On the possibility of blue tensor spectrum within single field inflation

Yi Fu Cai, Jinn Ouk Gong, Shi Pi, Emmanuel N. Saridakis, Shang Yu Wu

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We present a series of theoretical constraints on the potentially viable inflation models that might yield a blue spectrum for primordial tensor perturbations. By performing a detailed dynamical analysis we show that, while there exists such possibility, the corresponding phase space is strongly bounded. Our result implies that, in order to achieve a blue tilt for inflationary tensor perturbations, one may either construct a non-canonical inflation model delicately, or study the generation of primordial tensor modes beyond the standard scenario of single slow-roll field.

Original languageEnglish
Pages (from-to)517-532
Number of pages16
JournalNuclear Physics, Section B
Volume900
DOIs
StatePublished - 1 Nov 2015

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