This book focuses on the quantum aspects of cosmology and black holes. The former seeks cosmological entanglement footprints of Euclidean wormholes that nucleate the inflationary universe, and the latter proposes a resolution to the information paradox via the nucleation of Hawking radiation’s entangled partner pairs outside an evaporating black hole. This book begins by reviewing the connection between semi-classical Hawking radiation and the flying mirror analogue gravity model, and later their extensions to experiments and possible black hole evaporation scenarios. With the Euclidean quantum gravity approach, which originally explains the emergence of the universe(s) as something from nothing, this book calls for a something to something interpretation for the release of information to the outside of a black hole. Remarkably, the investigation on entanglement across a Euclidean wormhole in this book is refutable by the observed cosmic microwave background (CMB) power spectrum, and the proposed black hole evaporation scenario also has the potential to be mimicked by the experimentally-testable flying mirror model. This book not only provides alternative insights to resolve long-standing theoretical problems, but also excellent synergy between theories and observations/experiments.

Kuan-Nan Lin is currently a postdoctoral fellow at the Asia Pacific Center for Theoretical Physics (APCTP) in South Korea. He earned his Ph.D. in Physics from the National Taiwan University (NTU) in Taiwan in 2025, where he was also a member of the Leung Center for Cosmology and Particle Astrophysics (LeCosPA), under the mentorship of Prof. Pisin Chen (C.-C. Leung Distinguished Chair Professor of Cosmology at NTU & Founding Director Emeritus of LeCosPA). Dr. Lin’s primary research interests are analogue and quantum gravity. In particular, he not only attempts to resolve some of the long-standing problems in modern theoretical physics such as Why and How the Universe was Born and the Black Hole Information Loss Paradox, but he also tries to synergize theories and observations/experiments with the utilization of analogue gravity models.