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Explore the fundamental limitations of the standard ΛCDM cosmological model and discover alternative theoretical frameworks in this comprehensive lecture from the Galileo Galilei Institute. Delve into the observational tensions and theoretical challenges that motivate cosmologists to look beyond the conventional Lambda Cold Dark Matter paradigm, examining how recent astronomical observations have revealed discrepancies that cannot be easily reconciled within the standard model. Learn about the Hubble tension, the σ8 tension, and other observational anomalies that suggest our understanding of cosmic evolution may be incomplete. Investigate alternative cosmological models including modified gravity theories, dark energy models beyond the cosmological constant, and early universe modifications that could potentially resolve these tensions. Understand the theoretical foundations and observational predictions of these alternative frameworks, and examine how they might reshape our understanding of cosmic structure formation, the expansion history of the universe, and the fundamental nature of dark matter and dark energy. Gain insights into the current state of cosmological research and the ongoing efforts to develop more comprehensive models that can account for all available observational data while maintaining theoretical consistency.
