Primordial Spikes from Wrapped Brane Inflation

Abstract

Cosmic inflation driven by branes wrapping the extra dimensions involves Kaluza-Klein (KK) degrees of freedom in addition to the zero-mode position of the brane which plays the role of the inflaton. As the wrapped brane passes by localized sources or features along its inflationary trajectory in the extra dimensional space, the KK modes along the wrapped direction are excited and start to oscillate during inflation. We show that the oscillating KK modes induce parametric resonance for the curvature perturbations, generating sharp signals in the perturbation spectrum. The effective four dimensional picture is a theory where the inflaton couples to the heavy KK modes. The Nambu-Goto action of the brane sources couplings between the inflaton kinetic terms and the KK modes, which trigger significant resonant amplification of the curvature perturbations. We find that the strong resonant effects are localized to narrow wave number ranges, producing spikes in the perturbation spectrum. Investigation of such resonant signals opens up the possibility of probing the extra dimensional space through cosmological observations.

45 pages, 8 figures, v2: published in JCAP, v3: fixed typos in appendix

References in corpus (20)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Monodromy in the CMB: Gravity Waves and String Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
• Simple de Sitter Solutions
• Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
• Trapped Inflation
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Influence of heavy modes on perturbations in multiple field inflation
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Effects of particle production during inflation
• On Features and Nongaussianity from Inflationary Particle Production
• Inflation from Wrapped Branes
• Searching for Standard Clocks in the Primordial Universe
• Band-power reconstruction of the primordial fluctuation spectrum by the maximum likelihood reconstruction method
• The effect of varying sound velocity on primordial curvature perturbations
• Resonant Signatures of Heavy Scalar Fields in the Cosmic Microwave Background
• Dangerous Angular KK/Glueball Relics in String Theory Cosmology
• Effects of Light Fields During Inflation

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• Localized Features in Non-Gaussianity from Heavy Physics
• Late time sky as a probe of steps and oscillations in primordial Universe
• Combined features in the primordial spectra induced by a sudden turn in two-field DBI inflation
• A Universal Bound on Excitations of Heavy Fields during Inflation
• DBI Inflation and Warped Black Holes
• The Effect of $\alpha$-Vacua on the Scalar and Tensor Spectral Indices: Slow-Roll Approximation
• Trans-Planckian Effects in Warm Inflation
• Revisiting the oscillations in the CMB angular power spectra at $\ell \sim 120$ in the Planck2015 data
• Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys