Zobrazeno 1 - 10
of 953
pro vyhledávání: '"Nunes, Rafael"'
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.
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 diamet
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
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
Publikováno v:
Eur.Phys.J.C 84 (2024) 302
The Kerr spacetime is a fundamental solution of general relativity (GR), describing the gravitational field around a rotating, uncharged black hole (BH). Kerr spacetime has been crucial in modern astrophysics and it serves as a foundation for the stu
Externí odkaz:
http://arxiv.org/abs/2403.17718
This paper simplifies the induced four-dimensional gravitational equations originating from a five-dimensional bulk within the framework of Nash's embeddings, incorporating them into a well-known $\mu-\Sigma$ modified gravity (MG) parametrization. By
Externí odkaz:
http://arxiv.org/abs/2403.13860
A possible interaction between cold dark matter and dark energy, corresponding to a well-known interacting dark energy model discussed in the literature within the context of resolving the Hubble tension, has been investigated. We put constraints on
Externí odkaz:
http://arxiv.org/abs/2403.00056