1 citations · 1 across the 1 of their papers we have counts for
7 papers
Non-vacuum initial states for the cosmological perturbations and the back-reaction problem of inflation
Alejandro Gangui, Jerome Martin, Mairi Sakellariadou
In the framework of Inflationary theory, the assumption that the quantum state of the perturbations is a non-vacuum state leads to a difficulty: non-vacuum initial states imply, in…
Topological Defects in Cosmology
Alejandro Gangui
Topological defects are ubiquitous in condensed-matter physics but only hypothetical in the early universe. In spite of this, even an indirect evidence for one of these cosmic obje…
The best unbiased estimator for the CMB angular bispectrum
Alejandro Gangui
For those angular multipoles where cosmic variance is an issue, non-Gaussianities in the Cosmic Microwave Background (CMB) anisotropies will be hard to detect. Here, we construct e…
Textures and Cosmic Microwave Background non-Gaussian Signatures
Alejandro Gangui
We report briefly on a recent analysis of the texture-induced CMB radiation three-point correlation function of temperature anisotropies as predicted by an analytical model. We spe…
Non-Gaussian Fluctuations From Textures
Alejandro Gangui
One of the most powerful tools to probe the existence of cosmic defects in the early universe is through the Cosmic Microwave Background (CMB) radiation. It is well known that comp…
Global textures and the Doppler peaks
Alejandro Gangui, Ruth Durrer, Mairi Sakellariadou
We review recent work aimed at showing how global topological defects influence the shape of the angular power spectrum of the CMB radiation on small scales. While Sachs-Wolfe fluc…