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The gravitational wave contribution to cosmic microwave background anisotropies and the amplitude of mass fluctuations from COBE resultsA 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.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Lucchin, Francesco (NASA Lewis Research Center Cleveland, OH, United States)
Matarrese, Sabino (Padova, Univ. Padua, Italy)
Mollerach, Silvia (NASAFermilab Astrophysics Center Batavia, IL, United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 401
Issue: 2
ISSN: 0004-637X
Subject Category
Funding Number(s)
Distribution Limits