Browsing by Author "Pi, Shi"

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On the possibility of blue tensor spectrum within single field inflation
(2015-11-01)
Cai, Yi-Fu
;
Gong, Jinn-Ouk
;
Pi, Shi
;
Saridakis, Emmanuel N.
;
Wu, Shang-Yu
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. (C) 2015 The Authors. Published by Elsevier B.V.