5 research outputs found
Toric self-dual Einstein metrics as quotients
We use the quaternion Kahler reduction technique to study old and new
self-dual Einstein metrics of negative scalar curvature with at least a
two-dimensional isometry group, and relate the quotient construction to the
hyperbolic eigenfunction Ansatz. We focus in particular on the
(semi-)quaternion Kahler quotients of (semi-)quaternion Kahler hyperboloids,
analysing the completeness and topology, and relating them to the self-dual
Einstein Hermitian metrics of Apostolov-Gauduchon and Bryant.Comment: 30 page
Bach-flat asymptotically locally Euclidean metrics
We obtain a volume growth and curvature decay result for various classes of
complete, noncompact Riemannian metrics in dimension 4; in particular our
method applies to anti-self-dual or Kahler metrics with zero scalar curvature,
and metrics with harmonic curvature. Similar results are known for Einstein
metrics, but our analysis differs from the Einstein case in that (1) we
consider more generally a fourth order system in the metric, and (2) we do not
assume any pointwise Ricci curvature bound.Comment: 54 pages; final versio