Abstract
The Dirac-Born-Infeld (DBI) field theory in string theory is important and can provide the field of the universe’s inflation. At the same time, it provides a causal mechanism for generating the original density perturbation, thereby providing the necessary density perturbation for existing the dense and sparse matter distributions of the universe. We deduce a symmetric DBI action, introduce it into inflationary cosmology to calculate various inflation parameters, further calculate the scalar perturbation spectrum and the tensor-scalar ratio, which are compared with Planck + WMAP9 + BAO data, the power spectrum predicted by the new general DBI inflation theory satisfies the CMB Experiment constraints, i.e., is consistent with the current theories and experimental observations. Consequently, the theory of this paper conforms to current experiments and is supplying the current theories, and also a new way of explaining the inflation of the universe.
Highlights
In the very early stage of the universe, the initial value of the potential energy V (φ) of the inflation field φ was very large, and the potential energy curve was very flat
After we deduce the symmetric DBI action by string theory, we introduce it into inflationary cosmology to calculate various inflation parameters, and calculate the scalar perturbation spectrum and tensor-scalar ratio, further compare them with Planck + WMAP9 + BAO data to verify the correctness of the new general DBI action
The puzzle of the conversion of kinetic and potential energy in equal rights is the puzzle of the conversion, continuing to
Summary
In the very early stage of the universe, the initial value of the potential energy V (φ) of the inflation field φ was very large, and the potential energy curve was very flat. After we deduce the symmetric DBI action by string theory, we introduce it into inflationary cosmology to calculate various inflation parameters, and calculate the scalar perturbation spectrum and tensor-scalar ratio, further compare them with Planck + WMAP9 + BAO data to verify the correctness of the new general DBI action. Whether it conforms to the observational data and whether it will violate the prediction of the standard DBI action, we need to verify whether the symmetric DBI action can be driven by inflation and produce the vast universe we see now.
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