Gravitational waves during inflation from a 5D large-scale repulsive gravity model
LUZ MARINA REYES; CLAUDIA MORENO; JOSÉ EDGAR MADRIZ AGUILAR; MAURICIO BELLINI
PHYSICS LETTERS B
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2012 vol. 717 p. 17 - 17
We investigate, in the transverse traceless (TT) gauge, the generation of the relic background of gravitational waves, generated during the early inﬂationary stage, on the framework of a largescale repulsive gravity model. We calculate the spectrum of the tensor metric ﬂuctuations of an eﬀective 4D Schwarzschild-de-Sitter metric on cosmological scales. This metric is obtained after implementing a planar coordinate transformation on a 5D Ricci-ﬂat metric solution, in the context of a non-compact Kaluza-Klein theory of gravity. We found that the spectrum is nearly scale invariant under certain conditions. One interesting aspect of this model is that it is possible to derive the dynamical ﬁeld equations for the tensor metric ﬂuctuations, valid not just at cosmological scales, but also at astrophysical scales, from the same theoretical model. The astrophysical and cosmological scales are determined by the gravity- antigravity radius, which is a natural length scale of the model, that indicates when gravity becomes repulsive in nature.