收藏本站  |  联系我们  |  高能所主站  |  中国科学院  |  English
 
 首 页  理论室概况 科研队伍 学术活动 人才培养 科研成果 访问须知 人才需求 下载专区 HETH-Forum CFHEP
 
  当前位置:首页>学术活动>学术报告  
学术活动  
学术报告
学术会议
理论室青年论坛
学术报告
[4.9]Spin and Long-Range Forces: The Unfinished Tale of the Last Massless Particle
文章来源:  |  发布时间:2014-04-08  |  浏览:

                             Seminar

Title: Spin and Long-Range Forces:

       The Unfinished Tale of the Last Massless Particle 

Speaker: Prof. Philip Schuster (Perimeter Institute)  

Time: 3:00PM, April 9th (Wednesday) 

Place: Theoretical Physics Division319 

Abstract:
The success of gauge theory descriptions of Nature follows simply, in hindsight, from Lorentz symmetry, quantum mechanics, and the existence of interacting massless particles with spin. Yet, remarkably, the most generic type of massless particle spin has never been seriously examined: Wigner's so-called "continuous spin" particles (CSPs), which have a tower of polarization states carrying all integer or half-integer helicities that mix under boosts. I will explain recent progress in understanding these particles on two fronts: simple scattering amplitudes and a free quantum field theory. The scattering amplitudes give two remarkable insights into CSP physics. First, Lorentz symmetry protects CSP interactions from the dysfunction one might expect in a theory with infinitely many polarization states: divergent cross-sections and problematic thermodynamics. Second, and most intriguingly, CSP interactions approach those of ordinary scalars or helicity-1 or 2 gauge bosons in a high-energy "correspondence" regime. While a full interacting theory of CSPs remains elusive, these results suggest that any such theory would extend Maxwell electrodynamics and/or general relativity in a viable and testable way. 
 

附件
版权所有 © 中国科学院高能物理研究所理论物理研究室 京ICP备05002790号
地址:北京市石景山区玉泉路19号乙院918-4 邮编:100049