Theoretical subatomic physics
||Theoretical subatomic physics|
||SNIC Medium Storage|
||Christian Forssén <email@example.com>|
||Chalmers tekniska högskola|
||2020-07-01 – 2021-07-01|
Through the research contained in this proposal we want to make significant advances in the theoretical modeling of atomic nuclei. In particular, we will study chiral effective field theory as a tool to understand the nature of the strong nuclear force. Within this theoretical framework, the strong force between nucleons can be systematically derived in a power counting scheme as a series of pion-exchanges and contact interactions, with the well-known one-pion exchange at the leading order. In the past decade very precise models of the strong force resulted from this procedure by going to next-to-next-to-next-to-leading order, and atomic nuclei have indeed been computed from scratch based on this approach. In these models, three-nucleon forces play a smaller but pivotal role.
The computational problem corresponds to:
- very fast computation of nuclear scattering observables (many small MatMat operations).
- many-parameter optimization (up to 40 parameters)
- large-scale matrix diagonalization (to solve the quantum mechanical many-body problem with strong interactions). Sparse MatVec and large VecVec operations.