The cards below are refreshed weekly from my NASA ADS library, with a representative figure extracted from each paper and a short plain-language summary of its abstract. For the complete publication record see my ADS library or my ORCID profile.
Correlation between Baryonic Process and Galaxy Assembly Bias
For galaxies picked by their mass in stars, the extra clustering that depends on more than the mass of their dark matter halos tracks most closely how gas cools and how stars blow gas back out, regardless of how common the galaxies are. For galaxies picked by how fast they form stars, the most closely linked process shifts from star formation itself to gas cooling as the sample includes more common galaxies.
Free-Streaming Length of Dark Matter from JWST Observations of 28 Strong Gravitational Lenses
The pattern of distortions in 28 quadruply imaged quasars observed by JWST shows that dark matter still clumps on scales below about 10^7 solar masses, limiting the distance its particles stream before structure forms to under 6 to 7 kpc and requiring a thermal relic particle heavier than about 7 keV. Assuming dark matter is cold instead, the mass held in small clumps around elliptical lens galaxies is measured directly, confirming a central prediction of the standard picture.
Warm, Not Fuzzy: Generalized Ultralight Dark Matter Limits from Milky Way Satellites
Ultralight dark matter produced with structure on small scales behaves less like the "fuzzy" dark matter usually assumed and more like warm dark matter, with an additional wave-interference effect that adds small-scale structure back in. Matching this against the observed population of Milky Way satellite galaxies sets a new lower limit on the particle mass that depends on the scale at which the field's structure peaks.
Testing Warm Dark Matter with Kinematics of the Smallest Galaxies
Every dark matter halo forms with a dense spike at its center, and if dark matter is "warm" enough to erase small-scale structure those spikes are heavy enough to speed up the stars in the smallest galaxies — yet the stars in Tucana V and Triangulum II move far too slowly to match. Taken together, the three faintest Milky Way satellites rule out dark matter particles lighter than 5.8 keV at 95% confidence, a limit that better velocity measurements or the discovery of more such galaxies could sharpen considerably.
JWST lensed quasar dark matter survey. III. Dark matter sensitive flux ratios and warm dark matter constraint from the full sample
Infrared images of the warm dust around 31 multiply imaged quasars, taken with JWST, double the sensitivity to a cutoff in the number of low-mass dark matter clumps relative to earlier work, and show no sign of one down to about 10^7.8 solar masses. That implies dark matter particles produced thermally in the early universe must be heavier than roughly 6 keV.