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J. Valiviita, E. Majerotto, and R. Maartens, “Instability in interacting dark energy and dark matter fluids,” JCAP
Original
2008
Cited alongside, same era.
C. L. MacLeod and C. J. Hogan, “Precision of Hubble constant derived using black hole binary absolute distances and statistical redshift information,” Phys. Rev
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2008
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Original
2009
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Then

L. Lombriser and N. A. Lima, “Challenges to Self-Acceleration in Modified Gravity from Gravitational Waves and Large-Scale Structure,” Phys. Lett
Original
2017
Later among the works it cites.
I. Sawicki, I. D. Saltas, M. Motta, L. Amendola, and M. Kunz, “Nonstandard gravitational waves imply gravitational slip: On the difficulty of partially hiding new gravitational degrees of freedom,” Phys. Rev
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2017
Later among the works it cites.
LIGO Scientific, Virgo
Original
2017
Later among the works it cites.
R. F. vom Marttens, L. Casarini, W. S. Hipólito-Ricaldi, and W. Zimdahl, “CMB and matter power spectra with non-linear dark-sector interactions,” JCAP
Original
2017
Later among the works it cites.
LIGO Scientific, Virgo, Fermi-GBM, INTEGRAL

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2019

Dark degeneracy I: Dynamical or interacting dark energy?

von Marttens, Rodrigo, Lombriser, Lucas, Kunz, Martin et al.

Understand

We revisit the dark degeneracy that arises from the Einstein equations relating geometry to the total cosmic substratum but not resolving its individual components separately.

We establish the explicit conditions for the dark degeneracy in the fluid description of the dark sector.
At the background level, this degeneracy can be formally understood in terms of a unified dark sector Equation of State (EoS) that depends both on the dynamical nature of the dark energy (DE) as well as on its interaction with the pressureless dark matter.
For linear perturbations, the degeneracy arises for specified DE pressure perturbations (or sound speed, equivalently) and DE anisotropic stress.