Title

Spinors, Inflation, and Non-Singular Cyclic Cosmologies

Author(s)/Creator(s)

Christian Armendariz-Picon, Department of Physics, Syracuse University, Syracuse, NYFollow
Patrick B. Greene, Fermi National Accelerator Laboratory

Document Type

Article

Date

1-20-2003

Language

English

Disciplines

Physics

Description/Abstract

We consider toy cosmological models in which a classical, homogeneous, spinor field provides a dominant or sub-dominant contribution to the energy-momentum tensor of a flat Friedmann-Robertson-Walker universe. We find that, if such a field were to exist, appropriate choices of the spinor self-interaction would generate a rich variety of behaviors, quite different from their widely studied scalar field counterparts. We first discuss solutions that incorporate a stage of cosmic inflation and estimate the primordial spectrum of density perturbations seeded during such a stage. Inflation driven by a spinor field turns out to be unappealing as it leads to a blue spectrum of perturbations and requires considerable fine-tuning of parameters. We next find that, for simple, quartic spinor self-interactions, non-singular cyclic cosmologies exist with reasonable parameter choices. These solutions might eventually be incorporated into a successful past- and future-eternal cosmological model free of singularities. In an Appendix, we discuss the classical treatment of spinors and argue that certain quantum systems might be approximated in terms of such fields.

Additional Information

12 two-column pages, 3 figures; uses RevTeX4 More information at http://arxiv.org/abs/hep-th/0301129

Recommended Citation

Armendariz-Picon, Christian and Greene, Patrick B., "Spinors, Inflation, and Non-Singular Cyclic Cosmologies" (2003). Physics - All Scholarship. 221.
https://surface.syr.edu/phy/221

Source

Harvested from Arxiv.org