Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 18, Issue 24, Pages 5583-5590Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/18/24/317
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We show the existence of spatially homogeneous but anisotropic cosmological models whose cosmic microwave background temperature is exactly isotropic at one instant of time but whose rate of expansion is highly anisotropic. Although these models require fine-tuning, they nevertheless show that the observation of a highly isotropic cosmic microwave background temperature cannot alone be used to infer that the universe is close to a Friedmann-Lemaitre model since the time of last-scattering.
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