71 citations · 351 across the 26 of their papers we have counts for
5 papers · 1 filter
Transition redshift from the V-reconstruction method
Wojciech Czaja, Marek Szydlowski, Adam Krawiec
We show the effectiveness of using the procedure of the potential reconstruction (the V-method) in the estimation of the transition redshift corresponding to switch from decelerati…
Modified Friedmann Cosmologies - theory & observations
Marek Szydlowski, Wojciech Czaja
We investigate a class of Cardassian scenarios of the universe evolution in notions of the qualitative theory of dynamical systems. This theory allows us to analyze all solutions f…
Phantom cosmology as a simple model with dynamical complexity
Marek Szydlowski, Adam Krawiec, Wojciech Czaja
We study the Friedmann-Robertson-Walker model with phantom fields modelled in terms of scalar fields. We apply the Ziglin theory of integrability and find that the flat model is no…
Toward reconstruction of dynamics of the Universe from distant supernovae type Ia
Marek Szydlowski, Wojciech Czaja
We demonstrate a model-independent method of estimating qualitative dynamics of an accelerating universe from observations of distant type Ia supernovae. Our method is based on the…
Stability of FRW Cosmology with Generalized Chaplygin Gas
Marek Szydlowski, Wojciech Czaja
We apply methods of dynamical systems to study the behaviour of universe dominated by the generalized Chaplygin gas. We reduce the dynamics to a 2-dimensional Hamiltonian system an…