Abstract
Within the scope of a FRW cosmological model we have studied the role of spinor field in the evolution of the Universe when it is non-minimally coupled to the gravitational one. We considered a few types of nonlinearity. It was found that if the spinor field nonlinearity describes an ordinary matter such as radiation, the presence of non-minimality becomes essential and leads to the rapid expansion of the Universe, whereas if the spinor field nonlinearity describes a dark energy, the evolution of the Universe is dominated by it and the difference between the minimal and non-minimally coupled cases becomes almost indistinguishable. Hence it should be argued that non-minimal coupling can be viewed as an alternative way to describe the accelerated mode of expansion of the Universe.
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Acknowledgements
The publication was prepared with the support of the “RUDN University Program 5-100” and also partly supported by a joint Romanian-JINR, Dubna Research Project, Order no. 396/27.05.2019 p-71.
I would also like to thank Dr. Dipen Bhattacharya for helping me improve the presentation.
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Saha, B. Non-minimally coupled nonlinear spinor field in FRW cosmology. Astrophys Space Sci 365, 68 (2020). https://doi.org/10.1007/s10509-020-03780-y
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DOI: https://doi.org/10.1007/s10509-020-03780-y