Outline Introduction to quantum many-body approaches and the unsettled Renormalization, vacuum, dark energy? Real puzzle of symmetry energy or mal-definition Symmetry energy and quarks hyperons In neutron stars. effect of dark matter? Concluding remarks May 9, 2013@ USTCMay 9, 2013 @ USTC ➢ Introduction to quantum many-body approaches and the unsettled ➢ Renormalization, vacuum, dark energy? ➢ Real puzzle of symmetry energy or mal-definition? ➢ Symmetry energy and quarks & hyperons ➢ In neutron stars, effect of dark matter? ➢ Concluding remarks Outline