Papers › The integrated Sachs-Wolfe effect in the AvERA cosmology
The integrated Sachs-Wolfe effect in the AvERA cosmology
Róbert Beck, István Csabai, Gábor Rácz, István Szapudi
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The recent AvERA cosmological simulation of R\'acz et al. (2017) has a ΛCDM-like expansion history and removes the tension between local and Planck (cosmic microwave background) Hubble constants. We contrast the AvERA prediction of the integrated Sachs--Wolfe (ISW) effect with that of ΛCDM. The linear ISW effect is proportional to the derivative of the growth function, thus it is sensitive to small differences in the expansion histories of the respective models. We create simulated ISW maps tracing the path of light-rays through the Millennium XXL cosmological simulation, and perform theoretical calculations of the ISW power spectrum. AvERA predicts a significantly higher ISW effect than ΛCDM, A=1.93-5.29 times larger depending on the l index of the spherical power spectrum, which could be utilized to definitively differentiate the models. We also show that AvERA predicts an opposite-sign ISW effect in the redshift range z ≈1.5 - 4.4, in clear contrast with ΛCDM. Finally, we compare our ISW predictions with previous observations. While at present these cannot distinguish between the two models due to large error bars, and lack of internal consistency suggesting systematics, ISW probes from future surveys will tightly constrain the models.
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