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The relation of a scalar field with a perfect fluid has generated some debate along the last few years.
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N. Arkani-Hamed, H.C. Cheng, M.A. Luty and S. Mukohyama, “Ghost condensation and a consistent infrared modification of gravity,” JHEP 0405
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2010
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2011
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C. Armendariz-Picon, T. Damour and V.F. Mukhanov, “k-Inflation,” Phys. Lett. B 458
2006
Cited alongside, same era.
2013
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