Description
We use the Om statistic and the Genetic Algorithms (GA) in order to derive a null test on the spatially flat cosmological constant model ?CDM. This is done in two steps: first, we apply the GA to the Constitution SNIa data in order to acquire a model independent reconstruction of the expansion history of the Universe H(z) and second, we use the reconstructed H(z) in conjunction with the Om statistic, which is constant only for the ?CDM model, to derive our constraints. We find that while ?CDM is consistent with the data at the 2? level, some deviations from ?CDM model at low redshifts seems to be mildly preferred.
| ArXiv number (if any) | 1004.0960 |
|---|
