Cake Talk by Thomas Cleveland
Recent studies find that measurements of the Hubble constant (H0) determined from the Cosmic Microwave Background are ~9% lower than measurements of H0 from much lower-redshift supernova observations. Several possible modifications to the standard ΛCDM cosmological model have been proposed to explain this discrepancy. A re-analysis of the supernova dataset finds that there are actually two discrepancies: one in H0 but another in the composition of the Universe as well. We show that the models designed to fix this "Hubble Tension" are incapable of correcting each simultaneously. And in a different, simple class of dark energy models, we show these quantities are not only preserved, but meet other observations including Ωmh2. These models predict drastic differences for the future of the Universe than those under ΛCDM—possibly even in the present.