# Fuzzy dark matter and the H_0 gravitational lensing measurement

### APA

Teodori, L. (2024). Fuzzy dark matter and the H_0 gravitational lensing measurement. Perimeter Institute. https://pirsa.org/24020065

### MLA

Teodori, Luca. Fuzzy dark matter and the H_0 gravitational lensing measurement. Perimeter Institute, Feb. 13, 2024, https://pirsa.org/24020065

### BibTex

@misc{ pirsa_PIRSA:24020065, doi = {10.48660/24020065}, url = {https://pirsa.org/24020065}, author = {Teodori, Luca}, keywords = {Particle Physics}, language = {en}, title = {Fuzzy dark matter and the H_0 gravitational lensing measurement}, publisher = {Perimeter Institute}, year = {2024}, month = {feb}, note = {PIRSA:24020065 see, \url{https://pirsa.org}} }

Luca Teodori Weizmann Institute of Science

## Abstract

Fuzzy dark matter can form cored density distributions, named solitons, at the center of galaxies. Such cores can be viewed as approximate mass sheets and can affect the time delay cosmography Hubble constant (H_0) measurement via the mass sheet degeneracy. We show that a subdominant component of fuzzy dark matter can yield a 10 percent shift in the inferred H_0, if the particle mass is of order 10^-25 eV. The sensitivity of time delays on such cores (difficult to spot otherwise) may give a further probe in constraining the fuzzy dark matter scenario, if an H_0 prior is assumed.

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