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On the possibility of blue tensor spectrum within single field inflation · Around

2014

On the possibility of blue tensor spectrum within single field inflation

Cai, Yi-Fu, Gong, Jinn-Ouk, Pi, Shi et al.

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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.

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