期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/07/022
关键词
inflation; primordial gravitational waves (theory); physics of the early universe; cosmological perturbation theory
资金
- 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)
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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