Let $X$ be a compact complex manifold in Fujiki class $\mathcal C$, that is bimeromorphic to a compact Kähler manifold, let $T$ be a Kähler current of $X$, then we have the De Rham class $[T]\in H^{1,1}(X,\mathbb R)$, pick a smooth form $\tau$ in the same class as $[T]$, then does the wedge map $\tau^q\wedge :H^0(X,\Omega^{n-q})\to H^q(X,\Omega^n)$ induces a surjective map?


This theorem is already known for the Kähler case, for a compact Kähler manifold $X$, replace here $\tau$ by a Kähler form $\omega$, then the wedge map $\omega^q\wedge:H^0(X,\Omega^{n-q})\to H^q(X,\Omega^n)$ induces a surjective map. What if we generalize the Kähler case to Fujiki class $\mathcal C$？ do we have a similar conclusion as stated above? Does anyone knows any reference about this problem?


Added:from [Ang14](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.744.4158&rep=rep1&type=pdf), page7 theorem 0.10, we know



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> For a compact manifold $X$ endowed with a symplectic structure $\omega$, $X$ satisfies the hard Lefschetz conditon and $X$ satisfies the $dd^{\wedge}$-lemma (namely, every $d$-exact $d^{\wedge}$-closed form being $dd^{\wedge}$-exact) are equivalent.
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see the same page for the defintion of $d^{\wedge}$. So this provides a special case of our question, that is if we further assume $\tau$ being a symplectic form and the $dd^{\wedge}$-lemma is satisfied, the map $\tau^q\wedge :H^0(X,\Omega^{n-q})\to H^q(X,\Omega^n)$ is a surjective map.
But our original problem remained open.



Hard Lefschetz theorem for non-Kähler manifolds
I think that the answer to your question is no.


In order to construct a counter-example, the idea is the following: let $T$ be a Kahler current, and $E$ a $d$-closed positive current on a compact complex $3$-fold $X$ such that $T^3>0$ and $E^3<0$. Then, for $t>0$, the current $S\_t:=T+tE$ is a Kahler current. Under the above conditions, you can find $t>0$ such that $S\_t^3=0$. Indeed, $S\_t^3=T^3+3tT^2E+3t^2TE^2+t^3E^3$ and for $t=0$, $S\_0^3=T^3>0$ while for $t\to \infty$, $S\_t^3<0$, so there is a $t>0$ so that $S\_t^3=0$.


Now, for this $t$, denote by $\tau\_t$ a smooth representative of the class of $S\_t$. Then $\tau\_t^3=0$. Now for instance, for $q=n=3$, the map $\tau\_t^3\wedge:H^0(X,\Omega^0)\to H^3(X,\Omega^3)$ is the zero map, while $H^0(X,\Omega^0)$ and $H^3(X, \Omega ^3)$ are $1$-dimensional.


In order to fulfill these conditions, you can take $Y$ to be Hironaka's example, it is a modification of $CP^3$, so there is a map $p:Y\to CP^3$, and denote by $\omega$ the FS metric on $CP^3$


Then the $X$ mentioned above is the blow up of $Y$ at a point $x$, denote by $\pi:X\to Y$ the blow-up. If $E$ is the exceptional divisor, then $[E]$ is a positive current, and $E^3=-1<0$, and $T$ is $\pi^\*p^\*\omega+\varepsilon S$, where $S$ is some Kahler current on $X$ ans $\varepsilon$ is such that $T^3>0$. Then, as mentiond above, you can find $t>0$ such that $T+t[E]$ has zero self-intersection.


