http://arxiv.org/abs/1707.05570
The aim of this paper is to probe the features of the bouncing progress that may take place in the early universe with the current observational data. Different from the normal parameterization based on inflation scenario, we study nonsingular bounce inflation models by taking into account the typical parameters that describe the bouncing process, such as the time and energy scales of the bounce. We consider two parameterized models of nonsingular bounce inflation scenario, one containing three phases while the other having two, and apply Markov Chain Monto Carlo analysis to determine the posterior distributions of the model parameters using the data combination of Planck 2015, BAO, and JLA. With the best fit values of the parameters, we plot the CMB TT power spectrum and show that the bounce inflation model can well explain the anomalies discovered by the Planck observation. Comparing the two-phase model and the three-phase model, we find that the two-phase model is more favored by the current observations. To precisely determine the details of the bounce and distinguish between the models, one needs more highly accurate observational data in the future.
S. Ni, H. Li, T. Qiu, et. al.
Wed, 19 Jul 17
49/58
Comments: 14 pages, 7 figures
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