# Bachelor thesis in Physics

My thesis on **Gravitational Waves in Modified Gravity** I wrote **in 2015** at **Heidelberg University**.

From README.md in the nilsleiffischer/bsc-thesis GitHub repository:

# Bachelor thesis in Physics

**Title:**Gravitational Waves in Modified Gravity**Author:**Nils Leif Fischer**Submission date:**Jul 22, 2015**Supervisors:**Dr. Valeria Pettorino and Prof. Dr. Luca Amendola**Institution:**Institute for Theoretical Physics, Department of Physics and Astronomy, University of Heidelberg**Abstract:**Modified gravity theories generally aim to solve part of the*cosmological constant problem*by providing self-accelerating cosmological solutions without a cosmological constant. Such modifications of general relativity also affect the evolution of gravitational waves in the proposed theory. Instead of focussing on an explicit model, I introduce parametric modifications to the evolution equation of gravitational waves in both unimetric and bimetric settings and investigate their effect on the evolution of tensor perturbation modes. In particular, I argue that any modified gravity theory that exhibits*growing tensor modes*in cosmological evolution can be in tension with experiments. Therefore, parametric constraints for the physical viability of a general modified gravity theory can be found such that tensor modes remain within limits set by observations.**Full Text:**Digital version

## Using the LaTeX style for your thesis

- Please refer to my master thesis for an updated LaTeX style.