Birational geometry of nonrational rationally connected varieties

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Q-Fano varieties appear as one of the final outcomes of the (log) minimal model program and they are important objects in the classification theory of algebraic varieties. We studied the birational unboundedness of higher-dimensional Q-Fano varieties. The birational unboundedness means that varieties in concern form infinitely many families even if we identify varieties which are birational to each other. We have proved the birational unboundedness of Q-Fano varieties in each dimension at least 3. We further proved a similar result for rationally connected Mori fiber spaces.