Zobrazeno 1 - 10
of 274
pro vyhledávání: '"Szydlowski, Marek"'
Autor:
Szydlowski, Marek, Krawiec, Adam
The cosmological observations suggest that the presently accelerating universe should be filled by an exotic form of matter, violating the strong energy condition, of unknown nature and origin. We propose the viscous dark matter of a source of accele
Externí odkaz:
http://arxiv.org/abs/2006.14900
We consider the model of economic growth with time delayed investment function. Assuming the investment is time distributed we can use the linear chain trick technique to transform delay differential equation system to equivalent system of ordinary d
Externí odkaz:
http://arxiv.org/abs/2002.05016
Autor:
Humieja, Franciszek, Szydlowski, Marek
Publikováno v:
Eur. Phys. J. C79, 794 (2019)
We have used the dynamical system approach in order to investigate the dynamics of cosmological models of the flat Universe with a non-minimally coupled canonical and phantom scalar field and the Ratra-Peebles potential. Applying methods of the bifur
Externí odkaz:
http://arxiv.org/abs/1901.06578
We investigate a cosmological model in which dark energy identified with the vacuum energy which is running and decaying. In this model vacuum is metastable and decays into a bare (true) vacuum. This decaying process has a quantum nature and is descr
Externí odkaz:
http://arxiv.org/abs/1812.00616
Publikováno v:
Advances in High Energy Physics 2018, 7080232 (2018)
We consider a cosmology with decaying metastable dark energy and assume that a decay process of this metastable dark energy is a quantum decay process. Such an assumption implies among others that the evolution of the Universe is irreversible and vio
Externí odkaz:
http://arxiv.org/abs/1804.03113
Publikováno v:
Phys. Rev. D 97, 103524 (2018)
We investigate cosmological dynamics based on $f(R)$ gravity in the Palatini formulation. In this study we use the dynamical system methods. We show that the evolution of the Friedmann equation reduces to the form of the piece-wise smooth dynamical s
Externí odkaz:
http://arxiv.org/abs/1712.00822
Publikováno v:
Eur. Phys. J. C78, 249 (2018)
In the framework of polynomial Palatini cosmology, we investigate a simple cosmological homogeneous and isotropic model with matter in the Einstein frame. We show that in this model during cosmic evolution, it appears the early inflation and the acce
Externí odkaz:
http://arxiv.org/abs/1708.04823
We investigate the dynamical complexity of Cournot oligopoly dynamics of three firms by using the qualitative methods of dynamical systems to study the phase structure of this model. The phase space is organized with one-dimensional and two-dimension
Externí odkaz:
http://arxiv.org/abs/1708.02193
Publikováno v:
Eur. Phys. J. C77, 603 (2017)
We consider FRW cosmology in $f(R)= R+ \gamma R^2+\delta R^3$ modified framework. The Palatini approach reduces its dynamics to the simple generalization of Friedmann equation. Thus we study the dynamics in two-dimensional phase space with some detai
Externí odkaz:
http://arxiv.org/abs/1707.01948
Publikováno v:
Eur. Phys. J. C78, 552 (2018)
In this paper, we apply a method of reducing the dynamics of FRW cosmological models with the barotropic form of the equation of state to the dynamical system of the Newtonian type to detect the finite scale factor singularities and the finite-time s
Externí odkaz:
http://arxiv.org/abs/1706.02354