Published October 1, 2020
| Version v1
Presentation
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The Theoretical Perspective
Description
I review how H0 is derived from CMB data in the LCDM model and the state of the art in attempts to find resolutions of the H0 problem via departures from LCDM. I place particular emphasis on the challenges that theorists face in this endeavor and underscore the impressive successes of LCDM.