arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0310274math.AP
收藏

辐射场是一个傅里叶积分算子

The radiation field is a Fourier integral operator

Antonio Sa Barreto, Jared Wunsch

摘要:

我们展示了“辐射场”的形式,它描述了没有被捕获射线的流形上波动方程解的大尺度、长时间行为,作为一个傅里叶积分算子。我们工作在两个不同的几何设置:散射流形(一类,其中包括渐近欧几里得空间)和渐近双曲流形。辐射场算子的正则关系是从流形的余切丛到无穷远处边界上的余切丛的映射;它与测地线的逗留时间或Busemann函数相关联。在非退化情况下,算子的符号可以用长时间测地流的几何形式来描述。作为上述结果的结果,我们得到的散射理论泊松算子,更好地称为爱森斯坦函数在渐近双曲的情况下的(分布)高频渐近的描述。

英文摘要:

We exhibit the form of the ``radiation field,'' describing the large-scale, long-time behavior of solutions to the wave equation on a manifold with no trapped rays, as a Fourier integral operator. We work in two different geometric settings: scattering manifolds (a class which includes asymptotically Euclidean spaces) and asymptotically hyperbolic manifolds. The canonical relation of the radiation field operator is a map from the cotangent bundle of the manifold to a cotangent bundle over the boundary at infinity; it is associated to a sojourn time, or Busemann function, for geodesic rays. In non-degenerate cases, the symbol of the operator can be described explicitly in terms of the geometry of long-time geodesic flow. As a consequence of the above result, we obtain a description of the (distributional) high-frequency asymptotics of the scattering-theoretic Poisson operator, better known as the Eisenstein function in the asymptotically hyperbolic case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑