INVESTIGADORES
MOLLERACH Maria Silvia
artículos
Título:
The gravitational wave contribution to cosmic microwave background anisotropies and the amplitude of mass fluctuations from COBE results
Autor/es:
LUCCHIN, FRANCESCO; MATARRESE, SABINO; MOLLERACH, SILVIA
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Año: 1992 p. 49 - 52
ISSN:
0004-637X
Resumen:
A stochastic background of primordial gravitational waves may
substantially contribute, via the Sachs-Wolfe effect, to the large-scale
cosmic microwave background (CMB) anisotropies recently detected by
COBE. This implies a bias in any resulting determination of the
primordial amplitude of density fluctuations. We consider the
constraints imposed on n is less than 1 ('tilted') power-law fluctuation
spectra, taking into account the contribution from both scalar and
tensor waves, as predicted by power-law inflation. The gravitational
wave contribution to CMB anisotropies generally reduces the required rms
level of mass fluctuation, thereby increasing the linear bias parameter,
even in models where the spectral index is close to the
Harrison-Zel'dovich value n = 1. This 'gravitational wave bias' helps to
reconcile the predictions of CDM models with observations on pairwise
galaxy velocity dispersion on small scales.