Completely exceptional 2nd order PDEs via conformal geometry and BGG resolution

详细信息    查看全文

• 作者：Jan Gutt^a ; ^{jgutt@cft.edu.pl} ; Gianni Manno^b ; ^{giovanni.manno@polito.it} ; Giovanni Moreno^c ; ^{gmoreno@impan.pl}
• 关键词：30 ; 80
• 刊名：Journal of Geometry and Physics
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：113
• 期：Complete
• 页码：86-103
• 全文大小：775 K
• 卷排序：113

文摘

By studying the development of shock waves out of discontinuity waves, in 1954 P. Lax discovered a class of PDEs, which he called “completely exceptional”, where such a transition does not occur after a finite time. A straightforward integration of the completely exceptional conditions allowed Boillat to show that such PDEs are actually of Monge–Ampère type. In this paper, we first recast these conditions in terms of characteristics, and then we show that the completely exceptional PDEs, with 2 or 3 independent variables, can be described in terms of the conformal geometry of the Lagrangian Grassmannian, where they are naturally embedded. Moreover, for an arbitrary number of independent variables, we show that the space of rrth degree sections of the Lagrangian Grassmannian can be resolved via a BGG operator. In the particular case of 1st degree sections, i.e., hyperplane sections or, equivalently, Monge–Ampère equations, such operator is a close analogue of the trace-free second fundamental form.