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As we all know, for a Riemannian manifold $(M,g)$, there exists a unique torsion free connection $\Delta_g$, \nabla_g$, the Levi-Civita connection, that is compatible witht metric.

I was wondering if one can reverse this situation: Given a manifold with $M$ with connection $\Delta$, \nabla$, when does there exist a Riemannian metric $g$ for which $\Delta$ \nabla$ is the Levi-Civita connection.

If this were true for complex projective manifolds it would make me be very happy.

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When can a Connection Induce a Riemannian Metric for which it is the Levi--Civita Levi-Civita Connection?

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As we all know, for a Riemannian manifold $(M,g)$, there exists a unique torsion free connection $\nabla_g$, he Levi--Civita \Delta_g$, the Levi-Civita connection, that is compatible witht metric.

I was wondering if one can reverse this situation: Given a manifold with $M$ with connection $\Delta$, when does there exist a Riemannian metric $g$ for which $\Nabla$ \Delta$ is the Levi--Civita Levi-Civita connection.

If this were true for complex projective manifolds it would make me be very happy.

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