an:03949220
Zbl 0591.53030
Blair, D. E.; Ianus, S.
Critical associated metrics on symplectic manifolds
EN
Nonlinear problems in geometry, Proc. AMS Spec. Sess., 820th Meet. AMS, Mobile/Ala. 1985, Contemp. Math. 51, 23-29 (1986).
1986
a
53C15 53C55
critical metrics; scalar curvature; symplectic structure; Ricci operator; almost complex structure; Goldberg conjecture
[For the entire collection see Zbl 0579.00012.]
Let R be the scalar curvature and \(R^*\) the *-scalar curvature on a compact symplectic Riemannian manifold M. The authors consider the integrals \(\int_{M}R dV\) and \(\int_{M}(R-R^*) dV\) as functions on the set of all metrics associated to the symplectic structure. For both these functions they show that the critical points are associated metrics for which the Ricci operator commutes with the corresponding almost complex structure. Thus, K??hler metrics, when they exist, are maximum points for the second function.
Concerning the Goldberg conjecture and further development I think that the second-derivative test for extrema is important.
C.Udri??te
Zbl 0579.00012