Constraints on brane inflation after Planck 2015: Impacts of the latest local measurement of the Hubble constant

Abstract

We investigate the observational constraints on three typical brane inflation models by considering the latest local measurement of the Hubble constant in the global fit. We also employ other observational data, including the Planck 2015 CMB data, the BICEP2/Keck Array B-mode data, and the baryon acoustic oscillations data, in our analysis. Previous studies have shown that the addition of the latest local $H_0$ measurement favors a larger spectral index, and can exert a significant influence on the model selection of inflation. In this work, we investigate its impacts on the status of brane inflation models. We find that, when the direct $H_0$ measurement is considered, the prototype model of brane inflation is still in good agreement with the current observational data within the $2\sigma$ level range. For the KKLMMT model, the consideration of the $H_0$ measurement allows the range of the parameter $\beta$ to be amplified to $\mathcal{O}(10^{-2})$, which slightly alleviates the fine-tuning problem. For the IR DBI model, the addition of the $H_0$ measurement does not provide a better fit. These results show that the consideration of the new $H_0$ prior can exert a considerable influence on the brane inflation models. At last, we show that, when $\beta \lesssim 1.1$, the equilateral non-Gaussianity in the IR DBI inflation model is compatible with the current CMB data at the 1$\sigma$ level.

9 pages, 4 figures

References in corpus (21)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• A Microscopic Limit on Gravitational Waves from D-brane Inflation
• Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations
• Holographic Systematics of D-brane Inflation
• How the Dark Energy Can Reconcile \textit{Planck} with Local Determination of the Hubble Constant
• Sterile neutrinos help reconcile the observational results of primordial gravitational waves from Planck and BICEP2
• Precise measurements of inflationary features with 21 cm observations
• Cosmological constraints on neutrinos after BICEP2
• Features from the non-attractor beginning of inflation
• Neutrinos and dark energy after Planck and BICEP2: data consistency tests and cosmological parameter constraints
• Measuring growth index in a universe with massive neutrinos: A revisit of the general relativity test with the latest observations
• CMB constraints on $\beta$-exponential inflationary models
• Single field inflation with modulated potential in light of the Planck and BICEP2
• A comment on power-law inflation with a dark radiation component
• Brane Inflation After WMAP Three Year Results
• Pre-inflationary genesis with CMB B-mode polarization
• Lyth bound revisited
• A Note on Noncommutative Brane Inflation
• Noncommutative KKLMMT Model
• Reducing the Tension Between the BICEP2 and the Planck Measurements: A Complete Exploration of the Parameter Space

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