When I study 5-dimensional $\mathcal{N} = 1$ supersymmetry, I came across such structure as follows.

$(R, \kappa, \Phi, M)$ is an almost contact 5-manifold, such that \begin{equation} \kappa \left( R \right) = 1,\;\;\;\;\Phi R = \kappa \circ \Phi = 0,\;\;\;\;{\Phi ^2} = - 1 + \kappa \otimes R. \end{equation} Supersymmetry requires these quantities satisfy an extra condition: \begin{equation} {N_\Phi }\left( {X,Y} \right) + d\kappa \left( {\Phi X,\Phi Y} \right) = 0,\;\;\;\;\text{for} \; \kappa(X) = \kappa(Y) = 0\;\;\;\;\;\;\;\;\;\;\;(*) \end{equation} where ${N_\Phi }\left( {X,Y} \right) \equiv {\Phi ^2}\left[ {X,Y} \right] + \left[ {\Phi X,\Phi Y} \right] - \Phi \left[ {\Phi X,Y} \right] - \Phi \left[ {X,\Phi Y} \right]$.

1) If $d\kappa \left( {\Phi X,\Phi Y} \right) = d\kappa \left( {X,Y} \right) \Leftrightarrow \kappa \left( {\left[ {X,\Phi Y} \right] + \left[ {\Phi X,Y} \right]} \right) = 0$, then the structure is Cauchy-Riemann.

2) $(*)$ implies \begin{equation} \left[ {{X^{1,0}},{Y^{1,0}}} \right] = {Z^{1,0}} - d\kappa \left( {{X^{1,0}},{Y^{1,0}}} \right)R, \end{equation} which further implies ${\left( {d{\omega ^{0,1}}} \right)^{2,0}} = 0$, and therefore I naively think we have usual decomposition $d = d_V + \partial + \bar\partial$.

So my question is whether the almost contact structure with $(*)$ is studied somewhere? Reference would be great!


Let me ask a enhanced version of question. Suppose the (1,0)+(0,1) decomposition induced by the almost contact structure satisfies the conditions (for some $Z^{1,0}$ and $Z'^{1,0}$ ) \begin{equation} \left[ {{X^{1,0}},{Y^{1,0}}} \right] = {Z^{1,0}} - d\kappa \left( {{X^{1,0}},{Y^{1,0}}} \right)R, \end{equation} \begin{equation} \left[ {{X^{1,0}},R} \right] = {Z'^{1,0}} - \left( {...} \right)R, \end{equation}

does it mean that one can find special local coordinates $(\theta, z_{1,2}, \bar z_{1,2})$, such that the transformations between the coordinates take the form \begin{equation} \begin{array}{l} z' = f\left( z \right)\\ \theta ' = \theta + g\left( {z,\bar z} \right) \end{array} \end{equation}

  • $\begingroup$ Notation: $R$ is a vector field, $\kappa$ a 1-form and $\Phi$ an endomorphism of the tangent bundle? $\endgroup$ – Ben McKay Sep 8 '14 at 15:34
  • $\begingroup$ @BenMcKay:Yes they are. $\endgroup$ – Lelouch Sep 8 '14 at 16:23

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