We present a new model universe based on the junction of FRW to flat
Lemaitre-Tolman-Bondi (LTB) solutions of Einstein equations along our past
light cone, bringing structures within the FRW models. The model is assumed
globally to be homogeneous, i.e. the cosmological principle is valid. Local
inhomogeneities within the past light cone are modeled as a flat LTB, whereas
those outside the light cone are assumed to be smoothed out and represented by
a FRW model. The model is singularity free, always FRW far from the observer
along the past light cone, gives way to a different luminosity distance
relation as for the CDM/FRW models, a negative deceleration parameter near the
observer, and correct linear and non-linear density contrast. As a whole, the
model behaves like a FRW model on the past light cone with a special behavior
of the scale factor, Hubble and deceleration parameter, mimicking dark energy.Comment: 23 pages, 19 figures, published version in GR