Is it just systematic error, carnivorous Dark Energy, sterile neutrinos or modified gravity?Catherine Heymans of the University of Edinburgh describes the research as "a fascinating result", and points out that it is part of a larger effort to reconcile discrepancies (or "tensions") between measurements made by Planck and those from other telescopes. "Other researchers have said that this tension can be resolved if the dark-matter particle is a sterile neutrino," she explains, adding, "others still are looking at different modified-gravity theories to explain the result."
Heymans also points out that the tension could be the result of systematic errors in how one or more of the observations are made. "More data and further meticulous analysis of those data and the systematics that might be associated with them are the way to find out if this fascinating theory could be true," she cautions.
Thanks for a specific link! Just noting that the paper you link to is