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Universe, Volume 6, Issue 4

April 2020 - 13 articles

Cover Story: The article explores methods for testing Finsler gravity theories. A satellite with an on-board atomic clock, orbiting in the Finslerian-perturbed gravitational ﬁeld of the earth, is considered, whose time signal is transmitted to a ground station. There its receive time and frequency are measured with respect to another atomic clock; a conﬁguration that is realized by the Galileo 5 and 6 satellites that have gone astray and are now on non-circular orbits. One of the main ﬁndings, obtained by numerical integration of the satellite’s orbit, followed by an iterative procedure which provides the numerically integrated signals from the satellite to the ground station, is that, for sufficiently eccentric orbits, Finslerian effects can be separated from the effects of perturbations of the Schwarzschild spacetime within the Lorentzian geometry. View this paper.

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Article

16 Citations

3,326 Views

20 Pages

Quantum Cosmology of Fab Four John Theory with Conformable Fractional Derivative

Isaac Torres,
Júlio César Fabris,
Oliver Fabio Piattella and
Antônio Brasil Batista

Universe2020, 6(4), 50;https://doi.org/10.3390/universe6040050

31 March 2020

We study a quantization via fractional derivative of a nonminimal derivative coupling cosmological theory, namely, the Fab Four John theory. Its Hamiltonian version presents the issue of fractional powers in the momenta. That problem is solved here b...

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Article

8 Citations

2,749 Views

15 Pages

Model Independent Diagnostics in Interacting Dark Energy Models

Ying Jiang,
Zhongxu Han,
Qian Zhang,
Weiqiang Yang,
Yabo Wu,
Jinyang Li,
Han Lou,
Chenchen Zhao and
Yan Wang

Universe2020, 6(4), 49;https://doi.org/10.3390/universe6040049

30 March 2020

In this paper, we have explored non-gravitational interaction dark energy model between dark energy and cold dark matter (CDM). The main purpose of this work is to explore the deviations from Λ C D M and to distinguish the evolution tr...

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Article

34 Citations

3,336 Views

13 Pages

Stable Wormholes in the Background of an Exponential f(R) Gravity

Ghulam Mustafa,
Ibrar Hussain and
M. Farasat Shamir

Universe2020, 6(4), 48;https://doi.org/10.3390/universe6040048

26 March 2020

The current paper is devoted to investigating wormhole solutions with an exponential gravity model in the background of f ( R ) theory. Spherically symmetric static spacetime geometry is chosen to explore wormhole solutions with anisotropic f...

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Universe - ISSN 2218-1997

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