### Impacto

Amores Lázaro, Ángel Miguel and Gutiérrez, M.
(1988)
*On the b-completion of certain quotient-spaces.*
Letters in Mathematical Physics, 15
(4).
pp. 341-343.
ISSN 0377-9017

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Official URL: http://www.sciencedirect.com/science/article/pii/S0393044098000382

## Abstract

We study the b-completion of the three Friedmann models of the Universe, having as models

for 3-space the sphere, the Euclidean space or the hyperbolic space. We show that in the first case

there is just one singularity, having the full completion as only neighborhood. In the other two cases

there is one essential singularity, which is the limit of all past causal geodesics; again, it has a single

neighborhood. This extends results by Bosshard [On the b-boundary of the closed Friendmann

Model, Commun. Math. Phys. 46 (1976) 263-2681 and Johnson [The bundle boundary in some

special cases, J. Math. Phys. 18 (5) (1977) 898-9021 on the closed Friedmann model.

Item Type: | Article |
---|---|

Uncontrolled Keywords: | Physics, Mathematical |

Subjects: | Sciences > Mathematics > Differential geometry |

ID Code: | 14745 |

References: | [l] B. Bosshard, On the b-boundary of the closed Friedmann model, Commun. Math. Phys. 46 (1976) 263-268. [2] D. Canarutto, An introduction to the geometry of singularities in general relatively, Riv. Nuovo Cimento 11 (3) (1988) l-60. [3] C.T.J. Dodson, Spacetime edge geometry, Int. J. Theoret. Phys. 17 (6) (1978) 389-504. [4] SW. Hawking, G.F.R. Ellis, The Large-Scale Structure of Spacetime, University Press, Cambridge, 1973. [5] R.A. Johnson, The bundle boundary in some special cases, .I. Math. Phys. 18 (5) (1977) 898-902. [6] M.A. Naimark, Les representations lineaires du groupe de Lorentz, Dunod, Paris, 1962. [7] B. O’Neill, Semi-Riemannian Geometry with Applications to Relativity, Academic Press, New York, 1982. [S] B.G. Schmidt, A new definition of singular points in general relativity, Gen. Rel. Grav. 1 (3) (1971) 269-280. |

Deposited On: | 17 Apr 2012 11:05 |

Last Modified: | 06 Feb 2014 10:08 |

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