In quadratic gravity, requiring a finite action for allowed universes rules out anisotropic and clumpy big-bang beginnings and forces accelerated expansion near zero volume.
Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking,
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A Safe Beginning for the Universe?
In quadratic gravity, requiring a finite action for allowed universes rules out anisotropic and clumpy big-bang beginnings and forces accelerated expansion near zero volume.