Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-08-07
Astrophys.J.401:L49,1992
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages. Two figures available upon request
Scientific paper
10.1086/186668
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 {\it bias} in any resulting determination of the primordial amplitude of density fluctuations. We consider the constraints imposed on $n<1$ (``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 {\it rms} level of mass fluctuation, thereby increasing the linear {\it 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.
Lucchin Francesco
Matarrese Sabino
Mollerach Silvia
No associations
LandOfFree
The gravitational wave contribution to CMB anisotropies and the amplitude of mass fluctuations from COBE results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The gravitational wave contribution to CMB anisotropies and the amplitude of mass fluctuations from COBE results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The gravitational wave contribution to CMB anisotropies and the amplitude of mass fluctuations from COBE results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-308732