@article{d46b523c324e4fc79ee0067c98b20716,
title = "Palatini formulation of modified gravity with squared scalar curvature",
abstract = "In this paper we show that in the Palatini formulation of modified gravity, a R 2 term cannot lead to an early time inflation, in opposite to the well-known conclusion when considering this model in the metric formulation.",
keywords = "Cosmology, Dark energy, Modified gravity",
author = "Xinhe Meng and Peng Wang",
note = "Funding Information: We would especially like to thank Professor Sergei Odintsov for a careful reading of the manuscript and many very helpful comments, which have improved this paper greatly. Specially, he told us the non-unitarity problem in R2 gravity and suggested reconsidering this problem in Palatini formalism. We would also like to thank Professors Sean Carroll, {\'E}anna Flanagan, Nadeem Haque, Shin{\textquoteright}ichi Nojiri, Mark Trodden and A. A Starobinsky for helpful discussions and Professors Mauro Francaviglia and Igor Volovich for helping us finding their earlier works. This work is partly supported by China NSF, Doctoral Foundation of National Education Ministry and an ICSC-World laboratory scholarship.",
year = "2004",
month = dec,
doi = "10.1023/B:GERG.0000048981.40061.63",
language = "English",
volume = "36",
pages = "2673--2680",
journal = "General Relativity and Gravitation",
issn = "0001-7701",
publisher = "Springer New York",
number = "12",
}