Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity

Details Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity

2004-07-23

arxiv.org/abs/astro-ph/0407505v2

Phys.Rev.Lett. 93 (2004) 231301

Astronomy and Astrophysics

Astrophysics

4 pages, LaTeX file. Revised to match the version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.231301

We provide the gauge-invariant expression for large-scale cosmic microwave background temperature fluctuations at second-order in perturbation theory. It enables to unambiguously define the nonlinearity parameter f_NL which is used by experimental collaborations to pin down the level of Non-Gaussianity in the temperature fluctuations. Furthermore, it contains a primordial term encoding all the information about the Non-Gaussianity generated at primordial epochs and about the mechanism which gave rise to cosmological perturbations, thus neatly disentangling the primordial contribution to Non-Gaussianity from the one caused by the post-inflationary evolution.

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