55 citations · 151 across the 9 of their papers we have counts for
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astro-ph.CO2013
Testing the effects from dark radiation
Yi Zhang, Yungui Gong
In this letter, the effects of dark radiation (DR) are tested. Theoretically, the phase-space analysis method is applied to check whether the model is consist with the history of o…
astro-ph.CO2009★ 11 cited
Noether Symmetry Approach in "Cosmic Triad" Vector Field Scenario
Yi Zhang, Yun-gui Gong, Zong-Hong Zhu
To realize the accelerations in the early and late periods of our universe, we need to specify potentials for the dominant fields. In this paper, by using the Noether symmetry appr…
astro-ph.CO2009★ 10 cited
The Slow-Roll and Rapid-Roll Conditions in the Space-like Vector Field Scenario
Yi Zhang
In this note we derive the slow-roll and rapid-roll conditions for the minimally and non-minimally coupled space-like vector fields. The function represents the non-mini…