Beyond the Friedmann-Lemaitre-Robertson-Walker Big Bang singularity
  Einstein's equation, in its standard form, breaks down at the Big Bang
singularity. A new version, equivalent to Einstein's whenever the latter is
defined, but applicable in wider situations, is proposed. The new equation
remains smooth at the Big Bang singularity of the
Friedmann-Lemaitre-Robertson-Walker model. It is a tensor equation defined in
terms of the Ricci part of the Riemann curvature. It is obtained by taking the
Kulkarni-Nomizu product between Einstein's equation and the metric tensor.
