Infeld inspired modifications of gravity”; Phys. Rept. 727, 1 (2018)
  • G. J. Olmo, DRG, and H. Sanchis-Alepuz; “Geonic black holes and remnants in Eddington-inspired Born-Infeld gravity”; Eur. Phys. J. C 74, 2804 (2014).
  • G. J. Olmo, DRG, and A. Sanchez-Puente; “Geodesic completeness in a wormhole spacetime with horizons”; Phys. Rev. D 92, 044047 (2015).
  • G. J. Olmo, DRG, and A. Sanchez-Puente; “Impact of curvature divergences on physical observers in a wormhole space-time with horizons”; Class. Quant. Grav. 33, 115007 (2016).

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