We develop a formalism to study non-Gaussianity in both curvature and isocurvature perturbations. It is shown that non-Gaussianity in the CDM/baryonic isocurvature perturbation leaves distinct signatures in the CMB temperature fluctuations, which may be confirmed in future experiments, or possibly, even in the currently available observational data. As an explicit example, we consider the QCD axion and show that it can actually induce sizable non-Gaussianity.
|Publication status||Published - 2008|
|Event||18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 - Higashi-Hiroshima, Japan|
Duration: 2008 Nov 17 → 2008 Nov 21
|Other||18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008|
|Period||08/11/17 → 08/11/21|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics