Scalar tilt from broken conformal invariance

Published 20 Jul 2010 in hep-th | (1007.3417v1)

Abstract: Within recently proposed scenario which explains flatness of the spectrum of scalar cosmological perturbations by a combination of conformal and global symmetries, we discuss the effect of weak breaking of conformal invariance. We find that the scalar power spectrum obtains a small tilt which depends on both the strength of conformal symmetry breaking and the law of evolution of the scale factor.

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