Abstract

We analyze H(z) parameter data with some conditions by using Lagrange mean value theorem in Calculus. We find that: (1) there exists decelerated phase at 1 σ confidence level in the redshift range (0.38,0.59); (2) the equation of state of dark energy may be less than −1 at 1 σ confidence level at some redshifts in the redshift range (1.3,1.53); (3) there exists accelerated phase at 1 σ confidence level in the redshift range (1.037,1.944). These results may provide possible evidences for physics beyond ΛCDM.

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