3 papers
astro-ph.CO2026
One-point matter PDFs beyond TopHat filters
Anton Chudaykin, Alexander M. Kayssi, Sergey Sibiryakov
We study the one-point probability distribution function (PDF) for matter densities averaged with an arbitrary spherically symmetric window function. The PDF is analytically modele…
astro-ph.HE2025
Picolensing as a Probe of Primordial Black Hole Dark Matter
Michael A. Fedderke, Sergey Sibiryakov
The gravitational-lensing parallax of gamma-ray bursts (GRBs) is an intriguing probe of primordial black hole (PBH) dark matter in the asteroid-mass window, $2\times 10^{-16}M_{\od…
gr-qc2025
Slowly moving black holes in khrono-metric model
Andrew Kovachik, Sergey Sibiryakov
We search for solutions describing slowly moving non-rotating black holes in the khrono-metric model, a modified gravity theory with preferred time (khronon) which arises at low en…