期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/06/027
关键词
cosmological perturbation theory; inflation; cosmological parameters from CMBR; string theory and cosmology
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Department of Physics at McGill University
- Chinese National Youth Thousand Talents Program
- USTC start-up funding [KY2030000049]
- Natural Science Foundation of China [11421303]
- National Science Foundation (NSF) [PHY11-25915]
- CNPq (Science without Borders)
- Fonds de recherche du Quebec - Nature et technologies (FRQNT)
- Walter C. Sumner Foundation
- NSERC via the Vanier Canada Graduate Scholarships program
- Canada Foundation for Innovation (CFI)
- NanoQuebec
- RMGA
- FRQNT
We propose a new realization of axion monodromy inflation in which axion monodromy arises from torsional cycles in a type IIB compactification. A class of monomial potentials is obtained with specific values for the power index. Moreover, the inflaton mass changes profile due to the couplings between various fields after compactification. Consequently, the potential obtains a step-like profile at some critical scale. We study the cosmological implications of one concrete realization of this model. At the background level, it realizes a sufficiently long inflationary stage, which allows for the violation of the slow-roll conditions for a short period of time when the inflaton is close to the critical scale. Accordingly, the Hubble horizon is perturbed and affects the dynamics of primordial cosmological perturbations. In particular, we analyze the angular power spectrum of B-mode polarization and find a boost on very large scales. We also find that the amplitude of scalar perturbations is suppressed near the critical scale. Thus our model provides an interpretation for the low-f suppression of temperature anisotropies in the CMB power spectrum. We examine these effects and confront the model to observations.
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