We obtain another proof of a Gaussian upper estimate for a gradient of the heat kernel on cofinite covering graphs whose covering transformation group has a polynomial volume growth. It is proved by using the temporal regularity of the discrete heat kernel obtained by Blunck [2] and Christ [3] along with the arguments of Dungey [7] on covering manifolds.
@article{AMBP_2007__14_1_93_0, author = {Ishiwata, Satoshi}, title = {Discrete version of Dungey's proof for the gradient heat kernel estimate on coverings}, journal = {Annales math\'ematiques Blaise Pascal}, volume = {14}, year = {2007}, pages = {93-102}, doi = {10.5802/ambp.229}, zbl = {1137.60033}, language = {en}, url = {http://dml.mathdoc.fr/item/AMBP_2007__14_1_93_0} }
Ishiwata, Satoshi . Discrete version of Dungey’s proof for the gradient heat kernel estimate on coverings. Annales mathématiques Blaise Pascal, Tome 14 (2007) pp. 93-102. doi : 10.5802/ambp.229. http://gdmltest.u-ga.fr/item/AMBP_2007__14_1_93_0/
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