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The Klein-Gordon equations were recently solved in general relativity for thecase of a plane-symmetric static massless scalar field with cosmologicalconstant. By analytic continuation, time-dependent solutions can be obtainedthat correspond to cosmologies. These spacetimes are studied here, and includeamong them a solution exhibiting both early inflation and later continued rapidexpansion that matches well with the Concordance Model.

Exact plane symmetric cosmological solutions for a massless scalar field and cosmological constant