7 papers
Globular cluster distributions as a dynamical probe of dark matter
Nativ Ben-Yeda, Kfir Blum, Inbar Havilio
Globular clusters (GCs) act as massive probe particles traversing the dark matter halos of their host galaxies. Gravitational dynamical friction due to halo particles causes GC orb…
The O(4)-breaking bubble
Guy Avraham, Kfir Blum, Omri Rosner +1
False vacuum decay in field theory is thought to be dominated by Coleman's O(4)-symmetric bounce, the minimum action nontrivial solution of the imaginary time equations of motion.…
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…
Corrections to the Smoothness and On-Shell Approximations in Femtoscopy and Coalescence
Isaac G. Smith, Kfir Blum
Relativistic heavy-ion collisions produce femtometer-scale sources whose space-time structure can be constrained using two-particle femtoscopic correlations. Standard implementatio…
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…