# Frontier Quantum Theory (FYS902)

This course explores advanced topics on the analytic and numerical solution of modern quantum field theories.

*Course description for study year 2022-2023*

## Course code

FYS902

## Version

1

## Credits (ECTS)

10

## Semester tution start

Spring, Autumn

## Number of semesters

1

## Exam semester

Spring, Autumn

## Language of instruction

English

## Content

The course consists of two modules chosen each year, depending on the composition of the PhD student body, among the following three:

Module 1 (5ECTS - option1): Advanced Quantum Field Theory

Renormalization and renormalization group Non-Abelian Gauge theory Spontaneous symmetry breaking and the Higgs mechanism Standard model of electroweak and strong interactions Thermal field theory Selected advanced topics (anomalies, topological defects, phase transitions)

Module 2 (5ECTS - option2): Numerical Simulation Methods

Statistical Mechanics and Spin Models Monte-Carlo Methods Deterministic Partial Differential Equations Stochastic Processes and Stochastic PDEs Data Analysis methods

Module 3 (5ECTS - option3): Lattice Field Theory

Statistical Mechanics and Spin Models Renormalization in the Ising Model Scalar Lattice Field Theory Gauge Lattice Field Theory Fermions on the Lattice Real-Time Methods and Challenges Sign-Problem

**Literature:**

**Module 1**: Michael Kachelriess: Quantum Fields, From the Hubble to the Planck Scale, Oxford University Press, 2017

**Module 2**: notes by the lecturer, Kloeden and Platen, Numerical Solution of Stochastic Differential Equations, Springer 1992

**Module 3**: Jan Smit, Introduction to quantum fields on a lattice (Cambridge Lecture Notes in Physics), Cambridge University Press, 2002, Montvay and Munster, Quantum fields on a lattice, Cambridge University Press, 1994

## Learning outcome

The course consists of two modules chosen each year, depending on the composition of the PhD student body. The learning outcome then consists of the corresponding two of the three modules below.

**Module 1 **After having taken this module, the student will be versatile enough to understand the main quantitative properties of a quantum field theory, defined by a given Lagrangian. They will have the skills, among others, to find the ground state of the theory and decide whether it spontaneously breaks some symmetry or not, renormalize the theory and quantify the effects of quantum corrections such as running of the couplings, and map out the phase diagram of the theory.** **

**Module 2: **When the students have finished this course module, we hope that they have achieved the following learning outcomes:** **I feel confident to discuss central concepts of statistical physics using a simple spin model. I easily recall challenges in discretising common deterministic partial differential equations arising in physics. I see no difficulty in explaining the basic properties of stochastic processes and the different challenges they pose for numerical solution; I have a basic theoretical and practical understanding of Monte-Carlo methods to evaluate highly dimensional integrals; I have gained a good understanding of the concepts underlying data analysis and am aware of common pitfalls in the interpretation of simulation data; I feel confident to deploy the numerical simulation tools studied in this course to the study of real-world problems that I encounter in my PhD thesis.

**Module 3 **When the students have finished this course module, we hope that they have achieved the following learning outcomes: I feel confident to discuss central concepts of statistical physics using a simple spin model; I see no difficulty in explaining the basic concepts of lattice regularised field theory using scalar fields as an example; I have a basic understanding of the concept of renormalization and am aware of its application in lattice field theory and spin models; I have gained a first look into the structure and principles underlying lattice gauge theory as well as fermions on the lattice; I feel excited and empowered to study real-world problems that I encounter in my master or PhD thesis work using lattice field theory methods.

## Required prerequisite knowledge

## Recommended prerequisites

## Exam

Form of assessment | Weight | Duration | Marks | Aid |
---|---|---|---|---|

Oral exam/Take-home project | 1/1 | Passed / Not Passed |