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In this paper, using and implementing a new line of sight CMB code, calledCMBAns [1], that allows us to modify H(z) for any given feature at any redshiftwe study the effect of changes in the expansion history of the Universe on theCMB power spectrum. Motivated by the detailed analytical calculations of theeffects of the changes in H(z) on ISW plateau and CMB low multipoles, we studytwo phenomenological parametric form of the expansion history using WMAP dataand through MCMC analysis. Our MCMC analysis shows that the standard LCDMcosmological model is consistent with the CMB data allowing the expansionhistory of the Universe vary around this model at different redshifts. However,our analysis also shows that a decaying dark energy model proposed in [2] hasin fact a marginally better fit than the standard cosmological constant modelto CMB data. Concordance of our studies here with the previous analysis showingthat Baryon Acoustic Oscillation (BAO) and supernovae data (SN Ia) also prefermildly this decaying dark energy model to LCDM, makes this finding interestingand worth further investigation.

ISW effect as probe of features in the expansion history of the Universe