Quantum Chromodynamics (QCD) has rich contents under various
extreme environments. I will discuss recent developments of
hot and dense QCD I have been involved in; a complicated
phase structure of color superconductivity at high baryon
density, an effective description by the idea of the Color
Glass Condensate at high gluon density, and its application
to the very initial stage of heavy-ion collisions. I will
present some ongoing works and address a way to go from my
point of view.
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