Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Kurek, Aleksandra"'
Publikováno v:
JCAP 1007:004,2010
In this paper we study possible observational consequences of the bouncing cosmology. We consider a model where a phase of inflation is preceded by a cosmic bounce. While we consider in this paper only that the bounce is due to loop quantum gravity,
Externí odkaz:
http://arxiv.org/abs/1005.0814
Publikováno v:
Phys.Rev.D81:063515,2010
We present the Bayesian analysis of four different types of backreation models, which are based on the Buchert equations. In this approach, one considers a solution to the Einstein equations for a general matter distribution and then an average of va
Externí odkaz:
http://arxiv.org/abs/0811.4487
Publikováno v:
Phys.Lett.B690:337-345,2010
We develop here a relatively simple description of dark energy based on the dynamics of non-minimally coupled to gravity phantom scalar field which, in limit, corresponds to cosmological constant. The dark energy equation of state, obtained directly
Externí odkaz:
http://arxiv.org/abs/0805.4005
Publikováno v:
Eur. Phys. J. C75, 5 (2015)
Recent astronomical observations have indicated that the Universe is in the phase of accelerated expansion. While there are many cosmological models which try to explain this phenomenon, we focus on the interacting $\Lambda$CDM model where the intera
Externí odkaz:
http://arxiv.org/abs/0801.0638
Autor:
Szydlowski, Marek, Kurek, Aleksandra
Publikováno v:
EAS Publications Series, 30 (2008) 169-174
We develop a simple method of dark energy reconstruction using a geometrical form of the luminosity-distance relation. In this method the FRW dynamical system with dark energy is reconstructed instead of the equation of state parameter. We give sever
Externí odkaz:
http://arxiv.org/abs/0711.0359
Autor:
Kurek, Aleksandra, Szydlowski, Marek
Publikováno v:
Nuovo Cim.B122:1359-1364,2007
Recent astronomical observations of SNIa, CMB, as well as BAO in the Sloan Digital Sky Survey, suggest that the current Universe has entered a stage of an accelerated expansion with the transition redshift at $z \simeq 0.5$. While the simplest candid
Externí odkaz:
http://arxiv.org/abs/0710.2125
Publikováno v:
Phys.Rev.D77:027302,2008
In the paper we investigate observational constraints on coupling to gravity constant parameter $\xi$ using distant supernovae SNIa data, baryon oscillation peak (BOP), the cosmic microwave background radiation (CMBR) shift parameter, and $H(z)$ data
Externí odkaz:
http://arxiv.org/abs/0710.0366
Publikováno v:
Phys.Lett.B659:14-25,2008
The oscillating scenario of route to Lambda was recently proposed by us arXiv:0704.1651 as an alternative to a cosmological constant in a explanation of the current accelerating universe. In this scenario phantom scalar field conformally coupled to g
Externí odkaz:
http://arxiv.org/abs/0707.0292
Autor:
Kurek, Aleksandra, Szydłowski, Marek
Publikováno v:
Astrophys.J.675:1-7,2008
Recent astronomical observations indicate that our Universe is undergoing a period of an accelerated expansion. While there are many cosmological models, which explain this phenomenon, the main question remains which is the best one in the light of a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702484
Autor:
Szydlowski, Marek, Kurek, Aleksandra
Publikováno v:
ECONFC0602061:18,2006; Int.J.Geom.Meth.Mod.Phys.4:313,2007
We characterize a class of simple FRW models filled by both dark energy and dark matter in notion of a single potential function of the scale factor $a(t)$; $t$ is the cosmological time. It is representing potential of fictitious particle - Universe
Externí odkaz:
http://arxiv.org/abs/gr-qc/0608098