Speaker
Prof.
Alexander Zhuk
(Astronomical Observatory Odessa National University (UA), Center for Advanced Systems Understanding (Germany))
Description
We investigate the backreaction of nonlinear perturbations on the global evolution of the Universe within the cosmic screening approach. To this end, we have considered the second-order scalar perturbations. An analytical study of these perturbations followed by a numerical evaluation shows that, first, the corresponding average values have a negligible backreaction effect on the Friedmann equations and, second, the second-order correction to the gravitational potential is much less than the first-order quantity. Consequently, the expansion of perturbations into orders of smallness in the cosmic screening approach is correct. [https://doi.org/10.1016/j.physletb.2023.137797]
Primary author
Prof.
Alexander Zhuk
(Astronomical Observatory Odessa National University (UA), Center for Advanced Systems Understanding (Germany))
Co-authors
Dr
Maxim Eingorn
(North Carolina Central University)
Brianna O'Briant
(North Carolina Central University)
Adjaratou Diouf
(North Carolina Central University)
