摘要
We consider a class of non-homogeneous ultraparabolic differential equations with singular drift terms arising from some physical models,and prove that weak solutions are H?lder continuous,which are sharp in some sense and also generalize the well-known De Giorgi-Nash-Moser theory to degenerate parabolic equations satisfying the H?rmander hypoellipticity condition.The new ingredients are manifested in two aspects:on the one hand,for lower-order terms,we exploit a new Sobolev inequality suitable for the Moser iteration by improving the result of Pascucci and Polidoro(2004);on the other hand,we explore the G-function from an early idea of Kruzhkov(1964)and an approximate weak Poincaréinequality for non-negative weak sub-solutions to prove the H?lder regularity.
基金
supported by National Natural Science Foundation of China(Grant No.12071054)
National Support Program for Young Top-Notch Talents
Dalian High-Level Talent Innovation Project(Grant No.2020RD09)
supported by National Natural Science Foundation of China(Grant Nos.11471320,11631008 and 12031012)。
