Zobrazeno 1 - 10
of 3 677
pro vyhledávání: '"Pereira, S. A."'
In this paper we study the effects of torsion of space-time in the expansion of the universe as a candidate to dark energy. The analysis is done by reconstructing the torsion function along cosmic evolution by using observational data of Supernovae t
Externí odkaz:
http://arxiv.org/abs/2402.00844
In the present work, we apply consistency relation tests to several cosmological models, including the flat and non-flat $\Lambda$CDM models, as well as the flat XCDM model. The analysis uses a non-parametric Gaussian Processes method to reconstruct
Externí odkaz:
http://arxiv.org/abs/2311.10703
Publikováno v:
Phys. Rev. D 109, 023514 (2024)
The possibility of an expanding decelerating Universe in the distant future is investigated in the context of a quintessence scalar field cosmology. Such a conceivable evolution is tested against SNe Ia and $H(z)$ cosmic chronometers data, and also t
Externí odkaz:
http://arxiv.org/abs/2302.01946
Publikováno v:
MNRAS 528, 1573 (2024)
By using recent $H(z)$ and SNe Ia data, we reconstruct the evolution of kinematic parameters $H(z)$, $q(z)$, jerk and snap, using a model-independent, non-parametric method, namely, the Gaussian Processes. Throughout the present analysis, we have all
Externí odkaz:
http://arxiv.org/abs/2212.12346
Variability Matters : Evaluating inter-rater variability in histopathology for robust cell detection
Large annotated datasets have been a key component in the success of deep learning. However, annotating medical images is challenging as it requires expertise and a large budget. In particular, annotating different types of cells in histopathology su
Externí odkaz:
http://arxiv.org/abs/2210.05175
Publikováno v:
Journal of High Energy Physics 2022
The mass dimension one (MDO) fermionic field is built on a complete set of dual-helicity eigenspinors of the charge conjugation operator, which obeys the statistic of Fermi-Dirac. These spinors are a potential candidate for the description of dark ma
Externí odkaz:
http://arxiv.org/abs/2206.13941
Publikováno v:
MNRAS 515, 5981-5992 (2022)
The Co-varying Physical Couplings (CPC) framework is a modified gravity set up assuming Einstein Field Equations wherein the quantities $\{G,c,\Lambda\}$ are promoted to space-time functions. Bianchi identity and the requirement of stress-energy tens
Externí odkaz:
http://arxiv.org/abs/2204.10764
Publikováno v:
Eur. Phys. J. C 82, 821 (2022)
We study a cosmological model with a fermionic field which can be interpreted as a source of dark energy in the universe. Two different approaches were considered, the first one with a massless fermionic field represented by a standard wave-function
Externí odkaz:
http://arxiv.org/abs/2203.04127
Publikováno v:
Eur. Phys. J. C 82, 356 (2022)
A cosmological model in an Einstein-Cartan framework endowed with torsion is studied. For a torsion function assumed to be proportional to Hubble expansion function, namely $\phi=-\alpha H$, the contribution of torsion function as a dark matter compo
Externí odkaz:
http://arxiv.org/abs/2202.01807
Publikováno v:
MNRAS 519, 633-640 (2023)
A minimal model based on the Co-varying Physical Couplings (CPC) framework for gravity is proposed. The CPC framework is based on the assumptions of a metric-compatible four-dimensional Riemannian manifold where a covariantly conserved stress-energy
Externí odkaz:
http://arxiv.org/abs/2202.01371