We obtain upper and lower estimates for the Green function for a second order noncoercive differential operator on a homogeneous manifold of negative curvature.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm88-1-9, author = {Roman Urban}, title = {Noncoercive differential operators on homogeneous manifolds of negative curvature and their Green functions}, journal = {Colloquium Mathematicae}, volume = {89}, year = {2001}, pages = {121-134}, zbl = {0968.22007}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm88-1-9} }
Roman Urban. Noncoercive differential operators on homogeneous manifolds of negative curvature and their Green functions. Colloquium Mathematicae, Tome 89 (2001) pp. 121-134. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm88-1-9/