Boudewijn F Roukema 2000 Class. Quantum Grav. 17 3951 doi:10.1088/0264-9381/17/19/301
Boudewijn F Roukema
Show affiliationsIt has been suggested that if the Universe satisfies a flat, multiply connected, perturbed Friedmann-Lemaître model, then cosmic microwave background data from the COBE satellite implies that the minimum size of the injectivity diameter (shortest closed spatial geodesic) must be larger than about (2/5) of the horizon diameter. To show that this claim is misleading, a simple T2×R universe model of injectivity diameter a quarter of this size, i.e. a tenth of the horizon diameter, is shown to be consistent with COBE four-year observational maps of the cosmic microwave background. This is done using the identified circles principle.
Issue 19 (7 October 2000)
Received 20 September 1999, in final form 5 January 2000
Boudewijn F Roukema 2000 Class. Quantum Grav. 17 3951
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