Topic: Missing Mass?

[Nemesis]

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The amount of lensing provides a way to estimate galactic mass, and that's what the new studies focus on. Only one of the studies, from the Weighing the Giants (WtG) project, has been published – here – and its authors say that with a robust calibration of “weak lensing”, the discrepancies in the Planck estimates can be resolved.

The WtG project sampled 22 of the galactic clusters also measured by Planck, and comes up with a mass estimate that's 43 per cent higher than the mass predicted by Planck's use of the Sunyaev–Zel’dovich effect.

“Adopting the WtG weak-lensing-based mass calibration would substantially reduce the tension found between the Planck cluster count cosmology results and those from CMB temperature anisotropies,” the group writes.