|
Journal of Physical Studies 9(3), 198–209 (2005)
DOI: https://doi.org/10.30970/jps.09.198 COSMOLOGICAL CONSTRAINTS ON THE AMPLITUDE OF RELIC GRAVITATIONAL WAVESB. Novosyadlyj, S. Apunevych
Ivan Franko National University of Lviv, Astronomical
Observatory |
 |
The evolution of the amplitude of relic gravitational waves (RGW) generated in early Universe has been analyzed. The analytical approximation is presented for angular power spectrum of cosmic microwave background anisotropies caused by gravitational waves through Sachs-Wolfe effect. The estimate of the most probable value for this amplitude was obtained on the basis of observational data on cosmic microwave background anisotropies from COBE, WMAP and BOOMERanG experiments along with large-scale structure observations. It has been shown that the aggregate of modern data on large-scale structure and CMB implies the absence or a low amplitude of relic gravitational waves so that at 95 onfidence level their contribution to the power of CMB anisotropies at the quadrupole component does not exceed 60 0.000000e+000ven for extremely steep ($n_t = -1$) spectrum of tensor perturbations. For the flat spectrum ($n_t = 0$) as well as models with $n_t\sim (n_s-1)$ this contribution does not exceed 18% at the $2σ$ confidence level.
PACS number(s): 04.50.+h, 04.20.Jb