3 papers
gr-qc2020
Construction of the cosmological model with periodically distributed inhomogeneities with growing amplitude
Szymon Sikora, Krzysztof Głód
We construct an approximate solution to the cosmological perturbation theory around Einstein-de Sitter background up to the fourth-order perturbations. This could be done with the…
gr-qc2018
Perturbatively constructed cosmological model with periodically distributed dust inhomogeneities
Szymon Sikora, Krzysztof Głód
We constructed a simple cosmological model which approximates the Einstein-de Sitter background with periodically distributed dust inhomogeneities. By taking the metric as a power…
astro-ph.GA2015
Modeling vertical structure in circular velocity of spiral galaxy NGC 4244
Joanna Jałocha, Łukasz Bratek, Szymon Sikora +1
We study the vertical gradient in azimuthal velocity of spiral galaxy NGC 4244 in a thin disk model. With surface density accounting for the rotation curve, we model the gradient p…