Speaker
Description
I will discuss the evidence for beyond-ΛCDM physics arising from the combination of different cosmological probes including DESI BAO, primary CMB and CMB lensing. I will review the information that can be extracted from the different probes. The tension between the parameters, particularly the matter fraction, inferred from individually fitting ΛCDM to each probes hints at the potential for new physics. However, I will show that although evolving dark energy is the only model found to fit the data when supernovae observations are included, several model extensions provide viable fits when these contested observations are excluded. Furthermore, it was recently pointed out that within the ΛCDM model a systematic error in the optical depth inferred from the primary CMB is also able to explain the observed discrepancies. Finally, I will look towards future avenues for untangling the complex picture arising from the combination of different probes and making headway in constraining a consistent cosmological model.