Strong Planck constraints on braneworld and non-commutative inflation

Gianluca Calcagni, Sachiko Kuroyanagi, Junko Ohashi, Shinji Tsujikawa

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


We place observational likelihood constraints on braneworld and non-commutative inflation for a number of inflaton potentials, using Planck, WMAP polarization and BAO data. Both braneworld and non-commutative scenarios of the kind considered here are limited by the most recent data even more severely than standard general-relativity models. At more than 95 % confidence level, the monomial potential V(φ)φp is ruled out for p 2 in the Randall-Sundrum (RS) braneworld cosmology and, for p > 0, also in the high-curvature limit of the Gauss-Bonnet (GB) braneworld and in the infrared limit of non-commutative inflation, due to a large scalar spectral index. Some parameter values for natural inflation, small-varying inflaton models and Starobinsky inflation are allowed in all scenarios, although some tuning is required for natural inflation in a non-commutative spacetime.

Original languageEnglish
Article number052
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
Publication statusPublished - 2014 Mar
Externally publishedYes


  • cosmology of theories beyond the SM
  • inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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