论文标题
刚性分层
The Stratification of Rigidity
论文作者
论文摘要
我们表明，所有平面的主体基础存在，无质量的四维理论中的两环幅度均具有刚度的完全分层 - 每个集成均为纯且严格地是polysogarithmic，或（纯且（纯净的）严格的Elliptic-Polylylogarithmicic，每个集成都涉及后来的单个Elliptic curve。可以说这样的集成具有明确的刚性。
We show that a master integrand basis exists for all planar, two-loop amplitudes in massless four-dimensional theories which is fully stratified by rigidity -- with each integrand being either pure and strictly polylogarithmic or (pure and) strictly elliptic-polylogarithmic, with each of the later involving a single elliptic curve. Such integrands can be said to have definite rigidity.
