INVESTIGADORES
MOLLERACH Maria Silvia
artículos
Título:
Cosmic microwave background anisotropies from second order gravitational perturbations
Autor/es:
MOLLERACH, SILVIA; MATARRESE, SABINO
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 1997 vol. 56 p. 4494 - 4502
ISSN:
0556-2821
Resumen:
This paper presents a complete analysis of the effects of second order
gravitational perturbations on cosmic microwave background anisotropies,
taking explicitly into account scalar, vector and tensor modes. We also
consider the second order perturbations of the metric itself obtaining
them, for a universe dominated by a collisionless fluid, in the Poisson
gauge, by transforming the known results in the synchronous gauge. We
discuss the resulting second order anisotropies in the Poisson gauge,
and analyze the possible relevance of the different terms. We expect
that, in the simplest scenarios for structure formation, the main effect
comes from the gravitational lensing by scalar perturbations that is
known to give a few percent contribution to the anisotropies at small
angular scales.