Journal
NUCLEAR PHYSICS B
Volume 900, Issue -, Pages 517-532Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysb.2015.09.025
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Funding
- Chinese National Youth Thousand Talents Program
- USTC [KY2030000049]
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Department of Physics at McGill
- Max-Planck-Gesellschaft
- Korea Ministry of Education, Science and Technology
- Gyeongsangbuk-Do
- Basic Science Research Program of the National Research Foundation of Korea [2013R1A1A1006701]
- European Social Fund (ESF)
- Ministry of Science and Technology, Taiwan
- National Center of Theoretical Science in Taiwan
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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. (C) 2015 The Authors. Published by Elsevier B.V.
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