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Indistinguishable macroscopic behaviour of Palatini gravities and general relativity (2009)
Journal Article
Li, B., Mota, D., & Shaw, D. (2009). Indistinguishable macroscopic behaviour of Palatini gravities and general relativity. Classical and Quantum Gravity, 26(5), https://doi.org/10.1088/0264-9381/26/5/055018

We show that, within some modified gravity theories, such as the Palatini models, the nonlinear nature of the field equations implies that the usual naïve averaging procedure (replacing the microscopic energy–momentum by its cosmological average) cou... Read More about Indistinguishable macroscopic behaviour of Palatini gravities and general relativity.

A Nonuniform Dark Energy Fluid: Perturbation Equations (2008)
Journal Article
Halle, A., Zhao, H., & Li, B. (2008). A Nonuniform Dark Energy Fluid: Perturbation Equations. Astrophysical Journal Supplement, 177(1), 1-13. https://doi.org/10.1086/587744

We propose that galactic dark matter can be described by a nonuniform dark energy fluid. The underlying field is a decaying vector field, which might corresponds to a photon-like but massive particle of 4 degrees of dynamical freedom. We propose a ve... Read More about A Nonuniform Dark Energy Fluid: Perturbation Equations.