Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/07/022
Keywords
inflation; primordial gravitational waves (theory); physics of the early universe; cosmological perturbation theory
Funding
- Max-Planck-Gesellschaft
- Korea Ministry of Education, Science and Technology
- Gyeongsangbuk-Do
- Pohang City
- National Research Foundation of Korea [2013R1A1A1006701]
- National Research Foundation of Korea [2013R1A1A1006701] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We examine the possibility of positive spectral index of the power spectrum of the primordial tensor perturbation produced during inflation in the light of the detection of the B-mode polarization by the BICEP2 collaboration. We find a blue tilt is in general possible when the slow-roll parameter decays rapidly. We present two known examples in which a positive spectral index for the tensor power spectrum can be obtained. We also briefly discuss other consistency tests for further studies on inflationary dynamics.
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