Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Mutabazi, Tom"'
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:
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
We explore cosmological perturbations in a modified Gauss-Bonnet f(G) gravity, using a 1+3 covariant formalism. In such a formalism, we define gradient variables to get perturbed linear evolution equations. We transform these linear evolution equatio
Externí odkaz:
http://arxiv.org/abs/2103.09597
Autor:
Mutabazi, Tom
We report distance measurements for the Norma cluster based on the near-infrared $J$- and $K_s$-band Fundamental Plane (FP) relations. Our simultaneous $J$ and $K_s$-band photometry analyses were performed using 31 early-type galaxies in the nearby N
Externí odkaz:
http://arxiv.org/abs/2102.12721
Flares and CMEs are very powerful events in which energetic radiation and particles are ejected within a short time. These events thus can strongly affect planets that orbit these stars. This is particularly relevant for planets of M-stars, because t
Externí odkaz:
http://arxiv.org/abs/2010.03336
We present a systematic study of gamma-ray blazar candidates based on a sample of 40 objects taken from the WIBR catalogue. By using a likelihood analysis, 26 of the 40 sources showed significant gamma-ray signatures $\geq3\sigma$. Using high-energy
Externí odkaz:
http://arxiv.org/abs/2004.06476
Blazars are radio-loud Active Galactic Nuclei (AGN) with relativistic jets oriented towards the observer's line-of-sight. Based on their optical spectra, blazars may be classified as flat-spectrum radio quasars (FSRQs) or BL Lacs. FSRQs are more lumi
Externí odkaz:
http://arxiv.org/abs/2004.03154
Publikováno v:
A&A 637, A13 (2020)
Flares and coronal mass ejections (CMEs) are important for the evolution of the atmospheres of planets and their potential habitability, particularly for planets orbiting M stars at a distance < 0.4 AU. Detections of CMEs on these stars have been spa
Externí odkaz:
http://arxiv.org/abs/2003.06163
Autor:
Mutabazi, Tom
The Local Group's peculiar motion with respect to the cosmic microwave background has been measured with high precision and found to be ~627±22 km s-1, but the source of this motion is not clear. Studies to constrain the fractional contribution of t
Externí odkaz:
http://hdl.handle.net/11427/15742