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Mahnaz Asghari, Jose Beltrán Jiménez, Shahram Khosravi, and David F. Mota, “On structure formation from a small-scales-interacting dark sector,” JCAP 04
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1902
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1910
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1910
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Zvonimir Vlah, Nora Elisa Chisari, and Fabian Schmidt, “An EFT description of galaxy intrinsic alignments,” JCAP 01
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1910
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2007
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2007
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2011
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Original
2011
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Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo, Florencia A. Teppa Pannia, and Shinji Tsujikawa, “Velocity-dependent interacting dark energy and dark matter with a Lagrangian description of perfect fluids,” JCAP 03
Original
2012
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Original
2012
Cited alongside, same era.
Benjamin Audren, Julien Lesgourgues, Karim Benabed, and Simon Prunet, “Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code,” JCAP 1302
Original
2013
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2014
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Then

Nils Schöneberg, Guillermo Franco Abellán, Andrea Pérez Sánchez, Samuel J. Witte, Vivian Poulin, and Julien Lesgourgues, “The H 0 H_{0} Olympics: A fair ranking of proposed models,” (2021), arXiv:2107.10291 [astro-ph.CO]
Original
2021
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Original
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2022

The Sigma-8 Tension is a Drag

Poulin, Vivian, Bernal, José Luis, Kovetz, Ely et al.

Understand

Measurements of weak gravitational lensing at low redshifts ($z\lesssim 0.5-1$), quantified by the parameter $S_8$, favor weaker matter clustering than that expected from the standard $\Lambda$CDM cosmological model with parameters determined by cosmic microwave background (CMB) measurements.

However, the amplitude of matter clustering at higher redshifts, as probed by lensing of the CMB, is consistent with $\Lambda$CDM.
This apparent paradox suggests a connection between the $S_8$ tension and the transition from matter to dark-energy domination.
Here we show that the tension can be resolved by introducing a friction between dark matter and dark energy without altering the tightly constrained expansion history.