2015/02/28 by Jaume de Haro, Yi-Fu Cai · 3 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Context (archaeology) #Cosmology #Cosmology and Gravitation Theories #Current (fluid) #Equation of state #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Loop quantum cosmology #Physics #Planck #Quantum #Quantum cosmology #Quantum gravity #Quantum mechanics #Scalar (mathematics) #Scalar field #Theoretical physics #gr-qc
paper · pdf · doi:10.1007/s10714-015-1936-y
published as Gen. Rel. Grav 47 no 8 (2015) · Final version
openalex publication_date 2015/08/01 · arxiv created 2015/09/03 · arxiv updated 2015/09/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
As an alternative to the paradigm of slow roll inflation, we propose an extended scenario of the matter bounce cosmology in which the Universe has experienced a quasi-matter contracting phase with a variable background equation of state parameter. This extended matter bounce scenario can be realized by considering a single scalar field evolving along an approximately exponential potential. Our result reveals that the rolling of the scalar field in general leads to a running behavior on the spectral index of primordial cosmological perturbations and a negative running can be realized in this model. We constrain the corresponding parameter space by using the newly released Planck data. To apply this scenario, we revisit bouncing cosmologies within the context of modified gravity theories, in particular, the holonomy corrected loop quantum cosmology and teleparallel F(T) gravity. A gravitational process of reheating is presented in such a matter bounce scenario to demonstrate the condition of satisfying current observations. We also comment on several unresolved issues that often appear in matter bounce models.