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Non-Gaussianity in the Cosmic Microwave Background Induced by Dipolar Dark Matter
Luc Blanchet, David Langlois, Alexandre Le Tiec +1
In previous work [L. Blanchet and A. Le Tiec, Phys. Rev. D 80, 023524 (2009)], motivated by the phenomenology of dark matter at galactic scales, a model of dipolar dark matter (DDM…
Non-Gaussianities from isocurvature modes
David Langlois
This contribution discusses isocurvature modes, in particular the non-Gaussianities of local type generated by these modes. Since the isocurvature transfer functions differ from th…
Cosmological solutions of massive gravity on de Sitter
David Langlois, Atsushi Naruko
In the framework of the recently proposed models of massive gravity, defined with respect to a de Sitter reference metric, we obtain new homogeneous and isotropic solutions for arb…
Influence of heavy modes on perturbations in multiple field inflation
Xian Gao, David Langlois, Shuntaro Mizuno
We investigate linear cosmological perturbations in multiple field inflationary models where some of the directions are light while others are heavy (with respect to the Hubble par…
Isocurvature modes in the CMB bispectrum
David Langlois, Bartjan van Tent
We study the angular bispectrum of local type arising from the (possibly correlated) combination of a primordial adiabatic mode with an isocurvature one. Generically, this bispectr…