With time, a longstanding tension between the cosmic expansion rate inferred from maps of the large-scale distribution of mass and that obtained from direct measurements has become more significant and less easily attributed to problems with the analyses. I will review this Hubble tension and discuss ideas for new physics that it has spawned.
College of Liberal Arts & Sciences
2090 Lincoln Hall
702 S. Wright St., MC-448
Urbana, IL 61801
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