Approximately Einstein ACH metrics, volume renormalization, and an invariant for contact manifolds

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dc.creatorSeshadri, Neil
dc.date2007-07-04
dc.date2007-10-10
dc.date.accessioned2026-07-07T12:59:46Z
dc.date.available2026-07-07T12:59:46Z
dc.descriptionTo any smooth compact manifold $M$ endowed with a contact structure $H$ and partially integrable almost CR structure $J$, we prove the existence and uniqueness, modulo high-order error terms and diffeomorphism action, of an approximately Einstein ACH (asymptotically complex hyperbolic) metric $g$ on $M\times (-1,0)$. We consider the asymptotic expansion, in powers of a special defining function, of the volume of $M\times (-1,0)$ with respect to $g$ and prove that the log term coefficient is independent of $J$ (and any choice of contact form $θ$), i.e., is an invariant of the contact structure $H$. The approximately Einstein ACH metric $g$ is a generalisation of, and exhibits similar asymptotic boundary behaviour to, Fefferman's approximately Einstein complete Kähler metric $g_+$ on strictly pseudoconvex domains. The present work demonstrates that the CR-invariant log term coefficient in the asymptotic volume expansion of $g_+$ is in fact a contact invariant. We discuss some implications this may have for CR $Q$-curvature. The formal power series method of finding $g$ is obstructed at finite order. We show that part of this obstruction is given as a one-form on $H^*$. This is a new result peculiar to the partially integrable setting.
dc.descriptionMinor typographical corrections
dc.identifierhttps://arxiv.org/abs/0707.0597
dc.identifierhttp://arxiv.org/abs/0707.0597
dc.identifierBull. Soc. Math. France 137 (2009) 63--91
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225674
dc.subjectDifferential Geometry
dc.titleApproximately Einstein ACH metrics, volume renormalization, and an invariant for contact manifolds
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