Details

Autor(en) / Beteiligte

• BARTOLO, Nicola
• MATARRESE, Sabino
• RIOTTO, Antonio

Titel

Gauge-invariant temperature anisotropies and primordial non-gaussianity

Ist Teil von

• Physical review letters, 2004-12, Vol.93 (23), p.231301.1-231301.4, Article 231301

Ort / Verlag

Ridge, NY: American Physical Society

Erscheinungsjahr

2004

Quelle

APS_美国物理学会过刊

Beschreibungen/Notizen

• We provide the gauge-invariant expression for large-scale cosmic microwave background temperature fluctuations at second-order perturbation theory. This enables us to define unambiguously 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 postinflationary evolution.