Isocurvature modes in the CMB bispectrum
Cosmology and Nongalactic Astrophysics
2015-06-04 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
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 bispectrum can be decomposed into six elementary bispectra. We estimate how precisely CMB data, including polarization, can enable us to measure or constrain the six corresponding amplitudes, considering separately the four types of isocurvature modes (CDM, baryon, neutrino density, neutrino velocity). Finally, we discuss how the model-independent constraints on the bispectrum can be combined to get constraints on the parameters of multiple-field inflation models.
Keywords
Cite
@article{arxiv.1204.5042,
title = {Isocurvature modes in the CMB bispectrum},
author = {David Langlois and Bartjan van Tent},
journal= {arXiv preprint arXiv:1204.5042},
year = {2015}
}
Comments
29 pages, 19 figures. v2: minor textual changes, matches published version