CAAUL Seminar - Three-form Cosmology - 17 setembro 2012
Three-forms can give rise to viable cosmological scenarios of inflation and dark energy with potentially observable signatures distinct from standard single scalar field models.
I will first present an intuitive picture of the background evolution of the minimally coupled three-form in terms of an effective potential and show that it can naturally generate a variety of isotropic background dynamics, including scaling, possibly transient acceleration and phantom crossing.
When applied to primordial inflation, a three-form can have a scale invariant scalar perturbations power spectrum and the consistency relation between the tensor and scalar amplitudes has a dependence on the speed of sound.
Finally, I will demonstrate that a single three-form can have large non-Gaussian signatures.
17 de setembro de 2012 | 14:30
Tapada da Ajuda, OAL Edifício Leste, 2º Piso