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M. Gary, D. Grumiller, M. Riegler, J. Rosseel:
"Flat space (higher spin) gravity with chemical potentials";
Journal Of High Energy Physics, 1501 (2015), S. 152.

We introduce flat space spin-3 gravity in the presence of chemical potentials and discuss some applications to flat space cosmology solutions, their entropy, free energy and flat space orbifold singularity resolution. Our results include flat space Einstein gravity with chemical potentials as special case. We discover novel types of phase transitions between flat space cosmologies with spin-3 hair and show that the branch that continuously connects to spin-2 gravity becomes thermodynamically unstable for sufficiently large temperature or spin-3 chemical potential.

http://dx.doi.org/10.1007/JHEP01(2015)152

http://arxiv.org/abs/arXiv:1411.3728