Avoidance of singularities in asymptotically safe Quantum Einstein Gravity

Georgios Kofinas, Vasilios Zarikas

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


New general spherically symmetric solutions have been derived with a cosmological "constant" Λ as a source. This Λ term is not constant but it satisfies the properties of the asymptotically safe gravity at the ultraviolet fixed point. The importance of these solutions comes from the fact that they may describe the near to the centre region of black hole spacetimes as this is modified by the Renormalization Group scaling behaviour of the fields. The consistent set of field equations which respect the Bianchi identities is derived and solved. One of the solutions (with conventional sign of temporal-radial metric components) is timelike geodesically complete, and although there is still a curvature divergent origin, this is never approachable by an infalling massive particle which is reflected at a finite distance due to the repulsive origin. Another family of solutions (of both signatures) range from a finite radius outwards, they cannot be extended to the centre of spherical symmetry, and the curvature invariants are finite at the minimum radius.

Original languageEnglish
Article number069
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
Publication statusPublished - Oct 30 2015


  • GR black holes
  • modified gravity
  • quantum black holes

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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