Speaker
Description
The high-precision study of atomic systems can be applied in many practical and theoretical settings, from the development of state-of-the-art atomic and nuclear clocks to fundamental tests of the Standard Model (SM). Tests of the SM, in particular, are typically strongest in heavy and relativistic atomic systems where very weak, parity-violating effects described by the SM or extensions thereof are enhanced. To extract evidence of such weak manifestations of new physics requires a very accurate understanding of how the SM acts insides atoms. Therefore, having methods that accurately model relativistic and many-body effects in such systems is necessary to extract very small deviations from SM physics. Approximation methods that attempt to account for electron interactions at low orders of perturbation theory or in an order-by-order expansion suffer from poor convergence. Many modern atomic structure calculations are therefore carried out with the use of very accurate techniques that sum certain perturbative effects to all orders in perturbation theory. In this talk I will provide an overview of some of the most widely used all-orders methods, and discuss the differences and strengths of each. I will also discuss new results that extend and combine certain aspects of these different methods to include a larger subset of many-body effects.
| I am the presenting author | Yes |
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