Zobrazeno 1 - 10
of 3 317
pro vyhledávání: '"Nunes, A. C."'
Autor:
Ferreira, Marcelo, Holanda, Rodrigo F. L., Gonzalez, Javier E., Colaço, L. R., Nunes, Rafael C.
Testing possible variations in fundamental constants of nature is a crucial endeavor in observational cosmology. This paper investigates potential cosmological variations in the fine structure constant ($\alpha$) through a non-parametric approach, us
Externí odkaz:
http://arxiv.org/abs/2410.21542
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
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
We investigate the implications of the Baryon Acoustic Oscillation measurements released by the Dark Energy Spectroscopic Instrument (DESI) for Interacting Dark Energy (IDE) models characterized by an energy-momentum flow from Dark Matter to Dark Ene
Externí odkaz:
http://arxiv.org/abs/2404.15232
Autor:
Giarè, William, Zhai, Yuejia, Pan, Supriya, Di Valentino, Eleonora, Nunes, Rafael C., van de Bruck, Carsten
We present a comprehensive reassessment of the state of Interacting Dark Energy (IDE) cosmology, namely models featuring a non-gravitational interaction between Dark Matter (DM) and Dark Energy (DE). To achieve high generality, we extend the dark sec
Externí odkaz:
http://arxiv.org/abs/2404.02110
The Baryon Acoustic Oscillations (BAO) phenomenon provides a unique opportunity to establish a standard ruler at any epoch in the history of the evolving universe. The key lies in identifying a suitable cosmological tracer to conduct the measurement.
Externí odkaz:
http://arxiv.org/abs/2404.00747
Publikováno v:
Eur. Phys. J. C 84 (2024) 1104
Understanding the behavior of the matter power spectrum on non-linear scales beyond the $\Lambda$CDM model is crucial for accurately predicting the large-scale structure (LSS) of the Universe in non-standard cosmologies. In this work, we present an a
Externí odkaz:
http://arxiv.org/abs/2403.19590