2014/05/31 by Kui Xiao, Xiaokai He, Xiao-Kai He +2 · 8 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Inflation (cosmology) #Inflaton #Loop quantum cosmology #Metric expansion of space #Noncommutative and Quantum Gravity Theories #Phenomenology (philosophy) #Physics #Quantum #Quantum cosmology #Quantum gravity #Quantum mechanics #Scale factor (cosmology) #Slow roll #Tachyon #Theoretical physics #gr-qc
paper · pdf · doi:10.1142/s0218271814500874
published in International Journal of Modern Physics D 23(11), 1450087 (World Scientific) · 8 pages, 6 figures
openalex publication_date 2014/10/01 · arxiv created 2014/12/14 · arxiv updated 2014/12/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Assuming that the e-folding number is just determined by the change of the scale factor, the tachyonic inflation theory in loop quantum cosmology (LQC) has been discussed. Considering the tachyon field with exponential potential and inverse quadratic potential, we find that the evolutionary pictures of super inflation are affected by the potentials and the initial conditions. However it cannot provide enough e-folding number, no matter which condition is chosen. Therefore a slow-rolling inflation is necessary. The e-folding number for slow-rolling inflation depends on the values of the parameter α of the exponential potential and the initial conditions. To get enough e-folding number, α should be small. Based on the slow-rolling inflation happens immediately when the super inflation ends, and the scale factor continuously grows during the whole inflation stage, we consider an e-folding number provided by the whole inflationary stage, and we find that it is easier to get enough e-folding number when the scale factor increases during all the inflation phase.