Blue running of the primordial tensor spectrum

Journal Article · Tue Jul 01 04:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/07/022· OSTI ID:22373465

Gong, Jinn-Ouk ^[1]

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1. Asia Pacific Center for Theoretical Physics, Pohang 790-784 (Korea, Republic of)

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.

• OSTI ID: 22373465
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2014; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGICAL INFLATION
DECAY
DETECTION
PERTURBATION THEORY
POLARIZATION
SPECTRA
TENSORS