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.
- Hayward, Sean A. (26 January 2006). "Formation and evaporation of non-singular black holes". Physical Review Letters. 96 (3). arXiv:gr-qc/0506126. doi:10.1103/PhysRevLett.96.031103.
- 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). arXiv:1412.6015. doi:10.1007/s10714-015-1882-8.
- 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.
- Contreras, E.; Bargueño, P. (20 October 2018). "Scale--dependent Hayward black hole and the generalized uncertainty principle". Modern Physics Letters A. 33 (32): 1850184. arXiv:1809.00785. doi:10.1142/S0217732318501845.
- Frolov, Valeri P. (28 November 2016). "Notes on non-singular models of black holes". Physical Review D. 94 (10). arXiv:1609.01758. doi:10.1103/PhysRevD.94.104056.