iiinova — where your digital self keeps evolving

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Alex Ji @alexji.bsky.social · 03/09/2026

Nierenberg: If the source is not resolved (e.g. quasars), it causes magnification (at the observed image resolution). Multiple images can give flux ratios, forward model realizations of all the subhalos in foreground. With JWST, constrain m_wdm > 10 keV, M_halo_min < 10^8 Msun #KICPDM

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Alex Ji @alexji.bsky.social · 03/09/2026

Nierenberg: Euclid/LSST/Roman will get 100k's of new galaxy-galaxy lenses! Overall hints of very dense perturbers relative to CDM, interesting to see similar to streams #KICPDM

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Alex Ji @alexji.bsky.social · 03/09/2026

Projections for the future: with 200 lenses in the coming surveys, can reach half mode mass to 10^7 Msun arxiv.org/abs/2604.05237 #KICPDM

arxiv.org

Measurement of the minimum cold dark matter halo mass with strong gravitational lensing

We explore the lowest mass limit that can be placed on the halo mass function in CDM using 28 strong gravitational lenses. For this purpose, we study an extreme model in which the halo mass function a...

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