Статті та доповіді НДІ "АО"

Постійне посилання зібрання

Зараз показуємо 1 - 2 з 2

Effect of peculiar velocities on the gravitational potential in cosmological models with perfect fluids
(2020) Burgazli, Alvina; Shulga, Valerii; Yükselci, A. Emrah; Zhuk, Oleksandr I.; Жук, Олександр Іванович; Жук, Александр Иванович
We consider a universe filled with perfect fluid with the constant equation of state parameter ω. In the theory of scalar perturbations, we study the effect of peculiar velocities on the gravitational potential. For radiation with ω=1/3, we obtain the expression for the gravitational potential in the integral form. Numerical calculation clearly demonstrates the modulation of the gravitational potential by acoustic oscillations due to the presence of peculiar velocities. We also show that peculiar velocities affect the gravitational potential in the case of the frustrated network of cosmic strings with ω=−1/3.
Implementation of gravitational potential screening on large scales in an N-body code
(2019) Baldi, Marco; Burgazli, Alvina; Eingorn, Maxim; Жук, Олександр Іванович; Жук, Александр Иванович; Zhuk, Oleksandr I.
There was considered the Universe filled with cold dark matter in the form of discrete inhomogeneities (e.g., galax-ies) and dark energy in the form of arbitrary continuous per-fect fluids. The background space-time geometry is defined by the Friedmann metric.