Zobrazeno 1 - 10
of 6 827
pro vyhledávání: '"Rafael, C."'
Rigid (Uniform) rotation is usually assumed when investigating the properties of mature neutron stars (NSs). Although it simplifies their description, it is an assumption because we cannot observe the NS's innermost parts. Here, we analyze the struct
Externí odkaz:
http://arxiv.org/abs/2410.13793
Autor:
Pinto, Rafael C., Tavares, Anderson R.
This paper demonstrates that a single-layer neural network using Parametric Rectified Linear Unit (PReLU) activation can solve the XOR problem, a simple fact that has been overlooked so far. We compare this solution to the multi-layer perceptron (MLP
Externí odkaz:
http://arxiv.org/abs/2409.10821
High-precision surface defect detection in manufacturing is essential for ensuring quality control. Laser triangulation profilometric sensors are key to this process, providing detailed and accurate surface measurements over a line. To achieve a comp
Externí odkaz:
http://arxiv.org/abs/2409.03429
The Cosmic Distance Duality Relation (CDDR) defines a fundamental link in modern cosmology between geometric distance measurements and redshift. Any observed deviations from the CDDR could suggest the need for new physics beyond the $\Lambda$CDM mode
Externí odkaz:
http://arxiv.org/abs/2408.13390
Autor:
Sabogal, Miguel A., Silva, Emanuelly, Nunes, Rafael C., Kumar, Suresh, Di Valentino, Eleonora, Giarè, William
In recent years, Cosmic Microwave Background (CMB) observations, Weak Lensing surveys, and $f(z)\sigma_8(z)$ measurements from Redshift-Space Distortions (RSD) have revealed a significant ($\sim$3$-$5$\sigma$) discrepancy in the inferred value of the
Externí odkaz:
http://arxiv.org/abs/2408.12403
Autor:
Sabogal, Miguel A., Akarsu, Özgür, Bonilla, Alexander, Di Valentino, Eleonora, Nunes, Rafael C.
In this study, we investigate deviations from the Planck-$\Lambda$CDM model in the late universe ($z \lesssim 2.5$) using the Gaussian Processes method, with minimal assumptions. Our goal is to understand where exploring new physics in the late unive
Externí odkaz:
http://arxiv.org/abs/2407.04223
The three-point correlation function (3PCF) of a weak lensing shear field contains information that is complementary to that in the two-point correlation function (2PCF), which can help improve the cosmological parameters and calibrate astrophysical
Externí odkaz:
http://arxiv.org/abs/2407.01798
Autor:
Akarsu, Ozgur, De Felice, Antonio, Di Valentino, Eleonora, Kumar, Suresh, Nunes, Rafael C., Ozulker, Emre, Vazquez, J. Alberto, Yadav, Anita
The idea of a rapid sign-switching cosmological constant (mirror AdS-dS transition) in the late universe at $z\sim1.7$, known as the $\Lambda_{\rm s}$CDM model, has significantly improved the fit to observational data and provides a promising scenari
Externí odkaz:
http://arxiv.org/abs/2406.07526
Autor:
Gonzalez, Javier E., Ferreira, Marcelo, Colaço, Leorando R., Holanda, Rodrigo F. L., Nunes, Rafael C.
Publikováno v:
Physics Letters B 857 (2024) 138982
In this work, we obtain Hubble constant ($H_0$) estimates by using two galaxy cluster gas mass fraction measurement samples, Type Ia supernovae luminosity distances, and the validity of the cosmic distance duality relation. Notably, the angular diame
Externí odkaz:
http://arxiv.org/abs/2405.13665
Autor:
Alvarado, Rafael C.
The Monty Hall problem is notorious for its deceptive simplicity. Although today it is widely used as a provocative thought experiment to introduce Bayesian thinking to students of probability, in the not so distant past it was rejected by establishe
Externí odkaz:
http://arxiv.org/abs/2405.00884