Exploring the Early Universe with Gravitational Waves

  • Laura Bianca Bethke

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Laura Bianca Bethke
    Pages 1-51
  3. Laura Bianca Bethke
    Pages 53-90
  4. Laura Bianca Bethke
    Pages 133-134
  5. Back Matter
    Pages 135-139

About this book


This work investigates gravitational wave production in the early universe and identifies potentially observable features, thereby paving the way for future gravitational wave experiments. It focuses on gravitational wave production in two scenarios: inflation in a model inspired by loop quantum gravity, and preheating at the end of inflation. In the first part, it is demonstrated that gravitational waves’ spectrum differs from the result obtained using ordinary general relativity, with potentially observable consequences that could yield insights into quantum gravity. In the second part, it is shown that the cosmic gravitational wave background is anisotropic at a level that could be detected by future experiments. Gravitational waves promise to be an rich source of information on the early universe. To them, the universe has been transparent from its earliest moments, so they can give us an unobstructed view of the Big Bang and a means to probe the fundamental laws of nature at very high energies.


Anisotropy of gravitational wave Background Gravitational wave spectrum Gravitational waves in early universe Loop quantum gravity and inflation Massless Preheating Numerical simulations of gravitational waves Quantum cosmology View of Big Bang

Authors and affiliations

  • Laura Bianca Bethke
    • 1
  1. 1.Theoretical Physics Group, Blackett LaboratoryImperial College LondonLondonUnited Kingdom

Bibliographic information