Observational constraints of the Gravitational Waves in the Brans-Dicke Theory
Freitas, R. C. · Gonçalves, S. V. B.
Original · EN
We investigate the quantum origin of the primordial cosmological gravitational waves in the Brans-Dicke theory. We compute the number of gravitons Nₖ produced during inflation and the observables: power spectrum Pₜ, spectral index nₜ and energy density Ωₖ. By comparison with General Relativity we see that the results for both theories are the same for the case of the particles number Nₖ and for the case of the power spectrum Pₜ and the energy density Ω only when ω<10. For the spectral index nₜ we found that when the Brans-Dicke coupling parameter ω is bigger than unity the spectral index approximates the expression found in the General Relativity. This may awake us to the possibility that ω varies with the cosmological scale.
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