Quantum fluctuations play a significant role in shaping cosmic structures by generating non-Gaussian, exponential tails in the distribution of inflationary perturbations. These fluctuations influence the formation of collapsed structures, including primordial black holes, and have implications for large-scale structures in the universe. Notably, they increase the likelihood of heavy clusters, such as "El Gordo," and large voids associated with cosmic microwave background anomalies. Research indicates that these effects are critical for understanding the evolution of the universe's structure. Overall, quantum fluctuations are essential in the formation and distribution of cosmic structures on large scales.
