EinsteinCC

EinsteinCC
is a reserved word in xTras. It is used to generate the name of the cosmological Einstein curvature tensor associated to a connection acting on a tangent bundle.
  • The cosmological Einstein tensor is the equation of motion derived from the Einstein-Hilbert action plus a cosmological constant.
  • The name of the cosmological Einstein tensor is "EinsteinCC + name of covariant derivative".
  • The cosmological Einstein tensor has three indices; the first is a label index for the value of the cosmological constant, the last two are the usual tangent bundle indices.