Abstract
In this talk I discuss three related topics based on some of the recent developments in hadron and nuclear physics: one, effective field theory approach to two-nucleon systems; two, an explanation of the flavor singlet axial charge in the proton (i.e., "proton spin problem") in terms of a Cheshire Cat phenomenon; and three, the quark-hadron duality in hadronic matter at high density and "qualitons" at high density ("superqualitons"). The principal common theme in these discussions will be the emergence of the generic feature of the Cheshire Cat Principle.
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