7.  Lee Da-Shin  (李大興)

      Department of Physics

      National Dong Hwa University,

      1 Da Hseuh Rd, Sec 2, Shoufeng,

Hwalien 974

      Taiwan

      Email: dslee@phys.ndhu.edu.tw

      Fax: +886-3-8633690

    Title of talk: Influence on electron coherence from quantum electromagnetic fields in the presence of conducting plates

    Abstract: The influence of electromagnetic vacuum fluctuations in the presence of the perfectly conducting plate on electrons is studied with an interference experiment. The evolution of the reduced density matrix of the electron is derived by the method of  influence functional. We find that the plate boundary anisotropically modifies vacuum fluctuations that in turn affect the electron coherence. The path plane of the interference is chosen either parallel or normal to the plate. In the vicinity of the plate, we show that the coherence between electrons due to the boundary is enhanced in the parallel configuration, but reduced in the normal case. The presence of the second parallel plate is found to boost these effects.  The potential relation between the amplitude change and phase shift of interference fringes is pointed out. The finite conductivity effect on electron coherence is discussed.

8.  Lee, Wolung  (李沃龍)

       Department of Physics

       Taiwan Normal University

       88，Sec.4, Ting-Chou Rd,

       Taipei, 116

       Taiwan

       Email: leewl@mail.sinica.edu.tw

       Fax: +86 10 13522150873

     Title of talk: Quantum noise and a low cosmic microwave background quadrupole

     Abstract: Considering the coupling of the inflaton to the quantum environment, we propose that cosmological density perturbations may arise from inflationary fluctuations induced by the colored quantum noise.  A time scale for the growth of

fluctuations naturally emerges in response to the driving force of the noise, resulting in a suppression of large-scale density perturbation. This may explain the observed low quadrupole in the WMAP cosmic microwave background anisotropy data and potentially unveil the initial time of inflation.