On gravitational waves generated during inflation under the influence of a dynamical cosmological “constant”
Departamento de Matemáticas, Centro Universitario de Ciencias Exactas e Ingenierías (CUCEI), Universidad de Guadalajara, Av. Revolución 1500, S.R. 44430, Guadalajara, Jalisco, México
Accepted: 30 October 2012
Published online: 27 November 2012
We study cosmological gravitational waves generated during inflation under the influence of a decaying cosmological “constant”, in the Transverse-Traceless (TT) gauge. In our approach we consider a non-perturbative contribution of the dynamical cosmological “constant” to the tensor modes. As an application of the model we study the well-known cases and . The spectrum of gravitational waves for the first case results scale invariant at the end of inflation, whereas for the second case scale invariance is not achieved, leaving this to new proposals of the form: , in order to include inflation in some models. We also found that the non-perturbative contributions of (t) , accelerate the decreasing of the amplitude of gravitational waves during a power law inflationary stage, by an exponential factor.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2012