16 citations · 85 across the 15 of their papers we have counts for
16 papers
The network analysis of the cosmic web as a tool to constrain cosmology and cosmic magnetism
Anton Rudakovskyi, Franco Vazza, Maksym Tsizh
Context. The spatial distribution of haloes in the Cosmic Web encodes a wealth of information about the underlying cosmological model. These haloes can be represented as nodes of a…
Global Signals of the First Molecules from the Dark Ages in the Presence of Primordial Magnetic Fields
Yurii Kulinich, Bohdan Novosyadlyj, Maksym Tsizh +1
We investigate how primordial magnetic fields (PMFs) affect the formation kinetics of the first molecules, H, HD, and HeH, as well as the populations of rovibrational level…
Galaxy Morphological Classification with Manifold Learning
Vasyl Semenov, Vitalii Tymchyshyn, Volodymyr Bezguba +2
We address the problem of morphological classification of galaxies from the Galaxy Zoo DECaLS dataset using classical machine learning techniques. Our approach employs a dimensiona…
On the evolution of Betti curves in the Cosmic web
Vitalii Tymchyshyn, Maksym Tsizh, Franco Vazza +1
In this work, we study the evolution of Betti curves obtained by persistent-homological analysis of point clouds formed by halos in different cosmological -body simulations. We…
Wasserstein distance as a new tool for discriminating cosmologies through the topology of large scale structure
Maksym Tsizh, Vitalii Tymchyshyn, Franco Vazza
In this work we test Wasserstein distance in conjunction with persistent homology, as a tool for discriminating large scale structures of simulated universes with different values…
Samuil Kaplan and the development of astrophysical research at the Lviv University (dedicated to the 100th anniversary of his birth)
Bohdan Novosyadlyj, Bohdan Hnatyk, Yurij Kulinich +6
Samuil Kaplan (1921-1978) was a productive and famous astrophysicist. He was affiliated with a number of scientific centers in different cities of former Soviet Union. The earliest…
Impact of dynamical dark energy on the neutron star equilibrium
S. Smerechynskyi, M. Tsizh, B. Novosyadlyj
We study the density distribution of the minimally-coupled scalar field dark energy inside a neutron star. The dark energy is considered in the hydrodynamical representation as a p…
Solar activity classification based on Mg II spectra: towards classification on compressed data
Sergey Ivanov, Maksym Tsizh, Denis Ullmann +2
Although large volumes of solar data are available for study, the vast majority of these data remain unlabeled and are therefore not amenable to supervised machine learning methods…
Large-scale structures in the CDM Universe: network analysis and machine learning
Maksym Tsizh, Bohdan Novosyadlyj, Yurij Holovatch +1
We perform an analysis of the Cosmic Web as a complex network, which is built on a CDM cosmological simulation. For each of nodes, which are in this case dark matter halos forme…
White dwarfs as a probe of dark energy
Sviatoslav Smerechynskyi, Maksym Tsizh, Bohdan Novosyadlyj
We investigate the radial density distribution of the dynamical dark energy inside the white dwarfs (WDs) and its possible impact on their intrinsic structure. The minimally-couple…
Voids in the Cosmic Web as a probe of dark energy
B. Novosyadlyj, M. Tsizh
The formation of large voids in the Cosmic Web from the initial adiabatic cosmological perturbations of space-time metric, density and velocity of matter is investigated in cosmolo…
Evolution of density and velocity profiles of dark matter and dark energy in spherical voids
Bohdan Novosyadlyj, Maksym Tsizh, Yurij Kulinich
We analyse the evolution of cosmological perturbations which leads to the formation of large isolated voids in the Universe. We assume that initial perturbations are spherical and…
Evolution of density and velocity profiles of matter in large voids
Maksym Tsizh, Bohdan Novosyadlyj
We analyse the evolution of cosmological perturbations which leads to the formation of large voids in the distribution of galaxies. We assume that perturbations are spherical and a…
Dynamics of minimally coupled dark energy in spherical halos of dark matter
Bohdan Novosyadlyj, Maksym Tsizh, Yurij Kulinich
We analyse the evolution of scalar field dark energy in the spherical halos of dark matter at the late stages of formation of gravitationally bound systems in the expanding Univers…
Dynamics of dark energy in collapsing halo of dark matter
M. Tsizh, B. Novosyadlyj
We investigate the non-linear evolution of spherical density and velocity perturbations of dark matter and dark energy in the expanding Universe. For that we have used the conserva…
Gravitational stability of dark energy in galaxies and clusters of galaxies
Bohdan Novosyadlyj, Maksym Tsizh, Yurij Kulinich
We analyze the behavior of the scalar field as dark energy of the Universe in a static world of galaxies and clusters of galaxies. We find the analytical solutions of evolution equ…