6 papers · 1 filter
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…
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…
Inner structure of dark matter halos at high in cosmological models with non-power-law primordial spectra
M. V. Tkachev, S. V. Pilipenko, E. V. Mikheeva +1
We consider three cosmological models with non-power-law spectra of primordial density perturbations and test them against CDM in density profiles of dark matter halos. We foun…
Observations of Galaxies at Allow to Test Cosmological Models with Features in the Initial Power Spectrum
S. V. Pilipenko, S. A. Drozdov, M. V. Tkachev +1
The initial power spectrum of density perturbations, generated during the inflationary epoch, is now constrained by observations on scales ~Mpc and has a power-law form. The…