Exploring the Early Universe with Gravitational Waves

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Focusing on gravitational wave production in the early universe, this work examines two key scenarios: inflation influenced by loop quantum gravity and preheating post-inflation. It reveals that the spectrum of gravitational waves differs from predictions based on ordinary general relativity, offering insights into quantum gravity. Additionally, it highlights that the cosmic gravitational wave background exhibits detectable anisotropy, suggesting that these waves could provide valuable information about the Big Bang and the fundamental laws of nature at extreme energies.