EAN: 9783319174488

EXPLORING THE EARLY UNIVERSE WITH GRAVITATIONAL...

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.

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