About Me

Hi, my name is Julian Durnwalder. I created this website to learn some HTML, CSS and Javascript. It's where you will find projects I have worked on and picture I have taken. Most projects are related to my physics studies at LMU Munich, where I specialised in statistical physics.

In the photography section you will find mostly astrophotography. I am a hobby photographer for almost ten years. My nigth-sky pictures have been featured several times in the Magazine Sterne und Weltraum and the book Astronomy Photographer of the Year: Collection 2.

    

Projects

WormAlgorithmBLBQ

Continuous-Time Quantum Monte Carlo Simulation of the Bilinear-Biquadratic Spin-1 Chain.

This is my master thesis project: A numerical study of Spin-1 models using Quantum Monte Carlo. We employ the Worm Algorithm, one of the many different flavours of Quantum Monte Carlo. This method is based on the path-integral representation of quantum mechanics. The thesis describes the extension of the technique to models with biquadratic interactions. This leads to a so-called sign-problem, which impacts the computational complexity. You can download the thesis or check out the GitHub repository.

Repository

thesis.pdf

The Metropolis Algorithm #SOME2

I am currently working on my entry for Summer of Math Exposition 2. This is still a work in progress. My plan is to make a video on the metropolis algorithm along with an interactive Web App. In the Web App one can play around with different physics simulations based on the metropolis algorithm.

Web App

The Maxima of CY Aquarii

Back in 2013 I created a website to calculte the times of Maxima for the short-period variable star CY Aquarii. To obtain the times of Maxima one needs to perform a heliocentric-time correction.

Website