G-bounce inflation: towards nonsingular inflation cosmology with galileon field

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Regular Article - Theoretical Physics


We study a nonsingular bounce inflation model, which can drive the early universe from a contracting phase, bounce into an ordinary inflationary phase, followed by the reheating process. Besides the bounce that avoided the Big-Bang singularity which appears in the standard cosmological scenario, we make use of the Horndesky theory and design the kinetic and potential forms of the lagrangian, so that neither of the two big problems in bouncing cosmology, namely the ghost and the anisotropy problems, will appear. The cosmological perturbations can be generated either in the contracting phase or in the inflationary phase, where in the latter the power spectrum will be scale-invariant and fit the observational data, while in the former the perturbations will have nontrivial features that will be tested by the large scale structure experiments. We also fit our model to the CMB TT power spectrum.


Classical Theories of Gravity Spacetime Singularities 


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Copyright information

© The Author(s) 2015

Authors and Affiliations

  1. 1.Institute of AstrophysicsCentral China Normal UniversityWuhanChina
  2. 2.State Key Laboratory of Theoretical Physics, Institute of Theoretical PhysicsChinese Academy of SciencesBeijingChina
  3. 3.School of PhysicsUniversity of Chinese Academy of SciencesBeijingChina

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