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We present a translation and analysis of a cosmic model published by Einsteinin 1931. The paper, which is not widely known, features a model of a universethat undergoes an expansion followed by a contraction, quite different to hisstatic model of 1917 or the monotonic Einstein-de Sitter model of 1932. Thepaper offers many insights into the cosmology of Albert Einstein in the lightof the first evidence for an expanding universe, and we discuss his views ofissues such as the curvature of space, the cosmological constant, thesingularity and the timespan of the expansion. We argue that retrospectivedescriptions of this model as cyclic or periodic are not historically ormathematically accurate. We find that calculations in the paper of the matterdensity and radius of the universe contain a numerical error, a finding that issupported by writing on a blackboard used by Einstein during a lecture atOxford University in May 1931. Our article concludes with a general discussionof his philosophy of cosmology.

Einstein's cosmic model of 1931 revisited: an analysis and translation of a forgotten model of the universe