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I've heard that on a Kaehler manifold $(M,g_0)$, if you evolve the metric $g$ by Ricci flow $\partial g_{ij}(t)/\partial t=-2R_{ij}$, and $g(0)=g_0$, then you always have $g(t)$ is a Kaehler metric on $M$.

All the references I saw refer this fact to that the holonomy group of $(M,g(t))$ is preserved under Ricci flow, but I don't know how to prove it.

Any comments are welcome.

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I know it is not too much, but I can suggest Chow's "The Ricci Flow: an introduction". You can find it for download here: 4shared.com/office/xU-k3g2N/the_ricci_flowan_introduction_.html –  matgaio Apr 30 '12 at 19:36
    
In the case $M$ is simply connected this should follow since the Holonomy group changes continously with $t$ and by the Berger Holonomy classification this means that it must be constant. –  wspin Sep 5 at 8:39

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