title: Noncommutative quantum mechanics from noncommutative quantum field theory.
abstract: We derive noncommutative multiparticle quantum mechanics from noncommutative quantum field theory in the nonrelativistic limit. Particles of opposite charges are found to have opposite noncommutativity. As a result, there is no noncommutative correction to the hydrogen atom spectrum at the tree level. We also comment on the obstacles to take noncommutative phenomenology seriously and propose a way to construct noncommutative SU(5) grand unified theory.
authors.affiliation: Department of Physics, National Taiwan University, Taipei, Taiwan, Republic of China. pmho@phys.ntu.edu.tw
authors.forename: Pei-Ming
authors.initials: PM
authors.lastname: Ho
authors.forename: Hsien-Chung
authors.initials: HC
authors.lastname: Kao