Diagnostic of f (R) under the Om(z) function

作者：Jaime Luisa G^*

来源：PHYSICAL REVIEW D, 2015, 91(12): 124070.

DOI：10.1103/PhysRevD.91.124070

We perform the two-point diagnostic for the Om(z) function proposed by Sahni et al. in 2014 for the Starobinsky and the Hu and Sawicki models in f(R) gravity. We show that the observed values of the Omh(2) function can be explained in f(R) models, while Lambda CDM the Omh(2) function is expected to be a redshift independent number. We perform the analysis for some particular values of Omega(0)(m), finding a cumulative probability (P(chi(2) <= chi(2)(model))) P similar to 0.16 or similar to 0.09 for the better cases versus a cumulative probability of P similar to 0.98 in Lambda CDM scenario. We also show that these models present a characteristic signature around the interval between z similar to 2 and z similar to 4 that could be confronted with future observations using the same test.

• 出版日期2015-6-29