134 citations · 770 across the 19 of their papers we have counts for
11 papers · 1 filter
Measuring in the Early Universe: CMB Polarization, Reionization and the Fisher Matrix Analysis
G. Rocha, R. Trotta, C. J. A. P. Martins +4
We present a detailed analysis of present and future Cosmic Microwave Background constraints of the value of the fine-structure constant, . We carry out a more detailed analysis…
New constraints on varying
G. Rocha, R. Trotta, C. J. A. P. Martins +3
We present a summary of recent constraints on the value of the fine-structure constant at the epoch of decoupling from the recent observations made by the Wilkinson Microwave Aniso…
Measuring in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis
C. J. A. P. Martins, A. Melchiorri, R. Trotta +4
We extend our recent work on the effects of a time-varying fine-structure constant in the cosmic microwave background, by providing a thorough analysis of the degeneracies betw…
CMB constraints on spatial variations of the vacuum energy density
P. P. Avelino, A. Canavezes, J. P. M. de Carvalho +1
In a recent article, a simple `spherical bubble' toy model for a spatially varying vacuum energy density was introduced, and type Ia supernovae data was used to constrain it. Here…
Supernova constraints on spatial variations of the vacuum energy density
P. P. Avelino, J. P. M. de Carvalho, C. J. A. P. Martins
We consider a very simple toy model for a spatially varying `cosmological constant', where we are inside a spherical bubble (with a given set of cosmological parameters) that is su…
Early-universe constraints on a time-varying fine structure constant
P. P. Avelino, S. Esposito, G. Mangano +6
Higher-dimensional theories have the remarkable feature of predicting a time (and hence redshift) dependence of the `fundamental' four dimensional constants on cosmological timesca…