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8 papers · 2 filters
Cosmology with a Continuous Tower of Scalar Fields
Jose Beltrán Jiménez, David F. Mota, Paulo Santos
We study the cosmological evolution for a universe in the presence of a continuous tower of massive scalar fields which can drive the current phase of accelerated expansion of the…
Screening Vector Field Modifications of General Relativity
Jose Beltrán Jiménez, André Luís Delvas Fróes, David F. Mota
A screening mechanism for conformal vector-tensor modifications of general relativity is proposed. The conformal factor depends on the norm of the vector field and makes the field…
Background reionization history from omniscopes
Sebastien Clesse, Laura Lopez-Honorez, Christophe Ringeval +2
The measurements of the 21-cm brightness temperature fluctuations from the neutral hydrogen at the Epoch of Reionization (EoR) should inaugurate the next generation of cosmological…
Searching for Standard Clocks in the Primordial Universe
Xingang Chen, Christophe Ringeval
Classically oscillating massive fields can be used as "standard clocks" in the primordial universe. They generate features in primordial density perturbations that directly record…
Scale dependent halo bias in the excursion set approach
Marcello Musso, Aseem Paranjape, Ravi K. Sheth
If one accounts for correlations between scales, then nonlocal, k-dependent halo bias is part and parcel of the excursion set approach, and hence of halo model predictions for gala…
All sky CMB map from cosmic strings integrated Sachs-Wolfe effect
Christophe Ringeval, Francois R. Bouchet
By actively distorting the Cosmic Microwave Background (CMB) over our past light cone, cosmic strings are unavoidable sources of non-Gaussianity. Developing optimal estimators able…