Title: Exponentially small splitting of separatrices near a period-doubling bifurcation in area-preserving maps,
Abstract: We consider the conservative Hénon family at the period-doubling
bifurcation of its fixed point and demonstrate that the separatrices of the
fixed saddle point nearing the bifurcation split exponentially: given that
$\lambda_+$ is the smaller of the eigenvalues of the saddle point, the angle
between the separatrices along the homoclinic orbit satisfies $$\sin \alpha =
O(e^{-{\pi^2 \over \log |\lambda_+|}})+ O\left( e^{-2 (1-\kappa) {\pi^2 \over
\log |\lambda_+|}} \right),$$ for any positive $\kappa<1$.