Atomic Many-Body Theory with Applications

Board Of Regents, Nshe, Obo University Of Nevada, Reno, Reno NV

Investigators

Abstract

The research centers on the development of next-generation high-precision methods of many-body relativistic theory for univalent atoms. A new partial summation scheme to all-orders of many-body perturbation theory will be implemented. This ab initio summation scheme will improve accuracy and convergence of a recently derived and computed 1,648 fourth-order diagram calculation. Second, an incorporation of valence triple and disconnected quadruple excitations into a hierarchy of coupled-cluster equations is proposed. The development of many-body formalisms has a long-term goal of improving accuracy of calculations of atomic parity-violating amplitudes. These amplitudes are important for revealing possible new physics beyond the Standard Model of elementary particles. Applications to the design of ultrastable optical clocks is also discussed.