Inflationary Cosmology with Quantum Gravitational Effects and Swampland Conjectures

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2019,（9）
• 页码范围: 1115-1120
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/0253-6102/71/9/1115

摘要

Recently proposed two swampland criteria that arising from string theory landscape leads 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 the swampland conjectures could be compatible with single-field inflationary scenariosif 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.