6 papers
Gravitational lensing time delay beyond the Shapiro/geometry split
Luca Teodori, Kfir Blum, Zhaoyu Bai
Time delays are a key observable in strong gravitational lensing systems. Their theoretical expression is usually written as a sum of a geometrical delay and a Shapiro delay, with…
Influence of tides and self-gravity on Ultra-Light Dark Matter Bounds from Dwarf Galaxies
Andrea Caputo, Luca Teodori
Dwarf spheroidal galaxies provide some of the most sensitive astrophysical probes of ultra-light dark matter (ULDM), but the inferred constraints can be affected by two important s…
The approximate gravitational lensing multiple plane mass sheet degeneracy
Luca Teodori
Strong gravitational lensing has to deal with many modeling degeneracies, the most notable being the Mass Sheet Degeneracy (MSD). We review the MSD when one needs to model more len…
Ultra-Light Dark Matter Simulations and Stellar Dynamics: Tension in Dwarf Galaxies for eV
Luca Teodori, Andrea Caputo, Kfir Blum
We present numerical simulations of dark matter and stellar dynamics in ultra light dark matter halos tailored to mimic dwarf galaxies. An important effect we observe is the dynami…
Bracketing the soliton-halo relation of ultralight dark matter
Kfir Blum, Marco Gorghetto, Edward Hardy +1
In theories of ultralight dark matter, solitons form in the inner regions of galactic halos. The observational implications of these depend on the soliton mass. Various relations b…
AxionH0graphy: hunting for ultralight dark matter with cosmographic H signal
Kfir Blum, Luca Teodori
If ultralight boson fields exist, then vacuum misalignment populates them with nonzero relic abundance. For a broad range of particle mass the field condenses into fuzzy cores…