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TH BSM Forum
Light Hidden Sectors and the Hubble Tension
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Europe/Zurich
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CERN
Description
The inference of the present expansion rate from the
Cosmic Microwave Background and other early-time probes (assuming standard
cosmology) is in significant tension with
several direct measurements of the same quantity. If this discrepancy is not
due to unresolved systematics, it could provide strong evidence for physics
beyond the standard models of particle physics and cosmology. I will describe a few simple models that
attempt to alleviate this Hubble tension. All of these scenarios contain
additional energy density of new light particles at early times with
interactions that modify the background cosmology and evolution of density
perturbations in the early universe. First, I will motivate the existence of a
decaying component of dark matter with a significant free-streaming length as a
means of addressing this tension. Then I will consider models with
self-interacting neutrino or dark radiation components. I will show that such
scenarios face stringent cosmological and laboratory constraints. As a result, in these
examples, the tension can be alleviated but not eliminated altogether.
Zoom coordinates below:
https://cern.zoom.us/j/99113688676
Meeting ID: 991 1368 8676
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Meeting ID: 991 1368 8676
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Meeting ID: 991 1368 8676
