INVESTIGADORES
GANGUI Alejandro
artículos
Título:
Cosmic Microwave Background Bispectrum and Slow Roll Inflation
Autor/es:
ALEJANDRO GANGUI; JEROME MARTIN
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Blackwell Publishing
Referencias:
Año: 2000 vol. 313 p. 323 - 330
ISSN:
0035-8711
Resumen:
Recent tentative findings of non-Gaussian structure in the COBE-DMR
data set have triggered renewed attention on candidate models from
which such intrinsic signature could arise. In the framework of
slow-roll inflation with built-in non-linearities in the inflaton field
evolution, we present expressions for both the cosmic microwave
background (CMB) skewness and the full angular bispectrum Cℓ1ℓ2ℓ3
in terms of the slow-roll parameters. We use an estimator for the
angular bispectrum recently proposed in the literature and calculate
its variance for an arbitrary ℓi multipole
combination. We stress that a real detection of non-Gaussianity in the
CMB would imply that an important component of the anisotropies arises
from processes other than primordial quantum fluctuations. We
further investigate the behaviour of the signal-to-(theoretical) noise
ratio and demonstrate for generic inflationary models that it decreases
in the limited range of small ℓs considered for increasing multipole ℓ,
while the opposite applies for the standard Cℓs.
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