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We study the solutions $u\in C^\infty(R^{2m})$ of the problem $(-\Delta)^m u=Qe^{2mu}$, where $Q=\pm (2m-1)!$, and $V :=\int_{R^{2m}}e^{2mu}dx <\infty$,particularly when $m>1$. This corresponds to finding conformal metrics$g_u:=e^{2u}|dx|^2$ on $R^{2m}$ with constant Q-curvature $Q$ and finite volume$V$. Extending previous works of Chang-Chen, and Wei-Ye, we show that both thevalue $V$ and the asymptotic behavior of $u(x)$ as $|x|\to \infty$ can besimultaneously prescribed, under certain restrictions. When $Q=(2m-1)!$ we needto assume $V<vol(S^{2m})$, but surprisingly for $Q=-(2m-1)!$ the volume $V$ canbe chosen arbitrarily.

Conformal metrics on $R^{2m}$ with constant Q-curvature, prescribed volume and asymptotic behavior