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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration finite foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf sheaves simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeJan 9th 2019
   • (edited Jan 9th 2019)
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to the first known examples: * [[Daniele Amati]], [[Ctirad Klimčík]], _Nonperturbative computation of the Weyl anomaly for a class of nontrivial backgrounds_, Phys. Lett. B, 219:443–447, 1989 ([spire:269390](https://inspirehep.net/record/269390), <a href="https://doi.org/10.1016/0370-2693(89)91092-7">10.1016/0370-2693(89)91092-7</a>) * [[Gary Horowitz]], Alan R. Steif, _Spacetime singularities in string theory_, Phys. Rev. Lett. 64, 260 1990 ([doi:10.1103/PhysRevLett.64.260](https://doi.org/10.1103/PhysRevLett.64.260)) <a href="https://ncatlab.org/nlab/revision/diff/universal+spacetime/4">diff</a>, <a href="https://ncatlab.org/nlab/revision/universal+spacetime/4">v4</a>, <a href="https://ncatlab.org/nlab/show/universal+spacetime">current</a>

   added pointer to the first known examples:

   • Daniele Amati, Ctirad Klimčík, Nonperturbative computation of the Weyl anomaly for a class of nontrivial backgrounds, Phys. Lett. B, 219:443–447, 1989 (spire:269390, 10.1016/0370-2693(89)91092-7)

   • Gary Horowitz, Alan R. Steif, Spacetime singularities in string theory, Phys. Rev. Lett. 64, 260 1990 (doi:10.1103/PhysRevLett.64.260)

   diff, v4, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeJan 14th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's * Martin Kuchynka, _Einstein-Yang-Mills fields immune to quantum corrections_ ([arXiv:2001.03768](https://arxiv.org/abs/2001.03768)) <a href="https://ncatlab.org/nlab/revision/diff/universal+spacetime/5">diff</a>, <a href="https://ncatlab.org/nlab/revision/universal+spacetime/5">v5</a>, <a href="https://ncatlab.org/nlab/show/universal+spacetime">current</a>

   added pointer to today’s

   • Martin Kuchynka, Einstein-Yang-Mills fields immune to quantum corrections (arXiv:2001.03768)

   diff, v5, current

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeFeb 19th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's replacement * Sigbjørn Hervik, Marcello Ortaggio, _Universal Black Holes_, J. High Energ. Phys. 2020, 47 (2020) ([arXiv:1907.08788](https://arxiv.org/abs/1907.08788)) <a href="https://ncatlab.org/nlab/revision/diff/universal+spacetime/6">diff</a>, <a href="https://ncatlab.org/nlab/revision/universal+spacetime/6">v6</a>, <a href="https://ncatlab.org/nlab/show/universal+spacetime">current</a>

   added pointer to today’s replacement

   • Sigbjørn Hervik, Marcello Ortaggio, Universal Black Holes, J. High Energ. Phys. 2020, 47 (2020) (arXiv:1907.08788)

   diff, v6, current

4. • CommentRowNumber4.
   • CommentAuthorUrs
   • CommentTimeSep 6th 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's * Metin Gurses, Yaghoub Heydarzade, Cetin Senturk, *Kerr-Schild-Kundt Metrics in Generic Gravity Theories with Modified Horndeski Couplings* ([arXiv:2109.01244](https://arxiv.org/abs/2109.01244)) <a href="https://ncatlab.org/nlab/revision/diff/universal+spacetime/7">diff</a>, <a href="https://ncatlab.org/nlab/revision/universal+spacetime/7">v7</a>, <a href="https://ncatlab.org/nlab/show/universal+spacetime">current</a>

   added pointer to today’s

   • Metin Gurses, Yaghoub Heydarzade, Cetin Senturk, Kerr-Schild-Kundt Metrics in Generic Gravity Theories with Modified Horndeski Couplings (arXiv:2109.01244)

   diff, v7, current