  In this note we show explicitly that, applying an extension of Maldacena's
map for the wavefunction of the Universe $Z[\phi]=\Psi[\phi]$ from de Sitter
inflation to holographic cosmology, we find the relations previously derived
for 2-point functions, $\langle h_{ij}(p) h_{kl}(-p)\rangle \sim 1/[{\rm
Im}\langle T_{ij}(-ip)T_{kl}(+ip)\rangle]$ and a similar one for currents,
which were used to show that holographic cosmology matches CMBR data and solves
Big Bang problems as well as inflation. Higher point functions are done
similarly, and as an application, we check the result for the 3-point functions
of scalar and tensor fluctuations and find the result for the monopole
non-Gaussianity arising from the 3-point functions of currents. The method is
simple and potentially could be applied to calculate any observable in
holographic cosmology.
