Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Grøn, Øyvind"'
Anisotropic Generalization of the {\Lambda}CDM Universe Model with Application to the Hubble Tension
Autor:
Grøn, Øyvind G.
Publikováno v:
Symmetry 2024, 16(5), 564
I deduce an exact and analytic Bianchi type I solution of Einsteins field equations, which generalizes the isotropic LambdaCDM universe model to a corresponding model with anisotropic expansion. The main point of the article is to present the anisotr
Externí odkaz:
http://arxiv.org/abs/2406.09479
Autor:
Grøn, Øyvind G.1 (AUTHOR) oyvind.gron.no@gmail.com
Publikováno v:
Axioms (2075-1680). Aug2024, Vol. 13 Issue 8, p526. 10p.
Autor:
Gron, Oyvind, Berntsen, Eirik
A new apparent relativistic paradox is presented involving only one space-time event. This is different from earlier relativistic paradoxes involving extended bodies or events at different positions. A collision between a rod and a ring impacting at
Externí odkaz:
http://arxiv.org/abs/2202.01057
Publikováno v:
JCAP 05 (2018) 044
We study observational viability of Natural Inflation with a tachyon field as inflaton. By obtaining the main perturbation parameters in this model, we perform a numerical analysis on the parameter space of the model and in confrontation with $68\%$
Externí odkaz:
http://arxiv.org/abs/1712.05120
Publikováno v:
Int.J.Mod.Phys. D26 (2017) 1730024
From a hydrodynamicist's point of view the inclusion of viscosity concepts in the macroscopic theory of the cosmic fluid would appear most natural, as an ideal fluid is after all an abstraction (excluding special cases such as superconductivity). Mak
Externí odkaz:
http://arxiv.org/abs/1706.02543
Autor:
Brevik, Iver, Grøn, Øyvind
The research on relativistic universe models with viscous fluids is reviewed. Viscosity may have been of significance during the early inflationary era, and may also be of importance for the late time evolution of the Universe. Bulk viscosity and she
Externí odkaz:
http://arxiv.org/abs/1409.8561
Autor:
Arnfinnsson, Brynjar, Grøn, Øyvind
A new source of the C-metric is described using Israel's formalism. This source is a singular accelerated shell. By construction, perfect inertial dragging is realized inside the shell. The equation of state and energy conditions for the shell are di
Externí odkaz:
http://arxiv.org/abs/1408.4588