Skip to content

Tilted ekpyrosis

Research output: Contribution to journalArticlepeer-review

We consider a simple model of cosmological collapse driven by canonical fields with exponential potentials. We generalize the two-field ekpyrotic collapse to consider nonorthogonal or tilted potentials and give the general condition for isocurvature field fluctuations to have a scale-invariant spectrum in this model. In particular we show that tilted potentials allow for a slightly red spectrum of perturbations as required by current observations. However a red spectrum of fluctuations implies that the two-field ekpyrotic phase must have a finite duration and requires a preceding phase which sets the initial conditions for what otherwise appears to be a fine-tuned trajectory in the phase space.
Original languageEnglish
Pages (from-to)101303
Number of pages1
JournalPhysical Review D
Issue number10
Publication statusPublished - Nov 2011


  • 1109.0448v2.pdf

    Accepted author manuscript (Post-print), 114 KB, PDF document

Related information

Relations Get citation (various referencing formats)

ID: 114299