题 目： Bound to Bounce -- an alternative to inflation
Edna Cheung 教授 南京大学物理学院
物理楼 333 报告厅
We report a successful bounce model derived from string theory (Coupled Scalar Tachyon Bounce universe model, or CSTB cosmos for short) which solves the horizon, flatness and the big bang singularity problems. The spectrum of primordial density perturbations it produces matches that of CMB and it is stable in the course of cosmic evolution. It does not contain unphysical states, the ``ghosts'' or "phantom" and does not violate the Null Energy condition. The signature predictions of this bounce model can be cross-checked by Dark Matter detection experiments. The CSTB universe model opens up new venues to rethink the mechanisms of matter production as well as baryon asymmetry generation which can be fundamentally different from the Standard Inflationary Cosmology. Efforts to build more sophisticated alternatives to the inflationary paradigm utilising more symmetries and dualities from the String Theory, or beyond, can also be foreseen.