191 citations · 228 across the 10 of their papers we have counts for
7 papers · 1 filter
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…
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…
Host group degeneracy in gravitational lensing time delay determination of
Luca Teodori, Kfir Blum
Massive elliptical galaxies, that serve as lenses in gravitational lensing time delay measurements of the Hubble parameter , often reside in a host group. We consider degenera…
Comments on the mass sheet degeneracy in cosmography analyses
Luca Teodori, Kfir Blum, Emanuele Castorina +2
We make a number of comments regarding modeling degeneracies in strong lensing measurements of the Hubble parameter . The first point concerns the impact of weak lensing assoc…
lenstronomy II: A gravitational lensing software ecosystem
Simon Birrer, Anowar J. Shajib, Daniel Gilman +18
lenstronomy is an Astropy-affiliated Python package for gravitational lensing simulations and analyses. lenstronomy was introduced by Birrer and Amara (2018) and is based on the li…
Gravitational lensing tension from ultralight axion galactic cores
Kfir Blum, Luca Teodori
Gravitational lensing time delays offer an avenue to measure the Hubble parameter , with some analyses suggesting a tension with early-type probes of . The lensing measur…