Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Demianski, Marek"'
Publikováno v:
Frontiers in Astronomy and Space Sciences (2020), 7, 69
Several independent cosmological data, collected within the last twenty years, revealed the accelerated expansion rate of the Universe, usually assumed to be driven by the so called dark energy, which, according to recent estimates, provides now abou
Externí odkaz:
http://arxiv.org/abs/2010.05289
Autor:
Demianski, Marek, Piedipalumbo, Ester
In the last dozens of years different data sets revealed the accelerated expansion of the Universe which is driven by the so called dark energy, that now dominates the total amount of matter-energy in the Universe. In a recent paper Glavan, Prokopec
Externí odkaz:
http://arxiv.org/abs/1906.06107
Here we test different models of dark energy beyond the standard cosmological constant scenario. We start considering the CPL parameterization of the equation of state (EOS), then we consider a dark energy scalar field (Quintessense). Finally we cons
Externí odkaz:
http://arxiv.org/abs/1802.01694
Gamma-ray bursts are the most energetic explosions in the Universe. They are detectable up to very high redshifts, therefore can be used to study the expansion rate of the Universe and to investigate the observational properties of dark energy, provi
Externí odkaz:
http://arxiv.org/abs/1610.00854
Context. Explaining the accelerated expansion of the Universe is one of the fundamental challenges in physics today. Cosmography provides information about the evolution of the universe derived from measured distances, assuming only that the space ti
Externí odkaz:
http://arxiv.org/abs/1609.09631
Autor:
Demiański, Marek, Doroshkevich, Andrey
We apply the well known semi analytical model of formation of DM halos to discuss the process of formation and evolution of the relaxed objects dominated by the DM component (such as the first and dSph galaxies and clusters of galaxies). On the one h
Externí odkaz:
http://arxiv.org/abs/1307.7980
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 426, pp. 1396-1415 (2012)
The explanation of the accelerated expansion of the Universe poses one of the most fundamental questions in physics and cosmology today. If the acceleration is driven by some form of dark energy, one can try to constrain the parameters using a cosmog
Externí odkaz:
http://arxiv.org/abs/1206.7046
Autor:
Demianski, Marek, Piedipalumbo, Ester
The correlation between the peak photon energy of the internal spectrum Ep,i and isotropic equivalent radiated energy Eiso (the Amati relation) is explored in a scalar field model of dark energy. Using an updated data set of 109 high redshift GRBs, w
Externí odkaz:
http://arxiv.org/abs/1104.5614
It has been recently empirically established that some of the directly observed pa- rameters of GRBs are correlated with their important intrinsic parameters, like the luminosity or the total radiated energy. These correlations were derived, tested a
Externí odkaz:
http://arxiv.org/abs/1010.0855
Publikováno v:
Gen.Rel.Grav. 37 (2005) 2063-2082
Prompted by the recent more precise determination of the basic cosmological parameters and growing evidence that the matter-energy content of the universe is now dominated by dark energy and dark matter we present the general solution of the equation
Externí odkaz:
http://arxiv.org/abs/gr-qc/0504089