27,267 research outputs found
Coherent Perfect Rotation
Two classes of conservative, linear, optical rotary effects (optical activity
and Faraday rotation) are distinguished by their behavior under time reversal.
In analogy with coherent perfect absorption, where counterpropagating light
fields are controllably converted into other degrees of freedom, we show that
only time-odd (Faraday) rotation is capable of coherent perfect rotation in a
linear and conservative medium, by which we mean the complete transfer of
counterpropagating coherent light fields into their orthogonal polarization.
This highlights the necessity of time reversal odd processes (not just
absorption) and coherence in perfect mode conversion and may inform device
design.Comment: 4 pages, 2 figure
QCD: Challenges for the Future
Despite many experimental verifications of the correctness of our basic
understanding of QCD, there remain numerous open questions in strong
interaction physics and we focus on the role of future colliders in addressing
these questions. We discuss possible advances in the measurement of ,
in the study of parton distribution functions, and in the understanding of low
physics at present colliders and potential new facilities. We also touch
briefly on the role of spin physics in advancing our understanding of QCD.Comment: 12 pages, LATEX2e with snow2e, epsfig and 2 figures. Also available
at http://penguin.phy.bnl.gov/~dawson/qcdsnow.ps . QCD working group summary
at DPF/DPB Summer Study on New Directions for High Energy Physics, Snowmass,
CO, June 25- July 12, 199
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