# The cosmology of electron scalars

### APA

Weiner, Z. (2023). The cosmology of electron scalars. Perimeter Institute. https://pirsa.org/23110081

### MLA

Weiner, Zach. The cosmology of electron scalars. Perimeter Institute, Nov. 28, 2023, https://pirsa.org/23110081

### BibTex

@misc{ pirsa_PIRSA:23110081, doi = {10.48660/23110081}, url = {https://pirsa.org/23110081}, author = {Weiner, Zach}, keywords = {Particle Physics}, language = {en}, title = {The cosmology of electron scalars}, publisher = {Perimeter Institute}, year = {2023}, month = {nov}, note = {PIRSA:23110081 see, \url{https://pirsa.org}} }

**Collection**

**Subject**

The cosmic microwave background is a sensitive probe of early-Universe physics, and yet fundamental constants at recombination can differ from their present-day values due to degeneracies in the standard cosmological model. Such scenarios have been invoked to reconcile discrepant measurements of the present-day expansion rate, but even absent such motivation they raise the intriguing possibility of yet-undiscovered physics coupled directly to Standard Model particles. I will discuss theories in which a new scalar field shifts the electron's mass at early times; viable models are already stringently constrained by measurements of quasar absorption lines, the abundances of light elements, and the universality of free fall. I will show that the remaining parameter space is exactly that which allows not only the primary cosmic microwave background but also low-redshift distances to be consistent with observations. After presenting the results of parameter inference I will discuss additional cosmological and laboratory signatures of the model.

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