Oral comunication
A. R. Liddle
Abstract
Despite the considerable successes of the standard LambdaCDM cosmology, the topic has recently been plagued by marginally-significant signs of deviations from this paradigm. Notable amongst these are the 5-sigma Hubble tension and the 3 to 4-sigma hints of evolving dark energy density identified by the DESI collaboration. I review both the LambdaCDM successes and these discrepancies, focussing in particular on the unexpected nature of the cosmologies that they point towards and on what this means for secure cosmological inference. [Based on work carried out in collaboration with Marina Cortês.]
ENAA XXXV
Lisboa, Portugal
2025 September
