Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-21
Phys.Rev.D74:043503,2006
Astronomy and Astrophysics
Astrophysics
17 pages including 3 figures. Only style is revised
Scientific paper
10.1103/PhysRevD.74.043503
As the strong evidence for inflation, the relic gravitational waves (RGW) have been extensively studied. Although, it has not been detected, yet some constraints have been achieved by the observations. Future experiments for the RGW detection are mainly two kinds: the CMB experiments and the laser interferometers. In this paper, we study these current constraints and the detective abilities of future experiments. We calculate the strength of RGW $\Omega_g(k)$ in two methods: the analytic method and the numerical method by solving the inflationary flow equations. By the first method we obtain a bound $\Omega_g<3.89\times10^{-16}$ at $\nu=0.1$Hz, where we have used the current constraints on the scalar spectral index, the tensor-scalar ratio, furthermore, we have taken into account of the redshift-suppression effect, the accelerating expansion effect, the neutrino damping effect on the RGW. But the analytic expression of $\Omega_g(k)$ depends on the specific inflationary models and not well applies for the waves with very high frequencies. The numerical method is more precise for the waves with high frequencies and applies to any single-field inflationary model. It gives a bound $\Omega_g<8.62\times10^{-14}$, which is independent of the inflationary parameters, and applies to any single-field slow-roll inflationary model. After considering the current constraints on the inflationary parameters, this bound becomes $\Omega_g<2\times10^{-17}$ (see text).
Zhang Yang
Zhao Wen
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