135 citations · 445 across the 12 of their papers we have counts for
5 papers · 1 filter
Galilean Islands in Eternally Inflating Background
Zhi-Guo Liu, Yun-Song Piao
We show that the observational universe may emerge classically from a de Sitter background with low energy scale. We find, after calculating the curvature perturbation, that the re…
A Galileon Design of Slow Expansion: II
Zhi-Guo Liu, Yun-Song Piao
We parameterize the evolutions of the slow expansion, which emerges from a static state in infinite past, into different classes. We show that the scale invariant adiabatical pertu…
Phantom Inflation in Little Rip
Zhi-Guo Liu, Yun-Song Piao
We study the phantom inflation in little rip cosmology, in which the current acceleration is driven by the field with the parameter of state w < -1, but since w tends to -1 asympto…
Scalar Perturbations Through Cycles
Zhi-Guo Liu, Yun-Song Piao
We analytically and numerically investigate the evolutions of the scalar perturbations through the cycles with nonsingular bounce. It is found that the amplitude of the curvature p…
Phantom Inflation with A Steplike Potential
Zhi-Guo Liu, Jun Zhang, Yun-Song Piao
The phantom inflation predicts a slightly blue spectrum of tensor perturbation, which might be tested in coming observations. In normal inflation models, the introduction of step i…