物理学院 School of Physics, Nanjing University

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Bound to Bounce -- Testing Bounce Universe at CEPC

2015年12月21日


报告人:张若筠教授
报告时间:12月22日
 中午1200
报告地点:唐楼 B501
Title:Bound to Bounce -- Testing Bounce Universe at CEPC

Abstract:We report a successful bounce model derived from string theory (Coupled Scalar Tachyon Bounce universe model, or CSTB universe 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.

a short bio:

Education:
• Graduate Program in Theoretical High Energy Physics [Sept. 1995–June 2000] Ph.D., Princeton University, May 2000;
• Undergraduate Program in Physics [Sept 92 – Dec 94] B.A., University of California at Berkeley,  December 1994, with Honours in Physics and High Distinction in General Scholarship;
• Queen Elizabeth Secondary School, Hong Kong, “A-Level,” June 1992.

Research Experience:
• Professor of Physics, Nanjing University, July 2006 – present;
• Associate Professor, Center for Mathematical Sciences, Zhejiang University, Dec. 2005 – July 2006;
• Staff, National Center for Theoretical Sciences, Hsinchu, Taiwan, Aug. 2005 – Oct. 2005;
• Visiting Researcher in String Theory, Perimeter Institute, Mar–June 2002; September 2003–August 2005;
• John A. McCone Postdoctoral Fellow in String Theory, Caltech, 2000–2003, Sponsor: Prof. John H. Schwarz;
• Ph. D. Thesis Research on String Theory, 1997–2000, Advisor: Prof. Ori J. Ganor, Princeton U;
• Undergraduate Research Assistantship on Experimental Condensed Matter, 1995 Advisor: Prof. John Clarke, UC Berkeley;
• Honour in Physics Thesis Research on Mathematical Modelling of the Chromosome, 1995 Advisor: Prof. Rainer Sachs, UC Berkeley.

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