§Covariant
energy conservation:
§
§
§Note:
phantom if r+P(r)<0
§Remarks:
1.If for a given EoS function P=P(r) there exists a rL such that
P(rL) = - rL, then rL has the dynamical
role of an effective cosmological constant.
2.A given non-linear EoS P(r) may admit more than one point rL. If these
points exist, they are fixed
points of the energy conservation equation.