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Explore the current state and emerging challenges of the Lambda Cold Dark Matter (ΛCDM) cosmological model in this physics colloquium by George Efstathiou from the University of Cambridge. Examine how observations of cosmic microwave background (CMB) anisotropies provide strong evidence supporting ΛCDM cosmology while simultaneously revealing troubling tensions within the model. Discover recent CMB results that have strengthened evidence favoring ΛCDM and understand why significant discrepancies exist between the ΛCDM-derived Hubble constant and values obtained from the Cepheid distance scale. Analyze findings from the Dark Energy Spectroscopic Instrument (DESI) and their potential implications for evolving dark energy. Investigate how inflation, despite being a cornerstone of the ΛCDM model, has introduced a new hierarchy problem in modern cosmology, challenging our fundamental understanding of the universe's structure and evolution.
