Measuring Earth Matter Density and Testing the MSW Theory

In this talk I have raised the question of how the future discovery of leptonic CP violationcan be made robust even at accepting the rather large current experimental uncertainties in our knowledges of neutrino propagation in matter. To make progress toward answering the difficult question, I listed ways to proceed: (1) Obtain tighter constraints on the MSW theory by testing it by various neutrino experiments. (2) Measure the matter effect in situ, namely within the experiment for discovering CP violationitself. (3) Uncover leptonic CP violationin a matter effect free environment. I also reported a step made toward the above point (2) by taking neutrino factoryas a concrete setting; An accurate in situ measurement of the matter effect looks promising.