#
Extending the reach of uncertainty quantification in nuclear theory
Doctoral thesis, 2023

## Author

### Isak Svensson

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

### Bayesian estimation of the low-energy constants up to fourth order in the nucleon-nucleon sector of chiral effective field theory

Physical Review C,;Vol. 107(2023)

**Journal article**

### Bayesian parameter estimation in chiral effective field theory using the Hamiltonian Monte Carlo method

Physical Review C,;Vol. 105(2022)

**Journal article**

### Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables

Physical Review C,;Vol. 104(2021)

**Journal article**

### Svensson, I. Ekström, A. Forssén, C. Inference of the low-energy constants in delta-full chiral effective field theory including a correlated truncation error.

In this thesis I push the boundaries of what is currently possible in this regard. The strong nuclear interaction is described in terms of an effective field theory with a relatively large number of parameters, whose values we must infer by matching model predictions to empirical data. I use advanced sampling techniques to quantify probability distributions for these parameters, which I then use to make probabilistic predictions of observables, primarily for collisions between two nucleons. I construct models of the theoretical error in the quantum mechanical calculations and investigate effects on predictions. With the aim of including a wider variety of empirical data in the analysis I use modern emulation techniques, which sacrifice a little accuracy in return for a major computational speedup when computing observables.

### Strong interactions for precision nuclear physics (PrecisionNuclei)

European Commission (EC) (EC/H2020/758027), 2018-02-01 -- 2023-01-31.

### Subject Categories

Subatomic Physics

### Roots

Basic sciences

### ISBN

978-91-7905-823-4

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5289

### Publisher

Chalmers

PJ-salen, Kemigården 1

Opponent: Associate Professor Heiko Hergert, Michigan State University