Save Big on Coursera Plus. 7,000+ courses at $160 off. Limited Time Only! Grab it Explore the fascinating realm of quantum spacetime fluctuations and their impact on gravitational wave observations in this comprehensive lecture. Delve into three key aspects: quantum fluctuations near black hole horizons leading to Hawking emission and Kerr geometry deformation, irreducible noise in gravitational wave detectors caused by spacetime geometry fluctuations, and the potential for a "cosmic glitch" in gravity near the cosmological horizon. Gain insights into the theoretical and observational evidence supporting these phenomena, and understand their significance as manifestations of UV/IR coupling in non-perturbative quantum gravity theories. This in-depth presentation offers a unique perspective on the intersection of quantum mechanics and cosmology, providing valuable knowledge for researchers and enthusiasts in the field of gravitational physics.