Cross correlation of Cosmic Microwave background and Weak Lensing
  The integrated Sachs-Wolfe (ISW) effect and its non-linear extension
Rees-Sciama (RS) effect provide us the information of the time evolution of
gravitational potential. The cross-correlation between the cosmic microwave
background (CMB) and the large scale structure (LSS) is known as a promising
way to extract the ISW (RS) effect. It is known that the RS effect shows the
unique behavior by changing the anti-correlated cross correlation between the
CMB and the mass tracer into the positively correlated cross correlation
compared to the linear ISW effect. We show that the dependence of this flipping
scale of the cross-correlation between RS and weak lensing on dark energy
models. However, there exists the degeneracy between DE and $\Omega_{\rm{m}0}$
which might be broken by redshift dependent observables. The cross-correlation
between the momentum field and the density field might be served as the better
observable to be used for this purpose.
