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The Hayward metric is the simplest description of a black hole which is non-singular. The metric was written down by Sean Hayward as the minimal model which is regular, static, spherically symmetric and asymptotically flat. The metric is not derived from any particular alternative theory of gravity, but provides a framework to test the formation and evaporation of non-singular black holes both within general relativity and beyond. Hayward first published his metric in 2005 and numerous papers have studied it since.

References

1. Hayward, Sean A. (26 January 2006). "Formation and evaporation of non-singular black holes". Physical Review Letters. 96 (3): 031103. arXiv:gr-qc/0506126. Bibcode:2006PhRvL..96c1103H. doi:10.1103/PhysRevLett.96.031103. PMID 16486679. S2CID 15851759.
2. De Lorenzo, Tommaso; Pacilio, Costantino; Rovelli, Carlo; Speziale, Simone (1 April 2015). "On the Effective Metric of a Planck Star". General Relativity and Gravitation. 47 (4): 41. arXiv:1412.6015. Bibcode:2015GReGr..47...41D. doi:10.1007/s10714-015-1882-8. S2CID 118431674.
3. Chiba, Takeshi; Kimura, Masashi (1 April 2017). "A Note on Geodesics in Hayward Metric". Progress of Theoretical and Experimental Physics. 2017 (4). arXiv:1701.04910. doi:10.1093/ptep/ptx037.
4. Contreras, E.; Bargueño, P. (20 October 2018). "Scale--dependent Hayward black hole and the generalized uncertainty principle". Modern Physics Letters A. 33 (32): 1850184–1850228. arXiv:1809.00785. Bibcode:2018MPLA...3350184C. doi:10.1142/S0217732318501845. S2CID 59946026.
5. Frolov, Valeri P. (28 November 2016). "Notes on non-singular models of black holes". Physical Review D. 94 (10): 104056. arXiv:1609.01758. Bibcode:2016PhRvD..94j4056F. doi:10.1103/PhysRevD.94.104056. S2CID 119309868.

v t e Black holes
Outline
Types	BTZ black hole Schwarzschild Rotating Charged Virtual Kugelblitz Supermassive Primordial Direct collapse Rogue Malament–Hogarth spacetime
Size	Micro Extremal Electron Stellar Microquasar Intermediate-mass Supermassive Active galactic nucleus Quasar LQG Blazar OVV
Formation	Stellar evolution Gravitational collapse Neutron star Related links Tolman–Oppenheimer–Volkoff limit White dwarf Related links Supernova Micronova Hypernova Related links Gamma-ray burst Binary black hole Quark star Supermassive star Quasi-star Supermassive dark star X-ray binary
Properties	Astrophysical jet Gravitational singularity Ring singularity Theorems Event horizon Photon sphere Innermost stable circular orbit Ergosphere Penrose process Blandford–Znajek process Accretion disk Hawking radiation Gravitational lens Microlens Bondi accretion M–sigma relation Quasi-periodic oscillation Thermodynamics Bekenstein bound Bousso's holographic bound Immirzi parameter Schwarzschild radius Spaghettification
Issues	Black hole complementarity Information paradox Cosmic censorship ER = EPR Final parsec problem Firewall (physics) Holographic principle No-hair theorem
Metrics	Schwarzschild (Derivation) Kerr Reissner–Nordström Kerr–Newman Hayward
Alternatives	Nonsingular black hole models Black star Dark star Dark-energy star Gravastar Magnetospheric eternally collapsing object Planck star Q star Fuzzball Geon
Analogs	Optical black hole Sonic black hole
Lists	Black holes Most massive Nearest Quasars Microquasars
Related	Outline of black holes Black Hole Initiative Black hole starship Black holes in fiction Big Bang Big Bounce Compact star Exotic star Quark star Preon star Gravitational waves Gamma-ray burst progenitors Gravity well Hypercompact stellar system Membrane paradigm Naked singularity Population III star Supermassive star Quasi-star Supermassive dark star Rossi X-ray Timing Explorer Superluminal motion Timeline of black hole physics White hole Wormhole Tidal disruption event Planet Nine
Notable	Cygnus X-1 XTE J1650-500 XTE J1118+480 A0620-00 Sagittarius A* Centaurus A Phoenix Cluster PKS 1302-102 OJ 287 SDSS J0849+1114 TON 618 MS 0735.6+7421 NeVe 1 Hercules A 3C 273 Q0906+6930 Markarian 501 ULAS J1342+0928 PSO J030947.49+271757.31 AT2018hyz Swift J1644+57
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