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The Phase-space analysis of scalar fields with non-minimally derivative coupling
Yumei Huang, Qing Gao, Yungui Gong
We perform a dynamical analysis for the exponential scalar field with non-minimally derivative coupling. For the quintessence case, the stable fixed points are the same with and wi…
Modified Lyth bound and implications of BICEP2 results
Qing Gao, Yungui Gong, Tianjun Li
To reconcile the BICEP2 measurement on the tensor-to-scalar ratio with Planck constraint, a large negative running of scalar spectral index is needed. So the inflationary…
The Simple Single Field Inflation Models and the Running of Spectral Index
Qing Gao, Yungui Gong, Tianjun Li +1
The BICEP2 experiment confirms the existence of primordial gravitational wave with the tensor-to-scalar ratio ruled out at level. The consistency of this large value of…
The challenge for single field inflation with BICEP2 result
Qing Gao, Yungui Gong
The detection of B-mode power spectrum by the BICEP2 collaboration constrains the tensor-to-scalar ratio for the lensed-CDM model. The consistency of th…
The general property of dynamical quintessence field
Yungui Gong
We discuss the general dynamical behaviors of quintessence field, in particular, the general conditions for tracking and thawing solutions are discussed. We explain what the tracki…