Hao Wei, Jing Liu, Zu-Cheng Chen, Xiao-Peng Yan
The current accelerated expansion of our universe could be due to an unknown energy component with negative pressure (dark energy) or a modification to general relativity (modified gravity). On the other hand, recently warm dark matter (WDM) remarkably rose as an alternative of cold dark energy (CDM). Obviously, it is of interest to distinguish these different types of models. In fact, many attempts have been made in the literature. However, in this work we show that WDM, modified gravity and coupled CDM form a trinity, namely, they are indistinguishable by using the cosmological observations of both cosmic expansion history and growth history. Therefore, to break the degeneracy, the other complementary probes beyond the ones of cosmic expansion history and growth history are required.
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http://arxiv.org/abs/1306.1364
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