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10 papers · 2 filters
Constraints on Inflation
Pedro Viana
A short introduction to structure formation is given, followed by a discussion of the possible characteristics of the initial perturbations assuming a generic inflationary origin.…
Looking for a varying in the Cosmic Microwave Background
P. P. Avelino, C. J. A. P. Martins, G. Rocha +1
We perform a likelihood analysis of the recently released BOOMERanG and MAXIMA data, allowing for the possibility of a time-varying fine-structure constant. We find that in general…
Bayesian joint estimation of non-Gaussianity and the power spectrum
Graca Rocha, Joao Magueijo, Mike Hobson +1
We propose a rigorous, non-perturbative, Bayesian framework which enables one jointly to test Gaussianity and estimate the power spectrum of CMB anisotropies. It makes use of the H…
Primordial Gaussian Fluctuations from Cosmic Defects
P. P. Avelino, C. J. A. P. Martins
We extend our recent work on ``two-metric'' theories of gravity by showing how in such models cosmic defects can produce a spectrum of primordial Gaussian density perturbations. Th…
Can our Universe be inhomogeneous on large sub-horizon scales ?
P. P. Avelino, J. P. M. de Carvalho, C. J. A. P. Martins +1
We show that our Universe may be inhomogeneous on large sub-horizon scales without us being able to realise it. We assume that a network of domain walls permeates the universe divi…
The excitation and kinematical properties of H2 and [FeII] in the HH46/47 bipolar outflow
Amadeu Fernandes
Long slit spectra of the molecular outflow Herbig-Haro (HH) 46/47 has been taken in the J and K near-infrared bands. The observed H2 line emission confirms the existence of a brigh…