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Published July 22, 1996 | Published
Journal Article Open

A Low-Density Closed Universe


Matter with an equation of state p = -ρ/3 may arise in certain scalar field theories, and the energy density of this matter decreases as a-2 with the scale factor a of the Universe. In this case, the Universe could be closed but still have a nonrelativistic-matter density Ω0<1. Furthermore, the cosmic microwave background could come from a causally connected region at the other side of the Universe. This model is currently viable and might be tested by a host of forthcoming observations.

Additional Information

© 1996 The American Physical Society Received 25 January 1996 We thank D. Helfand and D. Spergel for useful comments. This work was supported in part by the DOE under Contract No. DEFG02-92-ER 40699 and by NASA under Contract No. NAG5-3091.

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