113 citations · 478 across the 8 of their papers we have counts for
6 papers · 1 filter
Effective Field Theory and Decoupling in Multi-field Inflation: An Illustrative Case Study
Gary Shiu, Jiajun Xu
We explore the effects of heavy degrees of freedom on the evolution and perturbations of light modes in multifield inflation. We use a simple two-field model as an example to illus…
Comment on Asymptotically Safe Inflation
S. -H. Henry Tye, Jiajun Xu
We comment on Weinberg's interesting analysis of asymptotically safe inflation (arXiv:0911.3165). We find that even if the gravity theory exhibits an ultraviolet fixed point, the e…
A Meandering Inflaton
S. -H. Henry Tye, Jiajun Xu
If the cosmological inflationary scenario took place in the cosmic landscape in string theory, the inflaton, the scalar mode responsible for inflation, would have meandered in a co…
Duality Cascade in Brane Inflation
Rachel Bean, Xingang Chen, Girma Hailu +2
We show that brane inflation is very sensitive to tiny sharp features in extra dimensions, including those in the potential and in the warp factor. This can show up as observationa…
Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations
Rachel Bean, Xingang Chen, Hiranya V. Peiris +1
We compare the Infrared Dirac-Born-Infeld (IR DBI) brane inflation model to observations using a Bayesian analysis. The current data cannot distinguish it from the \LambdaCDM model…
Is Brane Inflation Eternal?
Xingang Chen, Sash Sarangi, S. -H. Henry Tye +1
In this paper, we show that eternal inflation of the random walk type is generically absent in the brane inflationary scenario. Depending on how the brane inflationary universe ori…