The effect of sound speed on the gravitational wave spectrum of first order phase transitions in the early universe

My second master's thesis.

Mika Mäki, 2021-2024, updated in 2025

arXiv version

The updated version of the thesis was published as arXiv:2511.20436 in 2025.

Original version

The original submitted version of the thesis is available in Helda.

Further edited versions

This thesis is a part of PTtools documentation. It may continue to receive minor updates and corrections. You can find the latest version of the PDF in GitHub Actions by clicking the name of the latest workflow run and going to Artifacts → Thesis pdf.

For my first master's thesis, see here, and for my bachelor's thesis, see here.

License notes

The CC BY 4.0 license applies to this repository and the generated PDF files with the following exceptions:

• Third-party figures in the ODP and PDF slides and in the slide folders
• The photo of my face in the ODP and PDF slides
• cft_meetup_presentation_2024/vlcsnap*.png figures
• The figures in fig/lecture_notes are CC-BY-4.0, but by Hindmarsh et al., DOI: 10.21468/SciPostPhysLectNotes.24
• The Python code in msc2_python/giese. This is originally developed by Giese et al., DOI: 10.1088/1475-7516/2021/01/072
• The University of Helsinki LaTeX template files babelbst.tex, englbst.tex, finnbst.tex, swedbst.tex, tktl.bst, UH_TCM_MSc.cls, UH-logo.png