CENTRA Seminar - 3-form Cosmology - 6 junho 2013
CAAUL, Univ. de Lisboa
Abstract / Resumo
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.
6 de junho de 2013 | 14:30
Meeting room on the 2nd floor of the Physics Department building
Watch it live on: http://www.ustream.tv/channel/centra---ist-seminars (also available on CENTRA TV webpage)
Talks' slides: http://centra.ist.utl.pt/~blackholes/seminars/nunes.pdf (available right before the seminar)