{
  "id": "1110.1998",
  "version": "v2",
  "published": "2011-10-10T10:50:31.000Z",
  "updated": "2016-11-07T19:14:23.000Z",
  "title": "How to find the holonomy algebra of a Lorentzian manifold",
  "authors": [
    "Anton S. Galaev"
  ],
  "comment": "15 pages; the final version",
  "journal": "Lett. Math. Phys. 105 (2015), no. 2, 199--219",
  "doi": "10.1007/s11005-014-0741-y",
  "categories": [
    "math.DG",
    "gr-qc",
    "hep-th"
  ],
  "abstract": "Manifolds with exceptional holonomy play an important role in string theory, supergravity and M-theory. It is explained how one can find the holonomy algebra of an arbitrary Riemannian or Lorentzian manifold. Using the de~Rham and Wu decompositions, this problem is reduced to the case of locally indecomposable manifolds. In the case of locally indecomposable Riemannian manifolds, it is known that the holonomy algebra can be found from the analysis of special geometric structures on the manifold. If the holonomy algebra $\\mathfrak{g}\\subset\\mathfrak{so}(1,n-1)$ of a locally indecomposable Lorentzian manifold $(M,g)$ of dimension $n$ is different from $\\mathfrak{so}(1,n-1)$, then it is contained in the similitude algebra $\\mathfrak{sim}(n-2)$. There are 4 types of such holonomy algebras. Criterion how to find the type of $\\mathfrak{g}$ are given, and special geometric structures corresponding to each type are described. To each $\\mathfrak{g}$ there is a canonically associated subalgebra $\\mathfrak{h}\\subset\\mathfrak{so}(n-2)$. An algorithm how to find $\\mathfrak{h}$ is provided.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-10-10T10:50:31.000Z",
      "abstract": "If the holonomy algebra $\\mathfrak{g}\\subset\\mathfrak{so}(1,n-1)$ of a locally indecomposable Lorentzian manifold $(M,g)$ of dimension $n$ is different from $\\mathfrak{so}(1,n-1)$, then it is contained in the similitude algebra $\\mathfrak{sim}(n-2)$. There are 4 types of such holonomy algebras. We give criterion how to find the type of $\\mathfrak{g}$. To each $\\mathfrak{g}$ there is a canonically associated subalgebra $\\mathfrak{h}\\subset\\mathfrak{so}(n-2)$. We provide an algorithm how to find $\\mathfrak{h}$. We also give algorithms for obtaining the de Rham-Wu decomposition for Riemannian and Lorentzian manifolds. These results show how one can find the holonomy algebra of an arbitrary Lorentzian manifold.",
      "comment": "18 pages",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2016-11-07T19:14:23.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "53C29",
      "53B30",
      "53C50"
    ],
    "keywords": [
      "holonomy algebra",
      "arbitrary lorentzian manifold",
      "locally indecomposable lorentzian manifold",
      "similitude algebra",
      "rham-wu decomposition"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1007/s11005-014-0741-y",
      "publisher": "Springer"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 931175,
      "adsabs": "2011arXiv1110.1998G"
    }
  }
}