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pro vyhledávání: '"Mbonye, Manasse"'
Autor:
Mbonye, Manasse R.
Generating appropriate initial conditions for the Universe is key to discussing cosmic evolution constructively. In standard cosmology the traditional approach assumes an early Universe that emerges from an infinite density, spacetime singularity. It
Externí odkaz:
http://arxiv.org/abs/2404.10799
We investigate cosmological perturbations of f(G) gravity in the presence of a scalar field. Using the 1 + 3 covariant formalism, we present the energy overdensity perturbation equations responsible for large scale structure formation. After applying
Externí odkaz:
http://arxiv.org/abs/2312.15183
The consideration of a 1 + 3 covariant approach to cold dark matter universe with no shear cosmological dust model with irrotational flows is developed in the context of f (G) gravity theory in the present study. This approach reveals the existence o
Externí odkaz:
http://arxiv.org/abs/2305.01331
Autor:
Mbonye, Manasse R.
Publikováno v:
Int. J. Mod. Phys. D 32 12 2350076-786 (2023)
In this paper we discuss a cosmological model for a universe with self-regulating features. We set up the theoretical framework for the model and determine the time evolution of the scale-factor $a(t)$. It is shown that such a universe repeatedly goe
Externí odkaz:
http://arxiv.org/abs/2211.11708
Autor:
Munyeshyaka, Albert, Ntahompagaze, Joseph, Mutabazi, Tom, Mbonye, Manasse. R, Ayirwanda, Abraham, Twagirayezu, Fidele, Abebe, Amare
Publikováno v:
Int. J. Mod. Phys. D 32 12 (2023)
In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the $1 + 3$ covariant formalism in perturbation framework and consider two different models for the inter
Externí odkaz:
http://arxiv.org/abs/2210.01184
This work deals with the computation of the power spectrum of large-scale structure using the dynamical system approach for a multi-fluid universe in scalar-tensor theory of gravity. We use the $1+3$ covariant approach to obtain evolution equations a
Externí odkaz:
http://arxiv.org/abs/2205.12036
In this paper the scalar-tensor theory is applied to the study of perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both scalar and harmonic decompositions are instituted on the perturbation equations. In particular, as an ap
Externí odkaz:
http://arxiv.org/abs/2011.13198
This work discusses scalar-tensor theories of gravity, with a focus on the Brans-Dicke subclass, and one that also takes note of the latter's equivalence with $f(R)$ gravitation theories. A 1+3 covariant formalism is used in this case to discuss cova
Externí odkaz:
http://arxiv.org/abs/1801.01758
Publikováno v:
IJGMMP Vol. 14, No. 7 (2017) 1750107
We study $f(R)$ gravity models in the language of scalar-tensor theories. The correspondence between $f(R)$ gravity and scalar-tensor theories is revisited since $f(R)$ gravity is a subclass of Brans-Dicke models, with a vanishing coupling constant (
Externí odkaz:
http://arxiv.org/abs/1706.07722
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