5 papers
Do Primordial Black Hole Clusters Survive the Galaxy? Collisional Disruption and Microlensing Implications
M. V. Tkachev, S. V. Pilipenko
We study the collisional disruption of primordial black hole (PBH) clusters in the Milky Way halo. Encounters between clusters strip PBHs into a diffuse component, and the fraction…
Origin of monolithic high-z galaxies and UV luminosity of mergering high-z galaxies in the cosmological model with non-standard spectrum of density perturbations
Yu. N. Eroshenko, V. N. Lukash, E. V. Mikheeva +2
The James Webb Space Telescope (JWST) has detected an unexpectedly large number of galaxies at redshifts compared to the predictions of the standard CDM model. One o…
Constraints on Features in the Cosmological Power Spectrum from Observations of the Epoch of Reionization
O. R. Skorikov, S. V. Pilipenko, M. V. Tkachev
We consider cosmological models with a power spectrum of perturbations featuring an enhanced amplitude on dwarf galaxy scales (with a "bump" or a "tilt"). Early formation of a larg…
High- SMBHs in Cosmological Models with Enhanced Power Spectra
M. V. Tkachev, S. V. Pilipenko, E. V. Mikheeva +1
We consider the impact of non-power-law spectra of matter perturbations with a bump or with a blue tilt at small scales on the evolution of supermassive black holes (SMBHs) located…
On the increase in the concentration of primordial black holes in the halos of dwarf galaxies
S. V. Pilipenko, M. V. Tkachev, N. R. Arakelyan
Through numerical experiments, we have predicted that if dark matter (DM) contains even a small fraction, , of primordial black holes (PBHs), during the formation o…