Kyoung Yee Kim, Hyung Won Lee, Yun Soo Myung
We investigate the linearly (quadratically) coupled cubic Galileon models which may explain the late-time acceleration. In these cases, we need two equations of state parameter named the native and effective equations of state to test whether the universe is accelerating or not because there is coupling between the cold dark matter and Galileon. It turns out that there is no transition from accelerating phase to phantom phase in the future.
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http://arxiv.org/abs/1307.8312
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