Mathematics – Differential Geometry
Scientific paper
2007-12-08
Mathematics
Differential Geometry
14 pages. case. v.4--Added formula for the f-laplacian of the curvature operator and applications
Scientific paper
We show that the only complete shrinking gradient Ricci solitons with
vanishing Weyl tensor are quotients of the standard ones. This gives a new
proof of the Hamilton-Ivey-Perel'man classification of 3-dimensional shrinking
gradient solitons. We also prove a classification for expanding gradient Ricci
solitons with constant scalar curvature and suitably decaying Weyl tensor.
Petersen Peter
Wylie William
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