Abstract
We study slow relaxation in dynamics of liquid water at room temperatures and propose a consistent interpretation explaining why liquid-water dynamics exhibits power law relaxation behavior and can form the bottleneck in phase space even though it is a many-dimensional and strongly chaotic system. Our idea is inspired by recent developments of perturbation theories of Hamiltonian systems, and is reminiscent of the so-called Boltzmann-Jeans conjecture. Within this scenario, it is natural to expect that slow relaxation is not limited to liquid-water dynamics. We found that our hypothesis works well in predicting the relaxation properties of other molecules. The relation to the potential landscape picture is also discussed.