Inflationary Cosmology with Quantum Gravitational Effects and the Swampland Conjectures

Abstract

Recently proposed two swampland criteria that arising from string theory landscape lead to the important challenge of the realization of single-field inflationary models. Especially one of swampland criteria which implies a large tensor-to-scalar ratio is strongly in tension with recent observational results. In this paper, we explore the possibility if the swampland conjectures could be compatible with single-field inflationary scenarios if the effects due to the quantum theory of gravity are considered. We show that the quantum gravitational effects due to the nonlinear dispersion relation provides significant modifications on the amplitude of both the scalar and tensor perturbation spectra. Such modifications could be either raise or reduce the perturbation spectra depending on the values of the parameters in the nonlinear terms of the dispersion relations. Therefore, these effects can reduce the tensor-to-scalar ratio to a smaller value which helps to relax the tension between the swampland conjecture and observational data.

arXiv comment7 pages, 2 figures

References in corpus (44)

• Quantum Gravity at a Lifshitz Point
• On the Geometry of the String Landscape and the Swampland
• The Trans-Planckian Problem of Inflationary Cosmology
• Distance and de Sitter Conjectures on the Swampland
• On the Cosmological Implications of the String Swampland
• BICEP2 / Keck Array x: Constraints on Primordial Gravitational Waves using Planck, WMAP, and New BICEP2/Keck Observations through the 2015 Season
• Towards a Nonsingular Bouncing Cosmology
• Hořava Gravity at a Lifshitz Point: A Progress Report
• Trans-Planckian Issues for Inflationary Cosmology
• A note on Inflation and the Swampland
• The stress-energy tensor for trans-Planckian cosmology
• Pre-inflationary universe in loop quantum cosmology
• Back-Reaction and the Trans-Planckian Problem of Inflation Revisited
• Non-singular bounce scenarios in loop quantum cosmology and the effective field description
• Bouncing cosmologies with dark matter and dark energy
• A Note on Calm Excited States of Inflation
• Effects of parity violation on non-gaussianity of primordial gravitational waves in Hořava-Lifshitz gravity
• A $\Lambda$CDM bounce scenario
• General covariant Horava-Lifshitz gravity without projectability condition and its applications to cosmology
• Primordial perturbation with a modified dispersion relation
• U(1) symmetry and elimination of spin-0 gravitons in Horava-Lifshitz gravity without the projectability condition
• Trans-Planckian Particle Creation in Cosmology and Ultra-High Energy Cosmic Rays
• Steep Eternal Inflation and the Swampland
• Universal features of quantum bounce in loop quantum cosmology
• Higgs Inflation and the Refined dS Conjecture
• Effects of Nonlinear Dispersion Relations on Non-Gaussianities
• Inflationary cosmology with nonlinear dispersion relations
• Extended Effective Field Theory of Inflation
• Primordial Black Holes and the String Swampland
• Non-adiabatic Evolution of Primordial Perturbations and non-Gaussinity in Hybrid Approach of Loop Quantum Cosmology
• Gravitational quantum effects on power spectra and spectral indices with higher-order corrections
• Primordial non-Gaussianity and power asymmetry with quantum gravitational effects in loop quantum cosmology
• Detecting quantum gravitational effects of loop quantum cosmology in the early universe?
• Inflationary spectra with inverse-volume corrections in loop quantum cosmology and their observational constraints from Planck 2015 data
• High-order Primordial Perturbations with Quantum Gravitational Effects
• Primordial Spectra of slow-roll inflation at second-order with the Gauss-Bonnet correction
• Scalar and tensor perturbations in loop quantum cosmology: High-order corrections
• Inflation in general covariant Hořava-Lifshitz gravity without projectability
• Power spectra and spectral indices of $k$-inflation: high-order corrections
• Constructing analytical solutions of linear perturbations of inflation with modified dispersion relations
• Pre-inflationary dynamics of Starobinsky inflation and its generization in Loop Quantum Brans-Dicke Cosmology
• Getting Super-Excited with Modified Dispersion Relations
• Gravitational quantum effects in the light of BICEP2 results
• Non-Unitary Evolution in the General Extended EFT of Inflation & Excited Initial States

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• Quantum aspects of chaos and complexity from bouncing cosmology: A study with two-mode single field squeezed state formalism
• Background dynamics of pre-inflationary scenario in Brans-Dicke loop quantum cosmology
• Topological Eternal Hilltop Inflation and the Swampland Criteria
• Inflationary perturbation spectrum in extended effective field theory of inflation
• Hořava-Lifshitz $F(\bar{R})$ theories and the Swampland