299 citations · 1k across the 32 of their papers we have counts for
17 papers · 1 filter
Do DESI-DR2 BAO data imply a coupling of dark matter and dark energy?
Weiqiang Yang, Sibo Zhang, Dinorah Barbosa +3
We revisit an interacting dark matter (DM) -- dark energy (DE) model characterized by the interaction function , where is a constant coupling parameter and is t…
A Periodically Interacting Dark Sector: Signatures and Constraints from CMB and Cosmic Expansion Data
Marco Antonio Cardoso Alvarez, Micol Benetti, Leila Graef +1
We introduce a novel cosmological model that provides an effective description of the back-reaction of super-Hubble fluctuations on the cosmological background, a generic effect ex…
Sound Speed Resonance in the Gravitational Wave Background as a probe for non-standard early universe cosmologies
Igor de O. C. Pedreira, Amara Ilyas, Ziwei Wang +2
Gravitational waves constitute a powerful probe of the underlying theory of gravity. In extensions of general relativity, additional degrees of freedom, such as scalar fields in th…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Back-Reaction of Super-Hubble Fluctuations, Late Time Tracking and Recent Observational Results
Marco Antonio Cardoso Alvarez, Leila Graef, Robert Brandenberger
Previous studies suggested that the back-reaction of super-Hubble cosmological fluctuations could lead to a dynamical relaxation of the cosmological constant. Moreover, this mechan…
Constraints on Metastable Dark Energy Decaying into Dark Matter
J. S. T. de Souza, G. S. Vicente, L. L. Graef
We revisit the proposal that an energy transfer from dark energy into dark matter can be described in field theory by a first order phase transition. We analyze the model proposed…
A visual tool for assessing tension-resolving models in the - plane
Igor de O. C. Pedreira, Micol Benetti, Elisa G. M. Ferreira +2
Beyond-CDM models have been proposed to address various shortcomings of the standard cosmological model, such as the ``Hubble tension.'' These models often have an impact on the…
An empirical investigation into cosmological tensions
Ramon de Sá, Micol Benetti, Leila Lobato Graef
The possibility that the tension is a sign of a physics beyond the CDM model is one of the most exciting possibilities in modern cosmology. The challenge of solving this p…
Primordial gravitational waves from NANOGrav: a broken power-law approach
Micol Benetti, Leila Lobato Graef, Sunny Vagnozzi
We revisit the possibility that the stochastic common-spectrum process recently detected by the NANOGrav pulsar timing array experiment could be due to primordial gravitational wav…
Observational Constraints on Warm Inflation in Loop Quantum Cosmology
Micol Benetti, Leila Graef, Rudnei O. Ramos
By incorporating quantum aspects of gravity, Loop Quantum Cosmology (LQC) provides a self-consistent extension of the inflationary scenario, allowing for modifications in the primo…
Primordial gravitational waves and the H0-tension problem
Leila L. Graef, Micol Benetti, Jailson S. Alcaniz
We analyse the H0-tension problem in the context of models of the early universe that predict a blue tilted spectrum of primordial gravitational waves (GW's). By considering the GW…
The and tensions and the scale invariant spectrum
Micol Benetti, Leila L. Graef, Jailson S. Alcaniz
In a previous communication we showed that a joint analysis of Cosmic Microwave Background (CMB) data and the current measurement of the local expansion rate favours a model with a…
Constraining the Break of Spatial Diffeomorphism Invariance with Planck Data
L. L. Graef, M. Benetti, J. S. Alcaniz
The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polariz…
Do joint CMB and HST data support a scale invariant spectrum?
Micol Benetti, Leila L. Graef, Jailson S. Alcaniz
We combine current measurements of the local expansion rate, , and Big Bang Nucleosynthesis (BBN) estimates of helium abundance with the latest cosmic microwave background (CM…
Breaking of Spatial Diffeomorphism Invariance, Inflation and the Spectrum of Cosmological Perturbations
Leila Graef, Robert Brandenberger
Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al recently suggested that,…
On the equivalence of Lambda(t) and gravitationally induced particle production cosmologies
L. L. Graef, F. E. M. Costa, J. A. S. Lima
The correspondence between cosmological models powered by a decaying vacuum energy density and gravitationally induced particle production is investigated. Although being physicall…
The role of Dark Matter interaction in galaxy clusters
C. E. Pellicer, Elisa G. M. Ferreira, Daniel C. Guariento +4
We consider a toy model to analyze the consequences of dark matter interaction with a dark energy background on the overall rotation of galaxy clusters and the misalignment between…