Challenges to the Lambda CDM Cosmology
arXiv:2406.12106
Abstract
Observations of the cosmic microwave backgroundradiation are described to remarkable accuracy by the six-parameterLambda CDM cosmology. However, the key ingredients of this model, namely dark matter, dark energy and cosmic inflation are not understood at a fundamental level. It is therefore important to investigate tensions between the CMB and other cosmological probes. I will review aspects of tensions with direct measurements of the Hubble constant H_0, measurements of weak gravitational lensing, and the recent hints of evolving dark energy reported by the Dark Energy Spectroscopic Instrument (DESI) collaboration.
Talk presented at the Royal Society Discussion Meeting 'Challenges to the standard cosmological model', submitted to Phil. Trans Roy. Soc. A. (Typos corrected)