来源:本站 作者: 发布时间:2013-05-20
3:00PM, 21 May 2013 (Tuesday) 2013年5月21日(星期二)下午3点
Physics Building room 323 (Lecture Hall), Sichuan University 四川大学物理馆323室(学术报告厅)
Professor Yeuk-Kwan Edna Cheung, Ph.D. Supervisor, Ph.D. in 2000 at Princeton University 张若筠 教授, 博士生导师, 美国普林斯顿大学2000年博士 (Theoretical Physics Lab, Physics School of Nanjing University 南京大学物理系理论物理研究中心)
Dual Cosmos --- Duality between Scale-invariant and Amplitude-invariant Perturbation Spectra in Inflationary and Bouncing Cosmos
We present a model independent framework to analyze early-universe models. In view of the latest developments in model building, we promote "m" in the red-blue shift term m*H_\chi into the free parameter. Combined with \nu, the power-law index of cosmological background, we construct a two dimensional parameter space. All cosmological models with modified red-blue shift term can henceforth be classified into a point into the parameter space, and the global properties of these cosmological models can be also illustrated:
1) A two-dimensional parameter region of the time-invariance of power spectrum for physical stabilities are obtained;
2) Two group of scale-invariant solutions are delineated inside/outside of the time-invariant region respectively according to their time-dependence;
3) A new duality between scale-invariance and time-invariance of spectra is unveiled, in this parameter space.
As a cosmological application of this new duality, we predict and show that the curvature perturbation of Coupled Scalar-Tachyon Fields Bouncing Cosmos is physically scale-invariant, and it is dual to the Slow-Roll Inflation Model in this new duality.